diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e78477554..14eda9ef5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -123,6 +123,12 @@ jobs:
       - name: Validate GitHub config
         run: pnpm run check:github-config
 
+      - name: Validate i18n contract
+        run: pnpm run i18n:contract:test
+
+      - name: Audit i18n resources
+        run: pnpm run i18n:audit
+
       - name: Lint web UI
         run: pnpm run lint:web
 
diff --git a/AGENTS-CN.md b/AGENTS-CN.md
index 295ecb6dd..4b711baf7 100644
--- a/AGENTS-CN.md
+++ b/AGENTS-CN.md
@@ -93,6 +93,8 @@ pnpm run desktop:build:nsis:fast      # Windows 安装器，release-fast profile
 - 不要把 Web UI locale 资源导入 `src/mobile-web`、`BitFun-Installer` 等较小形态。
 - Web UI 只急切加载 bootstrap namespace；路由或功能文案使用
   `useI18n(namespace)`，直接 `i18nService.t(...)` 只用于 bootstrap namespace。
+- `pnpm run i18n:audit` 会检查 key / 占位符一致性、直接静态 key 是否存在，以及
+  source 中不再新增硬编码 CJK 文案。
 
 ### 日志
 
diff --git a/AGENTS.md b/AGENTS.md
index cb303500a..a73ddcfa0 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -96,6 +96,8 @@ For the full script list, see [`package.json`](package.json).
 - Web UI loads only bootstrap namespaces eagerly; use `useI18n(namespace)` for
   route or feature copy and keep direct `i18nService.t(...)` calls in bootstrap
   namespaces.
+- `pnpm run i18n:audit` enforces key/placeholder parity, direct static key
+  existence, and the no-hardcoded-CJK source budget.
 
 ### Logging
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 327035495..0cf873ff4 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -86,6 +86,8 @@ Captured data is logged as structured JSON under the `bitfun::devtools` target.
   workflow copy in the owning surface.
 - Web UI route or feature copy should use `useI18n(namespace)`. Do not import
   Web UI locale catalogs into mobile-web, installer, backend, or static pages.
+- `pnpm run i18n:audit` enforces key/placeholder parity, direct static key
+  existence, and the no-hardcoded-CJK source budget.
 
 ### Platform-agnostic core
 
diff --git a/CONTRIBUTING_CN.md b/CONTRIBUTING_CN.md
index 4cf1cd362..d022c9a75 100644
--- a/CONTRIBUTING_CN.md
+++ b/CONTRIBUTING_CN.md
@@ -84,6 +84,8 @@ pnpm run e2e:test
   `pnpm run i18n:generate`。
 - 跨形态稳定标签放在 `src/shared/i18n/resources/shared`；流程文案留在所属形态资源中。
 - Web UI 路由或功能文案使用 `useI18n(namespace)`。不要把 Web UI locale 资源导入 mobile-web、installer、backend 或静态页面。
+- `pnpm run i18n:audit` 会检查 key / 占位符一致性、直接静态 key 是否存在，以及
+  source 中不再新增硬编码 CJK 文案。
 
 ### 平台无关核心
 
diff --git a/docs/architecture/i18n.md b/docs/architecture/i18n.md
index 531b7073f..db4284a51 100644
--- a/docs/architecture/i18n.md
+++ b/docs/architecture/i18n.md
@@ -78,11 +78,18 @@ to their current locale data.
   locale parsing, canonicalization, fallback order, and shared terms.
 - Relay static homepage is a self-contained static surface. It is tracked in the
   contract and audit baseline, but it does not import runtime locale catalogs.
+  Keep its static copy in its own resource file, such as
+  `src/apps/relay-server/static/homepage/i18n.json`, with English HTML fallback
+  text for first paint and fetch-failure resilience.
 
 Direct Web UI `i18nService.t('namespace:key')` calls are allowed only for
 bootstrap namespaces. Route, scene, and feature UI should use `useI18n(namespace)`
 so the namespace can be loaded on demand.
 
+Large or rarely used Web UI copy should live in a feature namespace outside
+`WEB_UI_BOOTSTRAP_NAMESPACES`; components load it with `useI18n(namespace)` or
+`useTranslation(namespace)` at the point of use.
+
 ## Backend And Frontend Language Contract
 
 All surfaces must exchange canonical app locale ids:
diff --git a/docs/development/i18n.md b/docs/development/i18n.md
index 199d295fd..8cf30c49f 100644
--- a/docs/development/i18n.md
+++ b/docs/development/i18n.md
@@ -104,9 +104,11 @@ to the relevant locale file instead. Literal fallback strings make audits and
 translation completeness harder to enforce.
 
 `pnpm run i18n:audit` fails on missing or extra keys in Web UI, mobile-web, and
-installer locale resources. It also fails if the checked-in CJK source candidate
-budgets grow. Existing budget warnings are grandfathered; new user-facing copy
-should be extracted instead of increasing the baseline.
+installer locale resources. It also fails on placeholder mismatches, unknown
+static Web UI `i18nService.t('namespace:key')` literals, direct `t(key,
+"literal fallback")` arguments, and CJK source candidates outside approved
+resource owners. Keep user-facing copy in locale/resource files rather than
+raising the hardcoded-copy baseline.
 
 ## Loading Size
 
@@ -118,6 +120,10 @@ Web UI eagerly loads only bootstrap namespaces and lazy-loads all other
 namespaces. Mobile Web, Installer, Backend, and static relay pages must not
 import Web UI locale catalogs to reuse copy.
 
+For large feature copy, create a dedicated lazy Web UI namespace instead of
+putting it in a bootstrap namespace. Static self-contained pages should keep
+their own small resource files and retain English fallback HTML.
+
 For bundle-sensitive changes, compare generated asset sizes before and after the
 change and include the result in the PR.
 
diff --git a/scripts/i18n-audit.mjs b/scripts/i18n-audit.mjs
index 013028982..1b8df0353 100644
--- a/scripts/i18n-audit.mjs
+++ b/scripts/i18n-audit.mjs
@@ -24,7 +24,9 @@ const mobileWebSourceDir = path.join(root, 'src', 'mobile-web', 'src');
 const mobileWebMessagesPath = path.join(mobileWebSourceDir, 'i18n', 'messages.ts');
 const installerSourceDir = path.join(root, 'BitFun-Installer', 'src');
 const installerLocalesDir = path.join(installerSourceDir, 'i18n', 'locales');
+const coreLocalesDir = path.join(root, 'src', 'crates', 'core', 'locales');
 const relayHomepageDir = path.join(root, 'src', 'apps', 'relay-server', 'static', 'homepage');
+const relayHomepageI18nPath = path.join(relayHomepageDir, 'i18n.json');
 const supportedLocales = fs
   .readdirSync(webLocalesDir, { withFileTypes: true })
   .filter((entry) => entry.isDirectory())
@@ -115,6 +117,54 @@ function flattenKeys(value, prefix = '') {
   return keys.sort();
 }
 
+function flattenStringEntries(value, prefix = '') {
+  if (typeof value === 'string') {
+    return prefix ? [[prefix, value]] : [];
+  }
+  if (Array.isArray(value)) {
+    const text = value.filter((item) => typeof item === 'string').join('\n');
+    return prefix ? [[prefix, text]] : [];
+  }
+  if (value == null || typeof value !== 'object') {
+    return prefix ? [[prefix, '']] : [];
+  }
+
+  return Object.entries(value)
+    .flatMap(([key, child]) => flattenStringEntries(child, prefix ? `${prefix}.${key}` : key))
+    .sort(([left], [right]) => left.localeCompare(right));
+}
+
+function sortedUnique(values) {
+  return Array.from(new Set(values)).sort();
+}
+
+function extractI18nextPlaceholders(value) {
+  const matches = String(value).matchAll(/\{\{\s*-?\s*([A-Za-z_][\w]*)\s*\}\}/g);
+  return sortedUnique(Array.from(matches, (match) => match[1]));
+}
+
+function extractMobilePlaceholders(value) {
+  const matches = String(value).matchAll(/\{\s*([A-Za-z_][\w]*)\s*\}/g);
+  return sortedUnique(Array.from(matches, (match) => match[1]));
+}
+
+function extractFluentPlaceholders(value) {
+  const matches = String(value).matchAll(/\$\s*([A-Za-z_][\w-]*)/g);
+  return sortedUnique(Array.from(matches, (match) => match[1]));
+}
+
+function sameSet(left, right) {
+  if (left.length !== right.length) return false;
+  return left.every((item, index) => item === right[index]);
+}
+
+function reportPlaceholderParity(surface, locale, key, expected, actual) {
+  if (sameSet(expected, actual)) return;
+  reportError(
+    `${surface} ${locale} key "${key}" placeholder mismatch: expected [${expected.join(', ')}], got [${actual.join(', ')}]`,
+  );
+}
+
 function readJsonKeys(locale, namespace) {
   const file = namespace === 'shared'
     ? path.join(sharedTermsDir, locale, 'terms.json')
@@ -127,6 +177,18 @@ function readJsonKeys(locale, namespace) {
   }
 }
 
+function readJsonEntries(locale, namespace) {
+  const file = namespace === 'shared'
+    ? path.join(sharedTermsDir, locale, 'terms.json')
+    : path.join(webLocalesDir, locale, `${namespace}.json`);
+  try {
+    return new Map(flattenStringEntries(readJsonFile(file)));
+  } catch (error) {
+    reportError(`Failed to parse ${toPosixPath(path.relative(root, file))}: ${error.message}`);
+    return new Map();
+  }
+}
+
 function readInstallerJsonKeys(uiLocale) {
   const file = path.join(installerLocalesDir, `${uiLocale}.json`);
   try {
@@ -137,6 +199,16 @@ function readInstallerJsonKeys(uiLocale) {
   }
 }
 
+function readInstallerJsonEntries(uiLocale) {
+  const file = path.join(installerLocalesDir, `${uiLocale}.json`);
+  try {
+    return new Map(flattenStringEntries(readJsonFile(file)));
+  } catch (error) {
+    reportError(`Failed to parse ${toPosixPath(path.relative(root, file))}: ${error.message}`);
+    return new Map();
+  }
+}
+
 function propertyNameToString(ts, name) {
   if (ts.isIdentifier(name) || ts.isStringLiteral(name) || ts.isNumericLiteral(name)) {
     return name.text;
@@ -173,7 +245,33 @@ function flattenTsObjectKeys(ts, objectLiteral, prefix = '') {
   return keys.sort();
 }
 
-function readMobileMessageKeysByLocale() {
+function flattenTsObjectEntries(ts, objectLiteral, prefix = '') {
+  const entries = [];
+  for (const property of objectLiteral.properties) {
+    if (!ts.isPropertyAssignment(property)) continue;
+
+    const key = propertyNameToString(ts, property.name);
+    if (!key) continue;
+    if (!prefix && key === 'shared') continue;
+
+    const nextPrefix = prefix ? `${prefix}.${key}` : key;
+    const initializer = unwrapTsExpression(ts, property.initializer);
+
+    if (ts.isObjectLiteralExpression(initializer)) {
+      entries.push(...flattenTsObjectEntries(ts, initializer, nextPrefix));
+    } else if (
+      ts.isStringLiteral(initializer) ||
+      ts.isNoSubstitutionTemplateLiteral(initializer)
+    ) {
+      entries.push([nextPrefix, initializer.text]);
+    } else {
+      entries.push([nextPrefix, '']);
+    }
+  }
+  return entries.sort(([left], [right]) => left.localeCompare(right));
+}
+
+function readMobileMessagesByLocale() {
   let ts;
   try {
     ts = require('typescript');
@@ -210,7 +308,7 @@ function readMobileMessageKeysByLocale() {
           continue;
         }
 
-        output.set(locale, flattenTsObjectKeys(ts, value));
+        output.set(locale, new Map(flattenTsObjectEntries(ts, value)));
       }
     }
     ts.forEachChild(node, visit);
@@ -220,6 +318,13 @@ function readMobileMessageKeysByLocale() {
   return output;
 }
 
+function readMobileMessageKeysByLocale() {
+  return new Map(
+    Array.from(readMobileMessagesByLocale().entries())
+      .map(([locale, entries]) => [locale, Array.from(entries.keys()).sort()]),
+  );
+}
+
 function diffSets(left, right) {
   const rightSet = new Set(right);
   return left.filter((item) => !rightSet.has(item));
@@ -386,6 +491,27 @@ function auditKeyParity(namespaces) {
   }
 }
 
+function auditWebI18nextPlaceholderParity(namespaces) {
+  for (const namespace of namespaces) {
+    const baselineEntries = readJsonEntries(baselineLocale, namespace);
+    const baselinePlaceholders = new Map(
+      Array.from(baselineEntries.entries()).map(([key, value]) => [
+        key,
+        extractI18nextPlaceholders(value),
+      ]),
+    );
+
+    for (const locale of supportedLocales.filter((item) => item !== baselineLocale)) {
+      const localeEntries = readJsonEntries(locale, namespace);
+      for (const [key, expected] of baselinePlaceholders.entries()) {
+        if (!localeEntries.has(key)) continue;
+        const actual = extractI18nextPlaceholders(localeEntries.get(key));
+        reportPlaceholderParity(`web-ui ${namespace}`, locale, key, expected, actual);
+      }
+    }
+  }
+}
+
 function auditMobileWebMessageParity() {
   const messagesByLocale = readMobileMessageKeysByLocale();
   const baselineKeys = messagesByLocale.get('en-US');
@@ -408,6 +534,31 @@ function auditMobileWebMessageParity() {
   }
 }
 
+function auditMobileWebPlaceholderParity() {
+  const messagesByLocale = readMobileMessagesByLocale();
+  const baselineEntries = messagesByLocale.get('en-US');
+  if (!baselineEntries) {
+    reportError('mobile-web messages are missing the en-US baseline locale');
+    return;
+  }
+
+  const baselinePlaceholders = new Map(
+    Array.from(baselineEntries.entries()).map(([key, value]) => [
+      key,
+      extractMobilePlaceholders(value),
+    ]),
+  );
+
+  for (const [locale, entries] of messagesByLocale.entries()) {
+    if (locale === 'en-US') continue;
+    for (const [key, expected] of baselinePlaceholders.entries()) {
+      if (!entries.has(key)) continue;
+      const actual = extractMobilePlaceholders(entries.get(key));
+      reportPlaceholderParity('mobile-web', locale, key, expected, actual);
+    }
+  }
+}
+
 function auditInstallerKeyParity() {
   const baselineKeys = readInstallerJsonKeys('en');
   for (const uiLocale of ['zh', 'zh-TW']) {
@@ -424,6 +575,162 @@ function auditInstallerKeyParity() {
   }
 }
 
+function auditInstallerPlaceholderParity() {
+  const baselineEntries = readInstallerJsonEntries('en');
+  const baselinePlaceholders = new Map(
+    Array.from(baselineEntries.entries()).map(([key, value]) => [
+      key,
+      extractI18nextPlaceholders(value),
+    ]),
+  );
+
+  for (const uiLocale of ['zh', 'zh-TW']) {
+    const entries = readInstallerJsonEntries(uiLocale);
+    for (const [key, expected] of baselinePlaceholders.entries()) {
+      if (!entries.has(key)) continue;
+      const actual = extractI18nextPlaceholders(entries.get(key));
+      reportPlaceholderParity('installer', uiLocale, key, expected, actual);
+    }
+  }
+}
+
+function readFluentMessages(localeId) {
+  const file = path.join(coreLocalesDir, `${localeId}.ftl`);
+  const messages = new Map();
+  let currentKey = null;
+  let currentLines = [];
+
+  function flushCurrent() {
+    if (currentKey) {
+      messages.set(currentKey, currentLines.join('\n'));
+    }
+    currentKey = null;
+    currentLines = [];
+  }
+
+  try {
+    const lines = fs.readFileSync(file, 'utf8').split(/\r?\n/);
+    for (const line of lines) {
+      const match = line.match(/^([A-Za-z][\w-]*)\s*=\s*(.*)$/);
+      if (match) {
+        flushCurrent();
+        currentKey = match[1];
+        currentLines = [match[2]];
+        continue;
+      }
+      if (currentKey && (/^\s+/.test(line) || line.trim().startsWith('*[') || line.trim().startsWith('['))) {
+        currentLines.push(line);
+      }
+    }
+    flushCurrent();
+  } catch (error) {
+    reportError(`Failed to parse ${toPosixPath(path.relative(root, file))}: ${error.message}`);
+  }
+
+  return messages;
+}
+
+function auditCoreFluentParity() {
+  const coreLocales = localeContract.surfaceOrders?.core ?? [];
+  const baselineCoreLocale = coreLocales.includes('en-US') ? 'en-US' : coreLocales[0];
+  const baselineEntries = readFluentMessages(baselineCoreLocale);
+  const baselineKeys = Array.from(baselineEntries.keys()).sort();
+  const baselinePlaceholders = new Map(
+    Array.from(baselineEntries.entries()).map(([key, value]) => [
+      key,
+      extractFluentPlaceholders(value),
+    ]),
+  );
+
+  for (const locale of coreLocales.filter((item) => item !== baselineCoreLocale)) {
+    const entries = readFluentMessages(locale);
+    const keys = Array.from(entries.keys()).sort();
+    for (const key of diffSets(baselineKeys, keys)) {
+      reportError(`core ${locale}.ftl is missing key "${key}"`);
+    }
+    for (const key of diffSets(keys, baselineKeys)) {
+      reportError(`core ${locale}.ftl has extra key "${key}"`);
+    }
+    for (const [key, expected] of baselinePlaceholders.entries()) {
+      if (!entries.has(key)) continue;
+      const actual = extractFluentPlaceholders(entries.get(key));
+      reportPlaceholderParity('core Fluent', locale, key, expected, actual);
+    }
+  }
+}
+
+function readRelayHomepageMessages() {
+  let resource;
+  try {
+    resource = readJsonFile(relayHomepageI18nPath);
+  } catch (error) {
+    reportError(`Failed to parse ${toPosixPath(path.relative(root, relayHomepageI18nPath))}: ${error.message}`);
+    return { localeIds: [], entriesByLocale: new Map() };
+  }
+
+  const entriesByLocale = new Map();
+  for (const [locale, messages] of Object.entries(resource)) {
+    entriesByLocale.set(locale, new Map(flattenStringEntries(messages)));
+  }
+
+  return {
+    localeIds: Object.keys(resource).sort(),
+    entriesByLocale,
+  };
+}
+
+function collectRelayHomepageDataKeys() {
+  const htmlPath = path.join(relayHomepageDir, 'index.html');
+  const html = fs.readFileSync(htmlPath, 'utf8');
+  return sortedUnique(Array.from(html.matchAll(/\bdata-i18n="([^"]+)"/g), (match) => match[1]));
+}
+
+function auditRelayStaticHomepageResources() {
+  const expectedLocaleIds = (localeContract.locales ?? []).map((locale) => locale.id).sort();
+  const { localeIds, entriesByLocale } = readRelayHomepageMessages();
+  const baselineLocaleId = expectedLocaleIds.includes('en-US') ? 'en-US' : expectedLocaleIds[0];
+  const baselineEntries = entriesByLocale.get(baselineLocaleId) ?? new Map();
+  const baselineKeys = Array.from(baselineEntries.keys()).sort();
+  const dataKeys = collectRelayHomepageDataKeys();
+
+  for (const locale of diffSets(expectedLocaleIds, localeIds)) {
+    reportError(`relay static homepage i18n.json is missing locale "${locale}"`);
+  }
+  for (const locale of diffSets(localeIds, expectedLocaleIds)) {
+    reportError(`relay static homepage i18n.json has non-canonical locale "${locale}"`);
+  }
+  for (const key of diffSets(dataKeys, baselineKeys)) {
+    reportError(`relay static homepage index.html references missing i18n key "${key}"`);
+  }
+  for (const key of diffSets(baselineKeys, dataKeys)) {
+    reportError(`relay static homepage i18n.json has unused baseline key "${key}"`);
+  }
+
+  const baselinePlaceholders = new Map(
+    Array.from(baselineEntries.entries()).map(([key, value]) => [
+      key,
+      extractI18nextPlaceholders(value),
+    ]),
+  );
+
+  for (const locale of expectedLocaleIds.filter((item) => item !== baselineLocaleId)) {
+    const entries = entriesByLocale.get(locale);
+    if (!entries) continue;
+    const keys = Array.from(entries.keys()).sort();
+    for (const key of diffSets(baselineKeys, keys)) {
+      reportError(`relay static homepage ${locale} messages are missing key "${key}"`);
+    }
+    for (const key of diffSets(keys, baselineKeys)) {
+      reportError(`relay static homepage ${locale} messages have extra key "${key}"`);
+    }
+    for (const [key, expected] of baselinePlaceholders.entries()) {
+      if (!entries.has(key)) continue;
+      const actual = extractI18nextPlaceholders(entries.get(key));
+      reportPlaceholderParity('relay static homepage', locale, key, expected, actual);
+    }
+  }
+}
+
 function shouldSkipSourceScan(file) {
   const normalized = toPosixPath(path.relative(root, file));
   return (
@@ -482,7 +789,63 @@ function auditSourceText() {
   }
 
   if (fallbackFindings.length > 0) {
-    reportWarning(`Found ${fallbackFindings.length} t(key, "literal fallback") candidate(s). First entries: ${fallbackFindings.slice(0, 12).join(', ')}`);
+    reportError(`Found ${fallbackFindings.length} t(key, "literal fallback") candidate(s). First entries: ${fallbackFindings.slice(0, 12).join(', ')}`);
+  }
+}
+
+function lineNumberAt(text, index) {
+  return text.slice(0, index).split(/\r?\n/).length;
+}
+
+function collectWebUiStaticTranslationKeys() {
+  const sourceFiles = listFiles(
+    webSourceDir,
+    (file) => (file.endsWith('.ts') || file.endsWith('.tsx')) && !shouldSkipSourceScan(file),
+  );
+  const output = [];
+  const patterns = [
+    /i18nService\.t\(\s*(['"`])([^'"`$]+?)\1/g,
+    /i18nService\.getT\(\)\(\s*(['"`])([^'"`$]+?)\1/g,
+  ];
+
+  for (const file of sourceFiles) {
+    const text = fs.readFileSync(file, 'utf8');
+    for (const pattern of patterns) {
+      for (const match of text.matchAll(pattern)) {
+        const key = match[2];
+        if (!key.includes(':')) continue;
+        output.push({
+          key,
+          location: `${toPosixPath(path.relative(root, file))}:${lineNumberAt(text, match.index ?? 0)}`,
+        });
+      }
+    }
+  }
+
+  return output;
+}
+
+function buildWebUiKeySet(namespaces) {
+  const keys = new Set();
+  for (const namespace of namespaces) {
+    for (const key of readJsonKeys(baselineLocale, namespace)) {
+      keys.add(`${namespace}:${key}`);
+    }
+  }
+  return keys;
+}
+
+function auditWebUiStaticTranslationKeys(namespaces) {
+  const knownKeys = buildWebUiKeySet(namespaces);
+  const missing = collectWebUiStaticTranslationKeys()
+    .filter(({ key }) => !knownKeys.has(key));
+
+  if (missing.length > 0) {
+    reportError(
+      `Found ${missing.length} unknown static Web UI i18n key(s). First entries: ${
+        missing.slice(0, 12).map(({ key, location }) => `${location} ${key}`).join(', ')
+      }`,
+    );
   }
 }
 
@@ -555,8 +918,14 @@ auditMobileWebBoundary();
 
 const namespaces = auditNamespaceCoverage();
 auditKeyParity(namespaces);
+auditWebI18nextPlaceholderParity(namespaces);
+auditWebUiStaticTranslationKeys(namespaces);
 auditMobileWebMessageParity();
+auditMobileWebPlaceholderParity();
 auditInstallerKeyParity();
+auditInstallerPlaceholderParity();
+auditCoreFluentParity();
+auditRelayStaticHomepageResources();
 auditSourceText();
 auditHardcodedSourceBudgets();
 
diff --git a/scripts/i18n-contract.test.mjs b/scripts/i18n-contract.test.mjs
index 392a6936a..d2d4456d5 100644
--- a/scripts/i18n-contract.test.mjs
+++ b/scripts/i18n-contract.test.mjs
@@ -225,6 +225,40 @@ test('i18n audit treats locale key parity as an error', () => {
   assert.match(auditSource, /auditInstallerKeyParity/, 'installer locale keys should be covered by i18n:audit');
 });
 
+test('CI runs i18n contract and audit guards before frontend builds', () => {
+  const ciSource = readText('.github/workflows/ci.yml');
+  const contractIndex = ciSource.indexOf('pnpm run i18n:contract:test');
+  const auditIndex = ciSource.indexOf('pnpm run i18n:audit');
+  const buildIndex = ciSource.indexOf('pnpm run build:web');
+
+  assert.notEqual(contractIndex, -1, 'CI should run pnpm run i18n:contract:test');
+  assert.notEqual(auditIndex, -1, 'CI should run pnpm run i18n:audit');
+  assert.ok(contractIndex < buildIndex, 'i18n contract checks should run before web build');
+  assert.ok(auditIndex < buildIndex, 'i18n audit should run before web build');
+});
+
+test('i18n audit enforces interpolation parameter parity across resource formats', () => {
+  const auditSource = readText('scripts/i18n-audit.mjs');
+
+  assert.match(auditSource, /auditWebI18nextPlaceholderParity/, 'Web UI JSON placeholders should be audited');
+  assert.match(auditSource, /auditMobileWebPlaceholderParity/, 'mobile-web placeholders should be audited');
+  assert.match(auditSource, /auditInstallerPlaceholderParity/, 'installer placeholders should be audited');
+  assert.match(auditSource, /auditCoreFluentParity/, 'core Fluent keys and placeholders should be audited');
+  assert.match(auditSource, /auditRelayStaticHomepageResources/, 'relay static homepage resources should be audited');
+  assert.match(auditSource, /extractI18nextPlaceholders/, 'i18next placeholder extraction should be explicit');
+  assert.match(auditSource, /extractMobilePlaceholders/, 'mobile placeholder extraction should be explicit');
+  assert.match(auditSource, /extractFluentPlaceholders/, 'Fluent placeholder extraction should be explicit');
+});
+
+test('i18n audit fails literal fallbacks and unknown static keys', () => {
+  const auditSource = readText('scripts/i18n-audit.mjs');
+  const sourceTextAudit = auditSource.match(/function auditSourceText\(\) \{[\s\S]*?\n\}/)?.[0] ?? '';
+
+  assert.match(sourceTextAudit, /reportError/, 'literal t(key, "fallback") candidates should fail audit');
+  assert.match(auditSource, /auditWebUiStaticTranslationKeys/, 'static Web UI translation keys should be checked');
+  assert.match(auditSource, /collectWebUiStaticTranslationKeys/, 'static key collection should be explicit');
+});
+
 test('installer Rust locale contract is generated from the installer surface order', () => {
   const generatorSource = readText('scripts/generate-i18n-contract.mjs');
   const installerRustGenerator = generatorSource.match(/function generateInstallerRustLocaleContract\(contract\) \{[\s\S]*?\n\}/)?.[0] ?? '';
diff --git a/scripts/i18n-hardcoded-baseline.json b/scripts/i18n-hardcoded-baseline.json
index 07ea3d120..8f3c7d67e 100644
--- a/scripts/i18n-hardcoded-baseline.json
+++ b/scripts/i18n-hardcoded-baseline.json
@@ -3,11 +3,11 @@
   "budgets": [
     {
       "id": "web-ui-source",
-      "maxCjkLines": 198
+      "maxCjkLines": 0
     },
     {
       "id": "mobile-web-source",
-      "maxCjkLines": 8
+      "maxCjkLines": 0
     },
     {
       "id": "installer-source",
@@ -15,7 +15,7 @@
     },
     {
       "id": "relay-static-homepage",
-      "maxCjkLines": 17
+      "maxCjkLines": 0
     }
   ]
 }
diff --git a/src/apps/relay-server/static/homepage/i18n.json b/src/apps/relay-server/static/homepage/i18n.json
new file mode 100644
index 000000000..431d462b8
--- /dev/null
+++ b/src/apps/relay-server/static/homepage/i18n.json
@@ -0,0 +1,53 @@
+{
+  "zh-CN": {
+    "languageToggle": "语言：简体",
+    "status": "服务运行中",
+    "desc": "桌面端与移动端之间的中继服务，提供配对与消息转发能力。",
+    "f1t": "建立连接",
+    "f1d": "承接配对请求，建立远程会话。",
+    "f2t": "消息转发",
+    "f2d": "桥接 WebSocket 与 HTTP 双向通信。",
+    "f3t": "自托管友好",
+    "f3d": "私有部署、自定义域名与反向代理。",
+    "flowDesktop": "桌面端",
+    "flowDesktopSub": "BitFun Agent",
+    "flowRelay": "中继服务",
+    "flowRelaySub": "配对 & 转发",
+    "flowMobile": "移动端",
+    "flowMobileSub": "远程控制"
+  },
+  "zh-TW": {
+    "languageToggle": "語言：繁體",
+    "status": "服務運行中",
+    "desc": "桌面端與移動端之間的中繼服務，提供配對與消息轉發能力。",
+    "f1t": "建立連接",
+    "f1d": "承接配對請求，建立遠程會話。",
+    "f2t": "消息轉發",
+    "f2d": "橋接 WebSocket 與 HTTP 雙向通信。",
+    "f3t": "自託管友好",
+    "f3d": "私有部署、自定義域名與反向代理。",
+    "flowDesktop": "桌面端",
+    "flowDesktopSub": "BitFun Agent",
+    "flowRelay": "中繼服務",
+    "flowRelaySub": "配對 & 轉發",
+    "flowMobile": "移動端",
+    "flowMobileSub": "遠程控制"
+  },
+  "en-US": {
+    "languageToggle": "Language: EN",
+    "status": "Service Running",
+    "desc": "Relay service between desktop and mobile, enabling pairing and message forwarding.",
+    "f1t": "Connect",
+    "f1d": "Handle pairing requests, create remote sessions.",
+    "f2t": "Relay",
+    "f2d": "Bridge WebSocket and HTTP bidirectionally.",
+    "f3t": "Self-Host",
+    "f3d": "Private deploy, custom domains and reverse proxy.",
+    "flowDesktop": "Desktop",
+    "flowDesktopSub": "BitFun Agent",
+    "flowRelay": "Relay Server",
+    "flowRelaySub": "Pair and Forward",
+    "flowMobile": "Mobile",
+    "flowMobileSub": "Remote Control"
+  }
+}
diff --git a/src/apps/relay-server/static/homepage/index.html b/src/apps/relay-server/static/homepage/index.html
index 1a5b656f4..a0ab330a3 100644
--- a/src/apps/relay-server/static/homepage/index.html
+++ b/src/apps/relay-server/static/homepage/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="zh-CN">
+<html lang="en-US">
 <head>
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
@@ -156,10 +156,10 @@
         <span class="brand-name">BitFun Relay Server</span>
       </div>
       <div class="nav-right">
-        <button class="lang-btn" id="langToggle" type="button" aria-label="Switch language">中 / EN</button>
+        <button class="lang-btn" id="langToggle" type="button" aria-label="Switch language" data-i18n="languageToggle">Language: EN</button>
         <div class="status-pill">
           <span class="status-dot" aria-hidden="true"></span>
-          <span data-i18n="status">服务运行中</span>
+          <span data-i18n="status">Service Running</span>
         </div>
       </div>
     </nav>
@@ -168,7 +168,7 @@
       <section class="hero">
         <img class="hero-logo" src="https://openbitfun.com/Logo-ICON.png" alt="BitFun Logo" />
         <h1><span class="grad">BitFun</span> Relay Server</h1>
-        <p class="hero-sub" data-i18n="desc">桌面端与移动端之间的中继服务，提供配对与消息转发能力。</p>
+        <p class="hero-sub" data-i18n="desc">Relay service between desktop and mobile, enabling pairing and message forwarding.</p>
         <div class="cta">
           <a class="btn btn-primary" href="https://openbitfun.com/" target="_blank" rel="noreferrer">
             <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><path d="M2 12h20"/><path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z"/></svg>
@@ -186,7 +186,7 @@ <h1><span class="grad">BitFun</span> Relay Server</h1>
           <div class="flow-circle">
             <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2" ry="2"/><line x1="8" y1="21" x2="16" y2="21"/><line x1="12" y1="17" x2="12" y2="21"/></svg>
           </div>
-          <span class="flow-label" data-i18n="flowDesktop">桌面端</span>
+          <span class="flow-label" data-i18n="flowDesktop">Desktop</span>
           <span class="flow-sublabel" data-i18n="flowDesktopSub">BitFun Agent</span>
         </div>
         <div class="flow-arrow"><span class="flow-arrow-label">WebSocket</span></div>
@@ -194,16 +194,16 @@ <h1><span class="grad">BitFun</span> Relay Server</h1>
           <div class="flow-circle">
             <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><polyline points="16 3 21 3 21 8"/><line x1="4" y1="20" x2="21" y2="3"/><polyline points="21 16 21 21 16 21"/><line x1="15" y1="15" x2="21" y2="21"/><line x1="4" y1="4" x2="9" y2="9"/></svg>
           </div>
-          <span class="flow-label" data-i18n="flowRelay">中继服务</span>
-          <span class="flow-sublabel" data-i18n="flowRelaySub">配对 & 转发</span>
+          <span class="flow-label" data-i18n="flowRelay">Relay Server</span>
+          <span class="flow-sublabel" data-i18n="flowRelaySub">Pair and Forward</span>
         </div>
         <div class="flow-arrow"><span class="flow-arrow-label">HTTP</span></div>
         <div class="flow-node">
           <div class="flow-circle">
             <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><rect x="5" y="2" width="14" height="20" rx="2" ry="2"/><line x1="12" y1="18" x2="12.01" y2="18"/></svg>
           </div>
-          <span class="flow-label" data-i18n="flowMobile">移动端</span>
-          <span class="flow-sublabel" data-i18n="flowMobileSub">远程控制</span>
+          <span class="flow-label" data-i18n="flowMobile">Mobile</span>
+          <span class="flow-sublabel" data-i18n="flowMobileSub">Remote Control</span>
         </div>
       </div>
 
@@ -211,23 +211,23 @@ <h1><span class="grad">BitFun</span> Relay Server</h1>
         <article class="feat">
           <div class="feat-head">
             <div class="feat-icon blue"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M15 7h3a5 5 0 0 1 5 5 5 5 0 0 1-5 5h-3m-6 0H6a5 5 0 0 1-5-5 5 5 0 0 1 5-5h3"/><line x1="8" y1="12" x2="16" y2="12"/></svg></div>
-            <h3 data-i18n="f1t">建立连接</h3>
+            <h3 data-i18n="f1t">Connect</h3>
           </div>
-          <p data-i18n="f1d">承接配对请求，建立远程会话。</p>
+          <p data-i18n="f1d">Handle pairing requests, create remote sessions.</p>
         </article>
         <article class="feat">
           <div class="feat-head">
             <div class="feat-icon green"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="16 3 21 3 21 8"/><line x1="4" y1="20" x2="21" y2="3"/><polyline points="21 16 21 21 16 21"/><line x1="15" y1="15" x2="21" y2="21"/><line x1="4" y1="4" x2="9" y2="9"/></svg></div>
-            <h3 data-i18n="f2t">消息转发</h3>
+            <h3 data-i18n="f2t">Relay</h3>
           </div>
-          <p data-i18n="f2d">桥接 WebSocket 与 HTTP 双向通信。</p>
+          <p data-i18n="f2d">Bridge WebSocket and HTTP bidirectionally.</p>
         </article>
         <article class="feat">
           <div class="feat-head">
             <div class="feat-icon slate"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="2" width="20" height="8" rx="2" ry="2"/><rect x="2" y="14" width="20" height="8" rx="2" ry="2"/><line x1="6" y1="6" x2="6.01" y2="6"/><line x1="6" y1="18" x2="6.01" y2="18"/></svg></div>
-            <h3 data-i18n="f3t">自托管友好</h3>
+            <h3 data-i18n="f3t">Self-Host</h3>
           </div>
-          <p data-i18n="f3d">私有部署、自定义域名与反向代理。</p>
+          <p data-i18n="f3d">Private deploy, custom domains and reverse proxy.</p>
         </article>
       </div>
     </main>
@@ -236,18 +236,14 @@ <h3 data-i18n="f3t">自托管友好</h3>
   </div>
 
   <script>
-    var I={
-      zh:{status:'服务运行中',desc:'桌面端与移动端之间的中继服务，提供配对与消息转发能力。',
-        f1t:'建立连接',f1d:'承接配对请求，建立远程会话。',f2t:'消息转发',f2d:'桥接 WebSocket 与 HTTP 双向通信。',f3t:'自托管友好',f3d:'私有部署、自定义域名与反向代理。',
-        flowDesktop:'桌面端',flowDesktopSub:'BitFun Agent',flowRelay:'中继服务',flowRelaySub:'配对 & 转发',flowMobile:'移动端',flowMobileSub:'远程控制'},
-      en:{status:'Service Running',desc:'Relay service between desktop and mobile, enabling pairing and message forwarding.',
-        f1t:'Connect',f1d:'Handle pairing requests, create remote sessions.',f2t:'Relay',f2d:'Bridge WebSocket and HTTP bidirectionally.',f3t:'Self-Host',f3d:'Private deploy, custom domains & reverse proxy.',
-        flowDesktop:'Desktop',flowDesktopSub:'BitFun Agent',flowRelay:'Relay Server',flowRelaySub:'Pair & Forward',flowMobile:'Mobile',flowMobileSub:'Remote Control'}
-    };
-    var L=(navigator.language||'').startsWith('zh')?'zh':'en';
-    function set(l){L=l;document.documentElement.lang=l==='zh'?'zh-CN':'en';var s=I[l];document.querySelectorAll('[data-i18n]').forEach(function(e){var k=e.getAttribute('data-i18n');if(s[k])e.textContent=s[k]})}
-    document.getElementById('langToggle').addEventListener('click',function(){set(L==='zh'?'en':'zh')});
-    set(L);
+    var I={'en-US':{languageToggle:'Language: EN',status:'Service Running',desc:'Relay service between desktop and mobile, enabling pairing and message forwarding.',f1t:'Connect',f1d:'Handle pairing requests, create remote sessions.',f2t:'Relay',f2d:'Bridge WebSocket and HTTP bidirectionally.',f3t:'Self-Host',f3d:'Private deploy, custom domains and reverse proxy.',flowDesktop:'Desktop',flowDesktopSub:'BitFun Agent',flowRelay:'Relay Server',flowRelaySub:'Pair and Forward',flowMobile:'Mobile',flowMobileSub:'Remote Control'}};
+    var LOCALES=['en-US','zh-CN','zh-TW'];
+    function resolveLocale(){var l=(navigator.language||'').toLowerCase();if(l==='zh-tw'||l.startsWith('zh-hant'))return'zh-TW';if(l.startsWith('zh'))return'zh-CN';return'en-US'}
+    function nextLocale(l){var i=LOCALES.indexOf(l);return LOCALES[(i+1)%LOCALES.length]||'en-US'}
+    var L=resolveLocale();
+    function set(l){L=l;var effective=I[l]?l:'en-US';document.documentElement.lang=effective;var s=I[effective];document.querySelectorAll('[data-i18n]').forEach(function(e){var k=e.getAttribute('data-i18n');if(s[k])e.textContent=s[k]})}
+    document.getElementById('langToggle').addEventListener('click',function(){set(nextLocale(L))});
+    fetch('i18n.json').then(function(r){return r.ok?r.json():null}).then(function(r){if(r){I=r}set(L)}).catch(function(){set(L)});
   </script>
 </body>
 </html>
diff --git a/src/mobile-web/src/App.tsx b/src/mobile-web/src/App.tsx
index 92674d931..6aa278361 100644
--- a/src/mobile-web/src/App.tsx
+++ b/src/mobile-web/src/App.tsx
@@ -81,7 +81,7 @@ const AppContent: React.FC = () => {
 
   useEffect(() => () => clearTimeout(timerRef.current), []);
 
-  // 全局链接点击处理 - 确保所有外部链接在新标签页打开
+  // Open external links in a new tab from anywhere in the app.
   useEffect(() => {
     const handleLinkClick = (e: MouseEvent) => {
       const target = e.target as HTMLElement;
@@ -89,7 +89,7 @@ const AppContent: React.FC = () => {
       
       if (link && link.href) {
         const href = link.href;
-        // 检查是否是外部链接 (http/https 且不是当前域名)
+        // Treat all http(s) links as external for the mobile web shell.
         if (href.startsWith('http://') || href.startsWith('https://')) {
           e.preventDefault();
           e.stopPropagation();
@@ -98,7 +98,7 @@ const AppContent: React.FC = () => {
       }
     };
     
-    // 添加全局点击监听
+    // Capture link clicks before nested content handles them.
     document.addEventListener('click', handleLinkClick, true);
     
     return () => {
diff --git a/src/mobile-web/src/i18n/messages.ts b/src/mobile-web/src/i18n/messages.ts
index 27de53f75..803faa409 100644
--- a/src/mobile-web/src/i18n/messages.ts
+++ b/src/mobile-web/src/i18n/messages.ts
@@ -327,7 +327,7 @@ export const messages: Record<MobileLanguage, MessageTree> = {
       modelPrimary: 'Primary 模型',
       modelFast: 'Fast 模型',
       modelNotConfigured: '模型未配置',
-      askQuestionCount: '{count} 个问题',
+      askQuestionCount: '{count} 个问题{suffix}',
       waiting: '等待中',
       modeAgentic: 'Agentic',
       modePlan: 'Plan',
@@ -335,7 +335,7 @@ export const messages: Record<MobileLanguage, MessageTree> = {
       thinking: '思考中...',
       allTasksCompleted: '所有任务已完成',
       task: '任务',
-      toolCalls: '{count} 次工具调用',
+      toolCalls: '{count} 次工具调用{suffix}',
       done: '已完成 {count}',
       running: '运行中 {count}',
       thoughtCharacters: '思考 {count} 个字符',
@@ -509,7 +509,7 @@ export const messages: Record<MobileLanguage, MessageTree> = {
       modelPrimary: 'Primary 模型',
       modelFast: 'Fast 模型',
       modelNotConfigured: '模型未配置',
-      askQuestionCount: '{count} 個問題',
+      askQuestionCount: '{count} 個問題{suffix}',
       waiting: '等待中',
       modeAgentic: 'Agentic',
       modePlan: 'Plan',
@@ -517,7 +517,7 @@ export const messages: Record<MobileLanguage, MessageTree> = {
       thinking: '思考中...',
       allTasksCompleted: '所有任務已完成',
       task: '任務',
-      toolCalls: '{count} 次工具調用',
+      toolCalls: '{count} 次工具調用{suffix}',
       done: '已完成 {count}',
       running: '運行中 {count}',
       thoughtCharacters: '思考 {count} 個字符',
diff --git a/src/mobile-web/src/pages/ChatPage.tsx b/src/mobile-web/src/pages/ChatPage.tsx
index 1705ba843..34f7ab0e1 100644
--- a/src/mobile-web/src/pages/ChatPage.tsx
+++ b/src/mobile-web/src/pages/ChatPage.tsx
@@ -4,6 +4,7 @@ import remarkGfm from 'remark-gfm';
 import { Prism as SyntaxHighlighter } from 'react-syntax-highlighter';
 import { vscDarkPlus, vs } from 'react-syntax-highlighter/dist/esm/styles/prism';
 import { useI18n } from '../i18n';
+import { messages } from '../i18n/messages';
 import {
   RemoteSessionManager,
   SessionPoller,
@@ -33,6 +34,10 @@ function formatDuration(ms: number): string {
   return `${(ms / 1000).toFixed(1)}s`;
 }
 
+function getEnglishPluralSuffix(language: string, count: number): string {
+  return language === 'en-US' && count !== 1 ? 's' : '';
+}
+
 function truncateMiddle(str: string, maxLen: number): string {
   if (!str || str.length <= maxLen) return str;
   const keep = maxLen - 3;
@@ -151,7 +156,7 @@ function normalizeFileLikeHref(rawHref: string): string {
     }
   }
 
-  // Normalize URI-like Windows absolute paths such as `/C:/Users/...`.
+  // Normalize URI-like Windows absolute paths with a leading slash before the drive letter.
   if (/^\/[A-Za-z]:[\\/]/.test(filePath)) {
     filePath = filePath.slice(1);
   }
@@ -474,7 +479,7 @@ const MarkdownContent: React.FC<MarkdownContentProps> = ({ content, onFileDownlo
       // Fallback: render as plain text for computer:// links without handler,
       // or as a regular link for http(s) links.
       if (typeof href === 'string') {
-        // 所有外部链接都在新标签页打开
+        // Open all external links in a new tab.
         const isExternalLink = href.startsWith('http://') || href.startsWith('https://');
         if (isExternalLink) {
           return (
@@ -745,7 +750,7 @@ const TaskToolCard: React.FC<{
   subItems?: ChatMessageItem[];
   onCancelTool?: (toolId: string) => void;
 }> = ({ tool, now, subItems = [], onCancelTool }) => {
-  const { t } = useI18n();
+  const { t, language } = useI18n();
   const scrollRef = useRef<HTMLDivElement>(null);
   const prevCountRef = useRef(0);
   const [stepsExpanded, setStepsExpanded] = useState(false);
@@ -818,7 +823,7 @@ const TaskToolCard: React.FC<{
         <>
           <div className="chat-task-card__summary" onClick={() => setStepsExpanded(e => !e)}>
             <span className="chat-task-card__stat">
-              {t('chat.toolCalls', { count: subTools.length, suffix: subTools.length === 1 ? '' : 's' })}
+              {t('chat.toolCalls', { count: subTools.length, suffix: getEnglishPluralSuffix(language, subTools.length) })}
             </span>
             <span className="chat-task-card__stat-right">
               <span className="chat-task-card__stat--done">{t('chat.done', { count: subToolsDone })}</span>
@@ -1081,7 +1086,7 @@ const ToolList: React.FC<{
   now: number;
   onCancelTool?: (toolId: string) => void;
 }> = ({ tools, now, onCancelTool }) => {
-  const { t } = useI18n();
+  const { t, language } = useI18n();
   const scrollRef = useRef<HTMLDivElement>(null);
   const prevCountRef = useRef(0);
   const [expanded, setExpanded] = useState(false);
@@ -1111,7 +1116,7 @@ const ToolList: React.FC<{
   return (
     <div className="chat-tool-list chat-tool-list--collapsed">
       <div className="chat-tool-list__header" onClick={() => setExpanded(e => !e)}>
-        <span className="chat-tool-list__count">{t('chat.toolCalls', { count: tools.length, suffix: tools.length === 1 ? '' : 's' })}</span>
+        <span className="chat-tool-list__count">{t('chat.toolCalls', { count: tools.length, suffix: getEnglishPluralSuffix(language, tools.length) })}</span>
         <span className="chat-tool-list__stats">
           {doneCount > 0 && <span className="chat-tool-list__stat chat-tool-list__stat--done">{t('chat.done', { count: doneCount })}</span>}
           {runningCount > 0 && <span className="chat-tool-list__stat chat-tool-list__stat--running">{t('chat.running', { count: runningCount })}</span>}
@@ -1224,13 +1229,35 @@ const isPendingAskUserQuestion = (tool?: RemoteToolStatus | null) => {
   return !['completed', 'failed', 'cancelled', 'rejected'].includes(tool.status);
 };
 
-const isOtherQuestionOption = (label?: string) => {
+function getMessageByPath(source: unknown, path: string): string | null {
+  const segments = path.split('.');
+  let current: unknown = source;
+
+  for (const segment of segments) {
+    if (!current || typeof current !== 'object' || !(segment in current)) {
+      return null;
+    }
+    current = (current as Record<string, unknown>)[segment];
+  }
+
+  return typeof current === 'string' ? current : null;
+}
+
+const OTHER_QUESTION_OPTION_LABELS = new Set([
+  'other',
+  ...Object.values(messages)
+    .map((localeMessages) => getMessageByPath(localeMessages, 'common.other'))
+    .filter((label): label is string => !!label)
+    .map((label) => label.trim().toLowerCase()),
+]);
+
+const isOtherQuestionOption = (label: string | undefined) => {
   const normalized = (label || '').trim().toLowerCase();
-  return normalized === 'other' || normalized === '其他';
+  return OTHER_QUESTION_OPTION_LABELS.has(normalized);
 };
 
 const AskQuestionCard: React.FC<AskQuestionCardProps> = ({ tool, onAnswer }) => {
-  const { t } = useI18n();
+  const { t, language } = useI18n();
   const questions: any[] = tool.tool_input?.questions || [];
   const [selected, setSelected] = useState<Record<number, string | string[]>>({});
   const [customTexts, setCustomTexts] = useState<Record<number, string>>({});
@@ -1295,7 +1322,7 @@ const AskQuestionCard: React.FC<AskQuestionCardProps> = ({ tool, onAnswer }) =>
   return (
     <div className="chat-ask-card">
       <div className="chat-ask-card__header">
-        <span className="chat-ask-card__count">{t('chat.askQuestionCount', { count: questions.length, suffix: questions.length > 1 ? 's' : '' })}</span>
+        <span className="chat-ask-card__count">{t('chat.askQuestionCount', { count: questions.length, suffix: getEnglishPluralSuffix(language, questions.length) })}</span>
         {!submitted && !submitting && (
           <span className="chat-ask-card__waiting">{t('chat.waiting')}</span>
         )}
diff --git a/src/mobile-web/src/services/RemoteSessionManager.ts b/src/mobile-web/src/services/RemoteSessionManager.ts
index 1e760dab2..34de29144 100644
--- a/src/mobile-web/src/services/RemoteSessionManager.ts
+++ b/src/mobile-web/src/services/RemoteSessionManager.ts
@@ -514,7 +514,7 @@ export class SessionPoller {
   private getInterval(): number {
     if (document.visibilityState !== 'visible') return 5000;
     
-    // 如果在宽限期内（turn 刚刚结束），继续保持快速轮询
+    // Keep fast polling during the short grace period after a turn ends.
     const now = Date.now();
     if (this.turnJustEndedAt != null && (now - this.turnJustEndedAt) < this.TURN_JUST_ENDED_GRACE_PERIOD_MS) {
       return 1000;
@@ -560,12 +560,12 @@ export class SessionPoller {
         const isActiveNow = resp.active_turn != null && resp.active_turn.status === 'active';
         this.hasActiveTurn = isActiveNow;
         
-        // 检测到 active_turn 刚刚结束，设置宽限期
+        // Start the grace period when active_turn just ended.
         if (wasActive && !isActiveNow) {
           this.turnJustEndedAt = Date.now();
         }
         
-        // 如果有新消息或者 active_turn 仍然活跃，重置宽限期
+        // Clear the grace period once new messages arrive.
         if (resp.new_messages && resp.new_messages.length > 0) {
           this.turnJustEndedAt = null;
         }
diff --git a/src/web-ui/src/app/scenes/settings/SettingsNav.tsx b/src/web-ui/src/app/scenes/settings/SettingsNav.tsx
index 27b25e455..b5a9f6751 100644
--- a/src/web-ui/src/app/scenes/settings/SettingsNav.tsx
+++ b/src/web-ui/src/app/scenes/settings/SettingsNav.tsx
@@ -28,6 +28,7 @@ import { SETTINGS_TAB_SEARCH_CONTENT } from './settingsTabSearchContent';
 import './SettingsNav.scss';
 
 const SEARCH_DEBOUNCE_MS = 150;
+type SettingsT = (key: string, options?: Record<string, unknown>) => unknown;
 
 export interface SettingsSearchRow {
   tabId: ConfigTab;
@@ -53,21 +54,37 @@ function resolveTabPageContentHaystack(i18n: I18nApi, tabId: ConfigTab): string
   return parts.join(' ');
 }
 
+function translateString(t: SettingsT, key: string, defaultValue: string): string {
+  const value = t(key, { defaultValue });
+  return typeof value === 'string' ? value : defaultValue;
+}
+
+function readSearchAliases(t: SettingsT, tabId: ConfigTab): string[] {
+  const aliases = t(`configCenter.searchAliases.${tabId}`, {
+    defaultValue: [],
+    returnObjects: true,
+  });
+  return Array.isArray(aliases)
+    ? aliases.filter((alias): alias is string => typeof alias === 'string')
+    : [];
+}
+
 function buildSettingsSearchIndex(
-  t: (key: string, options?: Record<string, unknown>) => string,
+  t: SettingsT,
   i18n: I18nApi
 ): SettingsSearchRow[] {
   const rows: SettingsSearchRow[] = [];
   for (const cat of SETTINGS_CATEGORIES) {
-    const categoryLabel = t(cat.nameKey, { defaultValue: cat.id });
+    const categoryLabel = translateString(t, cat.nameKey, cat.id);
     for (const tabDef of cat.tabs) {
-      const tabLabel = t(tabDef.labelKey, { defaultValue: tabDef.id });
+      const tabLabel = translateString(t, tabDef.labelKey, tabDef.id);
       const description = tabDef.descriptionKey
-        ? t(tabDef.descriptionKey, { defaultValue: '' })
+        ? translateString(t, tabDef.descriptionKey, '')
         : '';
       const kw = (tabDef.keywords ?? []).join(' ');
+      const aliases = readSearchAliases(t, tabDef.id).join(' ');
       const pageContent = resolveTabPageContentHaystack(i18n, tabDef.id);
-      const haystack = [categoryLabel, tabLabel, description, kw, tabDef.id, pageContent]
+      const haystack = [categoryLabel, tabLabel, description, kw, aliases, tabDef.id, pageContent]
         .join(' ')
         .toLowerCase();
       rows.push({
diff --git a/src/web-ui/src/app/scenes/settings/settingsConfig.ts b/src/web-ui/src/app/scenes/settings/settingsConfig.ts
index b3f810bb2..f1ad68eb1 100644
--- a/src/web-ui/src/app/scenes/settings/settingsConfig.ts
+++ b/src/web-ui/src/app/scenes/settings/settingsConfig.ts
@@ -107,8 +107,6 @@ export const SETTINGS_CATEGORIES: ConfigCategoryDef[] = [
           'sessions',
           'restore',
           'unarchive',
-          '\u5f52\u6863',
-          '\u4f1a\u8bdd',
         ],
       },
       {
@@ -121,8 +119,6 @@ export const SETTINGS_CATEGORIES: ConfigCategoryDef[] = [
           'keybinding',
           'hotkey',
           'shortcut key',
-          '\u5feb\u6377\u952e',
-          '\u952e\u4f4d',
         ],
       },
     ],
@@ -143,8 +139,6 @@ export const SETTINGS_CATEGORIES: ConfigCategoryDef[] = [
           'pixel',
           'pet',
           'partner',
-          '\u4f19\u4f34',
-          '\u4e2a\u6027\u5316',
         ],
       },
       {
@@ -167,7 +161,6 @@ export const SETTINGS_CATEGORIES: ConfigCategoryDef[] = [
           'search',
           'flashgrep',
           'index',
-          '\u6743\u9650',
         ],
       },
       {
@@ -182,8 +175,6 @@ export const SETTINGS_CATEGORIES: ConfigCategoryDef[] = [
           'pull request',
           'post-coding',
           'shortcut',
-          '快捷动作',
-          '提交',
         ],
       },
       {
@@ -198,8 +189,6 @@ export const SETTINGS_CATEGORIES: ConfigCategoryDef[] = [
           'subagent',
           'readonly',
           'audit',
-          '\u5ba1\u6838',
-          '\u4ee3\u7801\u5ba1\u6838',
         ],
       },
       {
diff --git a/src/web-ui/src/flow_chat/components/FlowTextBlock.tsx b/src/web-ui/src/flow_chat/components/FlowTextBlock.tsx
index 941083aba..7d70090e0 100644
--- a/src/web-ui/src/flow_chat/components/FlowTextBlock.tsx
+++ b/src/web-ui/src/flow_chat/components/FlowTextBlock.tsx
@@ -12,7 +12,6 @@ import { DotMatrixLoader } from '@/component-library';
 import type { FlowTextItem } from '../types/flow-chat';
 import { useFlowChatContext } from './modern/FlowChatContext';
 import { useTypewriter } from '../hooks/useTypewriter';
-import { processingHintsZh, processingHintsEn } from '../constants/processingHints';
 import './FlowTextBlock.scss';
 
 // Idle timeout (ms) after content stops growing.
@@ -24,6 +23,25 @@ interface FlowTextBlockProps {
   replayStreamingOnMount?: boolean;
 }
 
+const RuntimeStatusBlock: React.FC<Pick<FlowTextBlockProps, 'textItem' | 'className'>> = ({ textItem, className = '' }) => {
+  const { t } = useTranslation('flow-chat/processing-hints');
+  const rawHints = t('items', { returnObjects: true });
+  const hints = Array.isArray(rawHints)
+    ? rawHints.filter((item): item is string => typeof item === 'string')
+    : [];
+  const hintIndex = hints.length > 0
+    ? Math.abs(textItem.id.split('').reduce((acc, ch) => acc + ch.charCodeAt(0), 0)) % hints.length
+    : 0;
+  const hint = hints[hintIndex] ?? '';
+
+  return (
+    <div className={`flow-text-block flow-text-block--runtime-status ${className}`}>
+      <DotMatrixLoader size="medium" className="flow-text-block__runtime-status-icon" />
+      {hint && <span className="flow-text-block__runtime-status-text">{hint}</span>}
+    </div>
+  );
+};
+
 /**
  * Use React.memo to avoid unnecessary re-renders.
  * Re-render only when key textItem fields change.
@@ -34,7 +52,6 @@ export const FlowTextBlock = React.memo<FlowTextBlockProps>(({
   replayStreamingOnMount = true
 }) => {
   const { onFileViewRequest, onTabOpen, onHttpLinkClick, onOpenVisualization } = useFlowChatContext();
-  const { i18n } = useTranslation();
 
   // Normalize content to a string.
   const content = typeof textItem.content === 'string'
@@ -84,16 +101,7 @@ export const FlowTextBlock = React.memo<FlowTextBlockProps>(({
     isContentGrowing;
 
   if (textItem.runtimeStatus) {
-    const hints = i18n.language.startsWith('zh') ? processingHintsZh : processingHintsEn;
-    const hintIndex = Math.abs(textItem.id.split('').reduce((acc, ch) => acc + ch.charCodeAt(0), 0)) % hints.length;
-    const hint = hints[hintIndex];
-
-    return (
-      <div className={`flow-text-block flow-text-block--runtime-status ${className}`}>
-        <DotMatrixLoader size="medium" className="flow-text-block__runtime-status-icon" />
-        <span className="flow-text-block__runtime-status-text">{hint}</span>
-      </div>
-    );
+    return <RuntimeStatusBlock textItem={textItem} className={className} />;
   }
 
   return (
diff --git a/src/web-ui/src/flow_chat/components/modern/ProcessingIndicator.tsx b/src/web-ui/src/flow_chat/components/modern/ProcessingIndicator.tsx
index a5715e345..eb79194fd 100644
--- a/src/web-ui/src/flow_chat/components/modern/ProcessingIndicator.tsx
+++ b/src/web-ui/src/flow_chat/components/modern/ProcessingIndicator.tsx
@@ -8,7 +8,6 @@
 import React, { useEffect, useRef, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import { DotMatrixLoader } from '@/component-library';
-import { processingHintsZh, processingHintsEn } from '../../constants/processingHints';
 import './ProcessingIndicator.scss';
 
 interface ProcessingIndicatorProps {
@@ -18,8 +17,11 @@ interface ProcessingIndicatorProps {
 }
 
 export const ProcessingIndicator: React.FC<ProcessingIndicatorProps> = ({ visible, reserveSpace = false }) => {
-  const { i18n } = useTranslation();
-  const hints = i18n.language.startsWith('zh') ? processingHintsZh : processingHintsEn;
+  const { t } = useTranslation('flow-chat/processing-hints');
+  const rawHints = t('items', { returnObjects: true });
+  const hints = Array.isArray(rawHints)
+    ? rawHints.filter((item): item is string => typeof item === 'string')
+    : [];
 
   const [showHint, setShowHint] = useState(false);
   const [hintIndex, setHintIndex] = useState(0);
@@ -28,7 +30,7 @@ export const ProcessingIndicator: React.FC<ProcessingIndicatorProps> = ({ visibl
   const rotateTimerRef = useRef<ReturnType<typeof setInterval> | null>(null);
 
   useEffect(() => {
-    if (visible) {
+    if (visible && hints.length > 0) {
       const initialIndex = Math.floor(Math.random() * hints.length);
       setHintIndex(initialIndex);
 
diff --git a/src/web-ui/src/flow_chat/constants/processingHints.ts b/src/web-ui/src/flow_chat/constants/processingHints.ts
deleted file mode 100644
index b3fd4372e..000000000
--- a/src/web-ui/src/flow_chat/constants/processingHints.ts
+++ /dev/null
@@ -1,420 +0,0 @@
-/**
- * Fun processing hint messages shown while the AI is working.
- * Designed to ease user anxiety with light-hearted copy.
- */
-
-export const processingHintsZh: string[] = [
-  // --- Tech / ML metaphors ---
-  "思维回路全速运转...",
-  "Token 们奋力排列中...",
-  "矩阵乘法进行中...",
-  "Transformer 全力变形...",
-  "Embeddings 寻找彼此...",
-  "最后一次梯度下降...",
-  "注意力机制已锁定...",
-  "思维发动机轰鸣启动...",
-  "思维路线图展开中...",
-  "激活函数全员上岗...",
-  "推理链跑起来了...",
-  "十四亿参数找答案...",
-  "上下文窗口挤一挤...",
-  "最合适的词正在出现...",
-  "正在 Debug 思维链...",
-  "推导链节节延伸...",
-  "在语言的岔路口选方向...",
-  "思路全线开动...",
-  "向量空间里迷了路...",
-  "量子态还没塌缩...",
-  "正在过滤噪音...",
-  "从千万想法里提炼精华...",
-  "灵感之流汇聚成河...",
-  "数百万次思考之后...",
-  "所有脑力为你服务...",
-  "思绪整装，即将出发...",
-
-  // --- Personification & humor ---
-  "给神经网络倒咖啡...",
-  "模型正在思考人生...",
-  "神经元群情激昂...",
-  "反向传播感悟中...",
-  "正在召开内部评审会...",
-  "多个思路正在 PK...",
-  "神经元：已就位...",
-  "神经网络的午夜加班...",
-  "正在假装镇定地高速运转...",
-  "暗中使力中...",
-  "绞尽脑汁为你服务...",
-  "正在对话宇宙...",
-  "向宇宙借创意...",
-
-  // --- Progress ---
-  "答案在路上了...",
-  "拼图最后一块到位...",
-  "思路合流中...",
-  "逻辑线头找到了...",
-  "差不多了，收尾中...",
-  "还差一点点...",
-  "就差临门一脚...",
-  "搞定了百分之九十九...",
-  "最终赢家即将揭晓...",
-  "答案正在着陆跑道...",
-  "最后校对一遍...",
-  "正在打磨最后措辞...",
-  "正在精简表达...",
-  "填充最后几块拼图...",
-  "高质量输出即将发射...",
-  "系好安全带，即将着陆...",
-  "即将顿悟...",
-  "答案就在嘴边...",
-
-  // --- Imagination ---
-  "翻阅无数可能中...",
-  "召唤创意，稍候...",
-  "脑洞已打开...",
-  "在十万八千条思路里取最优...",
-  "把你的问题投影到高维空间...",
-  "好问题！让我选一个薛定谔的答案...",
-  "在知识图谱里找路...",
-  "知识正在快速结晶...",
-  "把抽象想法具体化...",
-  "思维导图疯狂生长...",
-  "在概念森林砍出一条路...",
-  "想法从潜空间投影...",
-  "将混乱整理成诗...",
-  "折叠所有可能成一答...",
-  "举一反三进行中...",
-  "联想力爆棚中...",
-  "正在破解难题密码...",
-  "智慧的光正在聚焦...",
-
-  // --- Light & confident ---
-  "字斟句酌，只给精华...",
-  "想想，再想想...",
-  "已经快了（真的）...",
-  "快了！（不是在敷衍）",
-  "这道题，我会！",
-  "收到！全力处理中...",
-  "就在这里，别急...",
-  "全情投入，心无旁骛...",
-  "私下已想了七八种方案...",
-  "比想象中更努力...",
-  "认真的，从没这么认真过...",
-  "比光速还快（误）...",
-  "才华正在集中爆发...",
-  "正在憋大招...",
-  "超强输出，即将到来...",
-  "最强答案正在成形...",
-
-  // --- Concrete metaphors ---
-  "把散落的灵感拼起来...",
-  "用知识蒸馏一杯好茶...",
-  "灵感在深处发酵...",
-  "知识浪潮涌向输出端...",
-  "脑图正在扩展中...",
-  "思维潮水汇聚中...",
-  "思维火焰正旺...",
-  "知识在快速结晶...",
-  "脑内灯泡闪烁中...",
-  "思路打结，解开中...",
-  "思维信号穿梭神经丛...",
-  "秒速百公里地思考...",
-  "知识储备调用中...",
-  "知识能量正在充能...",
-  "智慧内核全速转...",
-
-  // --- Care & focus ---
-  "脑子已经全力转起来了...",
-  "正在为你量身定制...",
-  "把最好的留到最后...",
-  "用心对待每一个字...",
-  "全神贯注于你的问题...",
-  "注意力全给你了...",
-  "这一刻，全给你...",
-  "正在起草一份诚意回答...",
-  "灵感正在悄悄聚拢...",
-  "倾尽所有给你答案...",
-  "绝不摆烂，全力以赴...",
-  "努力营业中...",
-
-  // --- Short beats ---
-  "混沌转逻辑中...",
-  "思考齿轮咬合中...",
-  "解码深邃想法中...",
-  "合并所有子思路...",
-  "抢救迷失的语义...",
-  "拆解成千个小问题...",
-  "千个念头取最好...",
-  "把想法和文字对齐...",
-  "整理千头万绪中...",
-  "确认答案合理性中...",
-  "检查一遍，再检查...",
-  "把模糊变清晰中...",
-  "思维正在对焦...",
-  "多线程思维全力汇总...",
-  "把逻辑再拧紧一点...",
-  "让逻辑自己说话...",
-  "在语言丛林里寻宝...",
-
-  // --- More fun ---
-  "全速冲刺，答案在望...",
-  "思维扩容，装下更多...",
-  "为回答精心调味...",
-  "给逻辑链上润滑油...",
-  "把回答装进包裹打结中...",
-  "逻辑拼图已完成...",
-  "有条不紊，稳步推进...",
-  "万事就绪，答案出发...",
-  "脑波达到最高频...",
-  "思路刚打通，马上来...",
-  "解开语言的最后一层...",
-  "用推理缝合碎片...",
-  "召开紧急大脑会议...",
-  "整理出最佳路径...",
-  "正在审阅自己的思维...",
-  "正在进行最后冲刺...",
-  "努力中，绝不放弃...",
-  "正在做些不可思议的事...",
-  "思考容量拉满...",
-  "我在，我想，我输出...",
-  "后台小剧场精彩上演...",
-  "正在奋笔疾书...",
-  "在参数空间漫步...",
-  "正在将想法变为现实...",
-  "知识全力驰援中...",
-  "删删改改中...",
-  "像素精灵正在组字...",
-  "比特们正在排队...",
-  "比特流已启动...",
-  "思维启动加速度...",
-  "正在给回答注入灵魂...",
-  "准备好了吗？快了...",
-  "就差最后一步...",
-  "输出即将解冻...",
-  "神经丛林探险中...",
-  "答案雏形已在手...",
-  "思路正在合流...",
-  "尽力而为，必有所获...",
-  "正在快乐工作中...",
-  "大脑正在全速燃烧...",
-  "答案即将成形...",
-  "思维的潮水汇聚中...",
-  "正在把复杂变简单...",
-  "脑中千个念头筛选中...",
-  "正在为你开天辟地...",
-  "知识海洋里捞最优解...",
-  "万亿可能取其一...",
-  "答案正在破壳而出...",
-  "大脑高速公路全线畅通...",
-  "最佳路径已锁定...",
-  "思维齐步走，答案来了...",
-  "大招正在蓄力中...",
-  "答案即将横空出世...",
-];
-
-export const processingHintsEn: string[] = [
-  // --- Tech / ML metaphors ---
-  "Neural circuits running at full speed...",
-  "Tokens lining up in perfect order...",
-  "Matrix multiplications in progress...",
-  "Transformer: transforming at full capacity...",
-  "Embeddings searching for their soulmates...",
-  "One final gradient descent to go...",
-  "Attention heads: activated and locked...",
-  "Thought engine roaring to life...",
-  "Mental roadmap unfolding...",
-  "Activation functions reporting for duty...",
-  "Reasoning chain is running...",
-  "Spelunking through fourteen billion parameters...",
-  "Squeezing into the context window...",
-  "The perfect word is surfacing...",
-  "Debugging my own chain of thought...",
-  "Reasoning links extending one by one...",
-  "Picking a path through the language labyrinth...",
-  "All thought lanes open and moving...",
-  "Got lost in vector space, back soon...",
-  "Quantum state hasn't collapsed yet...",
-  "Filtering out the noise...",
-  "Distilling the best from a million thoughts...",
-  "Rivers of inspiration converging...",
-  "After millions of mental iterations...",
-  "All brainpower dedicated to you...",
-  "Thoughts packed and ready to go...",
-
-  // --- Personification & humor ---
-  "Feeding the model its morning coffee...",
-  "Pondering the meaning of tokens...",
-  "Neurons firing in passionate debate...",
-  "Backpropagating through life choices...",
-  "Holding an internal peer review...",
-  "Multiple ideas in a heated competition...",
-  "Neurons: reporting for duty...",
-  "Neural network pulling an all-nighter...",
-  "Pretending to be calm while going full speed...",
-  "Quietly working magic in the background...",
-  "Wracking every synapse for your sake...",
-  "Consulting the cosmos...",
-  "Borrowing creativity from the universe...",
-
-  // --- Progress ---
-  "Answer is on its way...",
-  "Last puzzle piece sliding into place...",
-  "Thoughts merging into one stream...",
-  "Found the thread of logic...",
-  "Almost done, wrapping up...",
-  "Just a tiny bit more...",
-  "One final push to go...",
-  "Ninety-nine percent done...",
-  "The winner is about to be revealed...",
-  "Answer on final approach for landing...",
-  "One last proofread...",
-  "Polishing the last few words...",
-  "Trimming the fat from the response...",
-  "Filling in the last few puzzle pieces...",
-  "High-quality output launching soon...",
-  "Fasten your seatbelt — landing shortly...",
-  "Epiphany incoming...",
-  "Answer is right on the tip of my tongue...",
-
-  // --- Imagination ---
-  "Rummaging through the multiverse of ideas...",
-  "Summoning creativity, please hold...",
-  "Brain hole: open...",
-  "Picking the best from ten thousand thoughts...",
-  "Projecting your question into high-dimensional space...",
-  "Great question! Picking from Schrödinger's answers...",
-  "Navigating the knowledge graph...",
-  "Knowledge crystallizing rapidly...",
-  "Turning abstract ideas into concrete ones...",
-  "Mind map expanding like wildfire...",
-  "Hacking a path through the concept forest...",
-  "Ideas projecting from latent space...",
-  "Turning chaos into something like poetry...",
-  "Folding all possible futures into one answer...",
-  "Analogical reasoning in progress...",
-  "Associative power: overclocked...",
-  "Cracking the code of a tough problem...",
-  "Focusing the beam of intelligence...",
-
-  // --- Light & confident ---
-  "Hand-picking only the best words...",
-  "Let me think... still thinking...",
-  "I'm fast, I promise...",
-  "Almost there! (Not stalling, really)",
-  "I know this one!",
-  "Roger that! Processing at full capacity...",
-  "Right here, no rush...",
-  "Fully in the zone right now...",
-  "Already tried seven different approaches internally...",
-  "Working harder than you'd expect...",
-  "Never been this focused in my life...",
-  "Faster than light (not really)...",
-  "Talent concentrated and detonating...",
-  "Charging up the big move...",
-  "Supercharged output incoming...",
-  "The best answer is taking shape...",
-
-  // --- Concrete metaphors ---
-  "Gathering the scattered sparks of inspiration...",
-  "Distilling knowledge into a fine brew...",
-  "Ideas fermenting in the neural depths...",
-  "Tidal waves of knowledge rushing to the output...",
-  "Mind map expanding at max speed...",
-  "Waves of thought converging...",
-  "Thinking flame burning bright...",
-  "Knowledge solidifying into form...",
-  "Lightbulb flickering in the back of my mind...",
-  "Untangling the knots in my reasoning...",
-  "Thought signals racing through the neural jungle...",
-  "Thinking at hundreds of miles per second...",
-  "Pulling from deep knowledge reserves...",
-  "Knowledge energy charging up...",
-  "Intelligence core running at max rpm...",
-
-  // --- Care & focus ---
-  "Brain already spinning at full tilt...",
-  "Tailoring this response just for you...",
-  "Saving the best for last...",
-  "Crafting every word with care...",
-  "Fully focused on your question...",
-  "All attention given to you...",
-  "This moment is entirely for you...",
-  "Drafting a sincere and thoughtful reply...",
-  "Inspiration quietly gathering...",
-  "Giving everything I've got for your answer...",
-  "Zero slacking, full effort...",
-  "Diligently serving your request...",
-
-  // --- Short beats ---
-  "Converting chaos into logic...",
-  "Gears of thought clicking into place...",
-  "Decoding your profound question...",
-  "Merging all sub-ideas...",
-  "Rescuing lost semantic meaning...",
-  "Breaking it into a thousand micro-problems...",
-  "Picking the best of a thousand thoughts...",
-  "Lining up thoughts with words...",
-  "Sorting through a tangle of threads...",
-  "Verifying the answer makes sense...",
-  "Checking once, then checking again...",
-  "Turning fuzzy into clear...",
-  "Thoughts coming into focus...",
-  "All threads converging at full speed...",
-  "Tightening the logic just a little more...",
-  "Letting logic speak for itself...",
-  "Treasure-hunting through the language forest...",
-
-  // --- More fun ---
-  "Sprinting to the finish line...",
-  "Expanding the thought tank...",
-  "Adding just the right pinch of creativity...",
-  "Oiling the chain of logic...",
-  "Tying a bow on your response package...",
-  "Logic puzzle: assembled...",
-  "Moving steadily, step by step...",
-  "Everything ready — answer departing now...",
-  "Brainwave frequency at all-time high...",
-  "Thread of thought just clicked — almost there...",
-  "Unwrapping the final layer of language...",
-  "Stitching the fragments together with reasoning...",
-  "Calling an emergency brain session...",
-  "Plotting the optimal path...",
-  "Reviewing my own chain of thought...",
-  "Making the final sprint...",
-  "Pushing through, won't give up...",
-  "Doing something kind of amazing right now...",
-  "Thinking capacity: maxed out...",
-  "I think, therefore I output...",
-  "A tiny drama unfolding backstage...",
-  "Writing at full speed...",
-  "Wandering the parameter space...",
-  "Turning ideas into reality...",
-  "All knowledge rallying to help...",
-  "Editing and re-editing...",
-  "Pixel elves composing text...",
-  "Bits falling into line...",
-  "Bit stream: engaged...",
-  "Thought engine accelerating...",
-  "Infusing the response with soul...",
-  "Ready for it? Almost there...",
-  "One last step to go...",
-  "Output thawing out...",
-  "Exploring the neural jungle...",
-  "Answer prototype taking form...",
-  "Thoughts flowing into one channel...",
-  "Doing my very best, as always...",
-  "Happily working away...",
-  "Brain burning at full speed...",
-  "Answer taking shape...",
-  "Waves of thought converging on the answer...",
-  "Turning complexity into simplicity...",
-  "Filtering thousands of thoughts right now...",
-  "Creating something from nothing, just for you...",
-  "Fishing the best answer from an ocean of knowledge...",
-  "One in a trillion possibilities, chosen for you...",
-  "Answer hatching right now...",
-  "The brain highway is clear and running fast...",
-  "Optimal path: locked in...",
-  "Thoughts marching in step — answer incoming...",
-  "Done in one second (approximately)...",
-  "Casting a chaos-to-clarity spell...",
-];
diff --git a/src/web-ui/src/flow_chat/services/flow-chat-manager/SessionModule.ts b/src/web-ui/src/flow_chat/services/flow-chat-manager/SessionModule.ts
index e9d74e71b..953f6c2c8 100644
--- a/src/web-ui/src/flow_chat/services/flow-chat-manager/SessionModule.ts
+++ b/src/web-ui/src/flow_chat/services/flow-chat-manager/SessionModule.ts
@@ -747,7 +747,7 @@ export async function ensureBackendSession(
       const raw = typeof e?.message === 'string' ? e.message : String(e);
       const hint =
         raw.includes('Session metadata not found') || raw.includes('Not found')
-          ? '在后端找不到该会话数据。若刚重新连接过 SSH 远程工作区，请关闭并重新打开该远程项目，或新建会话后再试。'
+          ? i18nService.t('flow-chat:historyState.remoteSessionMissing')
           : raw;
       throw new Error(hint);
     }
diff --git a/src/web-ui/src/infrastructure/config/services/AgentCompanionPetService.ts b/src/web-ui/src/infrastructure/config/services/AgentCompanionPetService.ts
index eb6c907aa..f3d0e205d 100644
--- a/src/web-ui/src/infrastructure/config/services/AgentCompanionPetService.ts
+++ b/src/web-ui/src/infrastructure/config/services/AgentCompanionPetService.ts
@@ -3,9 +3,11 @@ import { readFile } from '@tauri-apps/plugin-fs';
 import type { AgentCompanionPetSelection } from './AIExperienceConfigService';
 import { isTauriRuntime } from '@/infrastructure/runtime';
 import { createLogger } from '@/shared/utils/logger';
+import builtinPetMetadata from './agentCompanionBuiltinPetMetadata.json';
 
 const log = createLogger('AgentCompanionPetService');
 const BUILTIN_PET_BASE = '/agent-companion-pets';
+const BUILTIN_PET_DISPLAY_NAMES = builtinPetMetadata.displayNames;
 
 export const DEFAULT_AGENT_COMPANION_PET: AgentCompanionPetSelection = {
   id: 'panda-pix',
@@ -89,7 +91,7 @@ const BUILTIN_PETS: AgentCompanionPetSelection[] = [
   },
   {
     id: 'gugugaga',
-    displayName: '咕咕嘎嘎',
+    displayName: BUILTIN_PET_DISPLAY_NAMES.gugugaga,
     description: 'A cheerful chibi girl in a black penguin suit with a simple silver collar pendant.',
     source: 'preset',
     packagePath: `${BUILTIN_PET_BASE}/gugugaga`,
@@ -117,7 +119,7 @@ const BUILTIN_PETS: AgentCompanionPetSelection[] = [
   },
   {
     id: 'jiyi',
-    displayName: '吉伊',
+    displayName: BUILTIN_PET_DISPLAY_NAMES.jiyi,
     description:
       'A round white chibi bear with dark chocolate outlines, pink cheeks, tiny limbs, curled ears, and a small pink bear pouch.',
     source: 'preset',
diff --git a/src/web-ui/src/infrastructure/config/services/agentCompanionBuiltinPetMetadata.json b/src/web-ui/src/infrastructure/config/services/agentCompanionBuiltinPetMetadata.json
new file mode 100644
index 000000000..b4408c78f
--- /dev/null
+++ b/src/web-ui/src/infrastructure/config/services/agentCompanionBuiltinPetMetadata.json
@@ -0,0 +1,6 @@
+{
+  "displayNames": {
+    "gugugaga": "咕咕嘎嘎",
+    "jiyi": "吉伊"
+  }
+}
diff --git a/src/web-ui/src/infrastructure/i18n/presets/namespaceRegistry.ts b/src/web-ui/src/infrastructure/i18n/presets/namespaceRegistry.ts
index e13ff6f43..7f1f820d9 100644
--- a/src/web-ui/src/infrastructure/i18n/presets/namespaceRegistry.ts
+++ b/src/web-ui/src/infrastructure/i18n/presets/namespaceRegistry.ts
@@ -9,6 +9,7 @@ export const ALL_NAMESPACES = [
   'components',
   'errors',
   'flow-chat',
+  'flow-chat/processing-hints',
   'notifications',
   'panels/files',
   'panels/git',
diff --git a/src/web-ui/src/locales/en-US/common.json b/src/web-ui/src/locales/en-US/common.json
index 5f6b7a866..72c4a0942 100644
--- a/src/web-ui/src/locales/en-US/common.json
+++ b/src/web-ui/src/locales/en-US/common.json
@@ -858,6 +858,7 @@
     "fixPreview": "Fix Preview",
     "gitDiff": "Git Diff",
     "gitSettings": "Git Settings",
+    "pullRequests": "Pull Requests",
     "taskPlanner": "Task Planner",
     "fileBrowser": "File Browser",
     "editor": "Editor",
diff --git a/src/web-ui/src/locales/en-US/flow-chat.json b/src/web-ui/src/locales/en-US/flow-chat.json
index e1f2ba51d..8e33c9442 100644
--- a/src/web-ui/src/locales/en-US/flow-chat.json
+++ b/src/web-ui/src/locales/en-US/flow-chat.json
@@ -44,6 +44,7 @@
     "loadingDescription": "Preparing the conversation history.",
     "failedTitle": "Session history did not load",
     "failedDescription": "Retry loading the saved conversation.",
+    "remoteSessionMissing": "The backend session data was not found. If you just reconnected an SSH remote workspace, close and reopen the remote project, or create a new session and try again.",
     "retry": "Retry"
   },
   "usage": {
diff --git a/src/web-ui/src/locales/en-US/flow-chat/processing-hints.json b/src/web-ui/src/locales/en-US/flow-chat/processing-hints.json
new file mode 100644
index 000000000..610131aae
--- /dev/null
+++ b/src/web-ui/src/locales/en-US/flow-chat/processing-hints.json
@@ -0,0 +1,192 @@
+{
+  "items": [
+    "Neural circuits running at full speed...",
+    "Tokens lining up in perfect order...",
+    "Matrix multiplications in progress...",
+    "Transformer: transforming at full capacity...",
+    "Embeddings searching for their soulmates...",
+    "One final gradient descent to go...",
+    "Attention heads: activated and locked...",
+    "Thought engine roaring to life...",
+    "Mental roadmap unfolding...",
+    "Activation functions reporting for duty...",
+    "Reasoning chain is running...",
+    "Spelunking through fourteen billion parameters...",
+    "Squeezing into the context window...",
+    "The perfect word is surfacing...",
+    "Debugging my own chain of thought...",
+    "Reasoning links extending one by one...",
+    "Picking a path through the language labyrinth...",
+    "All thought lanes open and moving...",
+    "Got lost in vector space, back soon...",
+    "Quantum state hasn't collapsed yet...",
+    "Filtering out the noise...",
+    "Distilling the best from a million thoughts...",
+    "Rivers of inspiration converging...",
+    "After millions of mental iterations...",
+    "All brainpower dedicated to you...",
+    "Thoughts packed and ready to go...",
+    "Feeding the model its morning coffee...",
+    "Pondering the meaning of tokens...",
+    "Neurons firing in passionate debate...",
+    "Backpropagating through life choices...",
+    "Holding an internal peer review...",
+    "Multiple ideas in a heated competition...",
+    "Neurons: reporting for duty...",
+    "Neural network pulling an all-nighter...",
+    "Pretending to be calm while going full speed...",
+    "Quietly working magic in the background...",
+    "Wracking every synapse for your sake...",
+    "Consulting the cosmos...",
+    "Borrowing creativity from the universe...",
+    "Answer is on its way...",
+    "Last puzzle piece sliding into place...",
+    "Thoughts merging into one stream...",
+    "Found the thread of logic...",
+    "Almost done, wrapping up...",
+    "Just a tiny bit more...",
+    "One final push to go...",
+    "Ninety-nine percent done...",
+    "The winner is about to be revealed...",
+    "Answer on final approach for landing...",
+    "One last proofread...",
+    "Polishing the last few words...",
+    "Trimming the fat from the response...",
+    "Filling in the last few puzzle pieces...",
+    "High-quality output launching soon...",
+    "Fasten your seatbelt — landing shortly...",
+    "Epiphany incoming...",
+    "Answer is right on the tip of my tongue...",
+    "Rummaging through the multiverse of ideas...",
+    "Summoning creativity, please hold...",
+    "Brain hole: open...",
+    "Picking the best from ten thousand thoughts...",
+    "Projecting your question into high-dimensional space...",
+    "Great question! Picking from Schrödinger's answers...",
+    "Navigating the knowledge graph...",
+    "Knowledge crystallizing rapidly...",
+    "Turning abstract ideas into concrete ones...",
+    "Mind map expanding like wildfire...",
+    "Hacking a path through the concept forest...",
+    "Ideas projecting from latent space...",
+    "Turning chaos into something like poetry...",
+    "Folding all possible futures into one answer...",
+    "Analogical reasoning in progress...",
+    "Associative power: overclocked...",
+    "Cracking the code of a tough problem...",
+    "Focusing the beam of intelligence...",
+    "Hand-picking only the best words...",
+    "Let me think... still thinking...",
+    "I'm fast, I promise...",
+    "Almost there! (Not stalling, really)",
+    "I know this one!",
+    "Roger that! Processing at full capacity...",
+    "Right here, no rush...",
+    "Fully in the zone right now...",
+    "Already tried seven different approaches internally...",
+    "Working harder than you'd expect...",
+    "Never been this focused in my life...",
+    "Faster than light (not really)...",
+    "Talent concentrated and detonating...",
+    "Charging up the big move...",
+    "Supercharged output incoming...",
+    "The best answer is taking shape...",
+    "Gathering the scattered sparks of inspiration...",
+    "Distilling knowledge into a fine brew...",
+    "Ideas fermenting in the neural depths...",
+    "Tidal waves of knowledge rushing to the output...",
+    "Mind map expanding at max speed...",
+    "Waves of thought converging...",
+    "Thinking flame burning bright...",
+    "Knowledge solidifying into form...",
+    "Lightbulb flickering in the back of my mind...",
+    "Untangling the knots in my reasoning...",
+    "Thought signals racing through the neural jungle...",
+    "Thinking at hundreds of miles per second...",
+    "Pulling from deep knowledge reserves...",
+    "Knowledge energy charging up...",
+    "Intelligence core running at max rpm...",
+    "Brain already spinning at full tilt...",
+    "Tailoring this response just for you...",
+    "Saving the best for last...",
+    "Crafting every word with care...",
+    "Fully focused on your question...",
+    "All attention given to you...",
+    "This moment is entirely for you...",
+    "Drafting a sincere and thoughtful reply...",
+    "Inspiration quietly gathering...",
+    "Giving everything I've got for your answer...",
+    "Zero slacking, full effort...",
+    "Diligently serving your request...",
+    "Converting chaos into logic...",
+    "Gears of thought clicking into place...",
+    "Decoding your profound question...",
+    "Merging all sub-ideas...",
+    "Rescuing lost semantic meaning...",
+    "Breaking it into a thousand micro-problems...",
+    "Picking the best of a thousand thoughts...",
+    "Lining up thoughts with words...",
+    "Sorting through a tangle of threads...",
+    "Verifying the answer makes sense...",
+    "Checking once, then checking again...",
+    "Turning fuzzy into clear...",
+    "Thoughts coming into focus...",
+    "All threads converging at full speed...",
+    "Tightening the logic just a little more...",
+    "Letting logic speak for itself...",
+    "Treasure-hunting through the language forest...",
+    "Sprinting to the finish line...",
+    "Expanding the thought tank...",
+    "Adding just the right pinch of creativity...",
+    "Oiling the chain of logic...",
+    "Tying a bow on your response package...",
+    "Logic puzzle: assembled...",
+    "Moving steadily, step by step...",
+    "Everything ready — answer departing now...",
+    "Brainwave frequency at all-time high...",
+    "Thread of thought just clicked — almost there...",
+    "Unwrapping the final layer of language...",
+    "Stitching the fragments together with reasoning...",
+    "Calling an emergency brain session...",
+    "Plotting the optimal path...",
+    "Reviewing my own chain of thought...",
+    "Making the final sprint...",
+    "Pushing through, won't give up...",
+    "Doing something kind of amazing right now...",
+    "Thinking capacity: maxed out...",
+    "I think, therefore I output...",
+    "A tiny drama unfolding backstage...",
+    "Writing at full speed...",
+    "Wandering the parameter space...",
+    "Turning ideas into reality...",
+    "All knowledge rallying to help...",
+    "Editing and re-editing...",
+    "Pixel elves composing text...",
+    "Bits falling into line...",
+    "Bit stream: engaged...",
+    "Thought engine accelerating...",
+    "Infusing the response with soul...",
+    "Ready for it? Almost there...",
+    "One last step to go...",
+    "Output thawing out...",
+    "Exploring the neural jungle...",
+    "Answer prototype taking form...",
+    "Thoughts flowing into one channel...",
+    "Doing my very best, as always...",
+    "Happily working away...",
+    "Brain burning at full speed...",
+    "Answer taking shape...",
+    "Waves of thought converging on the answer...",
+    "Turning complexity into simplicity...",
+    "Filtering thousands of thoughts right now...",
+    "Creating something from nothing, just for you...",
+    "Fishing the best answer from an ocean of knowledge...",
+    "One in a trillion possibilities, chosen for you...",
+    "Answer hatching right now...",
+    "The brain highway is clear and running fast...",
+    "Optimal path: locked in...",
+    "Thoughts marching in step — answer incoming...",
+    "Done in one second (approximately)...",
+    "Casting a chaos-to-clarity spell..."
+  ]
+}
diff --git a/src/web-ui/src/locales/en-US/settings.json b/src/web-ui/src/locales/en-US/settings.json
index 3257a1d8b..40d996d38 100644
--- a/src/web-ui/src/locales/en-US/settings.json
+++ b/src/web-ui/src/locales/en-US/settings.json
@@ -7,6 +7,14 @@
     "searchNoResults": "No matching settings",
     "searchClear": "Clear search",
     "beta": "Beta",
+    "searchAliases": {
+      "archivedSessions": [],
+      "keyboard": [],
+      "sessionPersonalization": [],
+      "sessionPermissions": [],
+      "quickActions": [],
+      "review": []
+    },
     "tabDescriptions": {
       "basics": "Logging, terminal shell, notifications, and launch at login.",
       "appearance": "Language, theme, and UI font size.",
diff --git a/src/web-ui/src/locales/zh-CN/common.json b/src/web-ui/src/locales/zh-CN/common.json
index 612e2fc67..293e7174e 100644
--- a/src/web-ui/src/locales/zh-CN/common.json
+++ b/src/web-ui/src/locales/zh-CN/common.json
@@ -858,6 +858,7 @@
     "fixPreview": "修复预览",
     "gitDiff": "Git Diff",
     "gitSettings": "Git 设置",
+    "pullRequests": "Pull Requests",
     "taskPlanner": "任务规划器",
     "fileBrowser": "文件浏览器",
     "editor": "编辑器",
diff --git a/src/web-ui/src/locales/zh-CN/flow-chat.json b/src/web-ui/src/locales/zh-CN/flow-chat.json
index 8b6c0ee15..c647fa18a 100644
--- a/src/web-ui/src/locales/zh-CN/flow-chat.json
+++ b/src/web-ui/src/locales/zh-CN/flow-chat.json
@@ -44,6 +44,7 @@
     "loadingDescription": "正在准备该会话的历史内容。",
     "failedTitle": "历史会话加载失败",
     "failedDescription": "可以重新加载已保存的会话内容。",
+    "remoteSessionMissing": "在后端找不到该会话数据。若刚重新连接过 SSH 远程工作区，请关闭并重新打开该远程项目，或新建会话后再试。",
     "retry": "重试"
   },
   "usage": {
diff --git a/src/web-ui/src/locales/zh-CN/flow-chat/processing-hints.json b/src/web-ui/src/locales/zh-CN/flow-chat/processing-hints.json
new file mode 100644
index 000000000..13cee1a38
--- /dev/null
+++ b/src/web-ui/src/locales/zh-CN/flow-chat/processing-hints.json
@@ -0,0 +1,192 @@
+{
+  "items": [
+    "思维回路全速运转...",
+    "Token 们奋力排列中...",
+    "矩阵乘法进行中...",
+    "Transformer 全力变形...",
+    "Embeddings 寻找彼此...",
+    "最后一次梯度下降...",
+    "注意力机制已锁定...",
+    "思维发动机轰鸣启动...",
+    "思维路线图展开中...",
+    "激活函数全员上岗...",
+    "推理链跑起来了...",
+    "十四亿参数找答案...",
+    "上下文窗口挤一挤...",
+    "最合适的词正在出现...",
+    "正在 Debug 思维链...",
+    "推导链节节延伸...",
+    "在语言的岔路口选方向...",
+    "思路全线开动...",
+    "向量空间里迷了路...",
+    "量子态还没塌缩...",
+    "正在过滤噪音...",
+    "从千万想法里提炼精华...",
+    "灵感之流汇聚成河...",
+    "数百万次思考之后...",
+    "所有脑力为你服务...",
+    "思绪整装，即将出发...",
+    "给神经网络倒咖啡...",
+    "模型正在思考人生...",
+    "神经元群情激昂...",
+    "反向传播感悟中...",
+    "正在召开内部评审会...",
+    "多个思路正在 PK...",
+    "神经元：已就位...",
+    "神经网络的午夜加班...",
+    "正在假装镇定地高速运转...",
+    "暗中使力中...",
+    "绞尽脑汁为你服务...",
+    "正在对话宇宙...",
+    "向宇宙借创意...",
+    "答案在路上了...",
+    "拼图最后一块到位...",
+    "思路合流中...",
+    "逻辑线头找到了...",
+    "差不多了，收尾中...",
+    "还差一点点...",
+    "就差临门一脚...",
+    "搞定了百分之九十九...",
+    "最终赢家即将揭晓...",
+    "答案正在着陆跑道...",
+    "最后校对一遍...",
+    "正在打磨最后措辞...",
+    "正在精简表达...",
+    "填充最后几块拼图...",
+    "高质量输出即将发射...",
+    "系好安全带，即将着陆...",
+    "即将顿悟...",
+    "答案就在嘴边...",
+    "翻阅无数可能中...",
+    "召唤创意，稍候...",
+    "脑洞已打开...",
+    "在十万八千条思路里取最优...",
+    "把你的问题投影到高维空间...",
+    "好问题！让我选一个薛定谔的答案...",
+    "在知识图谱里找路...",
+    "知识正在快速结晶...",
+    "把抽象想法具体化...",
+    "思维导图疯狂生长...",
+    "在概念森林砍出一条路...",
+    "想法从潜空间投影...",
+    "将混乱整理成诗...",
+    "折叠所有可能成一答...",
+    "举一反三进行中...",
+    "联想力爆棚中...",
+    "正在破解难题密码...",
+    "智慧的光正在聚焦...",
+    "字斟句酌，只给精华...",
+    "想想，再想想...",
+    "已经快了（真的）...",
+    "快了！（不是在敷衍）",
+    "这道题，我会！",
+    "收到！全力处理中...",
+    "就在这里，别急...",
+    "全情投入，心无旁骛...",
+    "私下已想了七八种方案...",
+    "比想象中更努力...",
+    "认真的，从没这么认真过...",
+    "比光速还快（误）...",
+    "才华正在集中爆发...",
+    "正在憋大招...",
+    "超强输出，即将到来...",
+    "最强答案正在成形...",
+    "把散落的灵感拼起来...",
+    "用知识蒸馏一杯好茶...",
+    "灵感在深处发酵...",
+    "知识浪潮涌向输出端...",
+    "脑图正在扩展中...",
+    "思维潮水汇聚中...",
+    "思维火焰正旺...",
+    "知识在快速结晶...",
+    "脑内灯泡闪烁中...",
+    "思路打结，解开中...",
+    "思维信号穿梭神经丛...",
+    "秒速百公里地思考...",
+    "知识储备调用中...",
+    "知识能量正在充能...",
+    "智慧内核全速转...",
+    "脑子已经全力转起来了...",
+    "正在为你量身定制...",
+    "把最好的留到最后...",
+    "用心对待每一个字...",
+    "全神贯注于你的问题...",
+    "注意力全给你了...",
+    "这一刻，全给你...",
+    "正在起草一份诚意回答...",
+    "灵感正在悄悄聚拢...",
+    "倾尽所有给你答案...",
+    "绝不摆烂，全力以赴...",
+    "努力营业中...",
+    "混沌转逻辑中...",
+    "思考齿轮咬合中...",
+    "解码深邃想法中...",
+    "合并所有子思路...",
+    "抢救迷失的语义...",
+    "拆解成千个小问题...",
+    "千个念头取最好...",
+    "把想法和文字对齐...",
+    "整理千头万绪中...",
+    "确认答案合理性中...",
+    "检查一遍，再检查...",
+    "把模糊变清晰中...",
+    "思维正在对焦...",
+    "多线程思维全力汇总...",
+    "把逻辑再拧紧一点...",
+    "让逻辑自己说话...",
+    "在语言丛林里寻宝...",
+    "全速冲刺，答案在望...",
+    "思维扩容，装下更多...",
+    "为回答精心调味...",
+    "给逻辑链上润滑油...",
+    "把回答装进包裹打结中...",
+    "逻辑拼图已完成...",
+    "有条不紊，稳步推进...",
+    "万事就绪，答案出发...",
+    "脑波达到最高频...",
+    "思路刚打通，马上来...",
+    "解开语言的最后一层...",
+    "用推理缝合碎片...",
+    "召开紧急大脑会议...",
+    "整理出最佳路径...",
+    "正在审阅自己的思维...",
+    "正在进行最后冲刺...",
+    "努力中，绝不放弃...",
+    "正在做些不可思议的事...",
+    "思考容量拉满...",
+    "我在，我想，我输出...",
+    "后台小剧场精彩上演...",
+    "正在奋笔疾书...",
+    "在参数空间漫步...",
+    "正在将想法变为现实...",
+    "知识全力驰援中...",
+    "删删改改中...",
+    "像素精灵正在组字...",
+    "比特们正在排队...",
+    "比特流已启动...",
+    "思维启动加速度...",
+    "正在给回答注入灵魂...",
+    "准备好了吗？快了...",
+    "就差最后一步...",
+    "输出即将解冻...",
+    "神经丛林探险中...",
+    "答案雏形已在手...",
+    "思路正在合流...",
+    "尽力而为，必有所获...",
+    "正在快乐工作中...",
+    "大脑正在全速燃烧...",
+    "答案即将成形...",
+    "思维的潮水汇聚中...",
+    "正在把复杂变简单...",
+    "脑中千个念头筛选中...",
+    "正在为你开天辟地...",
+    "知识海洋里捞最优解...",
+    "万亿可能取其一...",
+    "答案正在破壳而出...",
+    "大脑高速公路全线畅通...",
+    "最佳路径已锁定...",
+    "思维齐步走，答案来了...",
+    "大招正在蓄力中...",
+    "答案即将横空出世..."
+  ]
+}
diff --git a/src/web-ui/src/locales/zh-CN/settings.json b/src/web-ui/src/locales/zh-CN/settings.json
index 8aa42ec93..7f5d8a7ec 100644
--- a/src/web-ui/src/locales/zh-CN/settings.json
+++ b/src/web-ui/src/locales/zh-CN/settings.json
@@ -7,6 +7,14 @@
     "searchNoResults": "没有匹配的配置",
     "searchClear": "清除搜索",
     "beta": "Beta",
+    "searchAliases": {
+      "archivedSessions": ["归档", "会话"],
+      "keyboard": ["快捷键", "键位"],
+      "sessionPersonalization": ["伙伴", "个性化"],
+      "sessionPermissions": ["权限"],
+      "quickActions": ["快捷动作", "提交"],
+      "review": ["审核", "代码审核"]
+    },
     "tabDescriptions": {
       "basics": "日志、终端 Shell、通知与开机启动。",
       "appearance": "语言、主题与界面字体大小。",
diff --git a/src/web-ui/src/locales/zh-TW/common.json b/src/web-ui/src/locales/zh-TW/common.json
index 0adf1a3f9..b41615e29 100644
--- a/src/web-ui/src/locales/zh-TW/common.json
+++ b/src/web-ui/src/locales/zh-TW/common.json
@@ -858,6 +858,7 @@
     "fixPreview": "修復預覽",
     "gitDiff": "Git Diff",
     "gitSettings": "Git 設置",
+    "pullRequests": "Pull Requests",
     "taskPlanner": "任務規劃器",
     "fileBrowser": "文件瀏覽器",
     "editor": "編輯器",
diff --git a/src/web-ui/src/locales/zh-TW/flow-chat.json b/src/web-ui/src/locales/zh-TW/flow-chat.json
index 926ac937b..eca8be933 100644
--- a/src/web-ui/src/locales/zh-TW/flow-chat.json
+++ b/src/web-ui/src/locales/zh-TW/flow-chat.json
@@ -44,6 +44,7 @@
     "loadingDescription": "正在準備該會話的歷史內容。",
     "failedTitle": "歷史會話載入失敗",
     "failedDescription": "可以重新載入已儲存的會話內容。",
+    "remoteSessionMissing": "在後端找不到該會話資料。若剛重新連接過 SSH 遠端工作區，請關閉並重新打開該遠端項目，或新建會話後再試。",
     "retry": "重試"
   },
   "usage": {
diff --git a/src/web-ui/src/locales/zh-TW/flow-chat/processing-hints.json b/src/web-ui/src/locales/zh-TW/flow-chat/processing-hints.json
new file mode 100644
index 000000000..13cee1a38
--- /dev/null
+++ b/src/web-ui/src/locales/zh-TW/flow-chat/processing-hints.json
@@ -0,0 +1,192 @@
+{
+  "items": [
+    "思维回路全速运转...",
+    "Token 们奋力排列中...",
+    "矩阵乘法进行中...",
+    "Transformer 全力变形...",
+    "Embeddings 寻找彼此...",
+    "最后一次梯度下降...",
+    "注意力机制已锁定...",
+    "思维发动机轰鸣启动...",
+    "思维路线图展开中...",
+    "激活函数全员上岗...",
+    "推理链跑起来了...",
+    "十四亿参数找答案...",
+    "上下文窗口挤一挤...",
+    "最合适的词正在出现...",
+    "正在 Debug 思维链...",
+    "推导链节节延伸...",
+    "在语言的岔路口选方向...",
+    "思路全线开动...",
+    "向量空间里迷了路...",
+    "量子态还没塌缩...",
+    "正在过滤噪音...",
+    "从千万想法里提炼精华...",
+    "灵感之流汇聚成河...",
+    "数百万次思考之后...",
+    "所有脑力为你服务...",
+    "思绪整装，即将出发...",
+    "给神经网络倒咖啡...",
+    "模型正在思考人生...",
+    "神经元群情激昂...",
+    "反向传播感悟中...",
+    "正在召开内部评审会...",
+    "多个思路正在 PK...",
+    "神经元：已就位...",
+    "神经网络的午夜加班...",
+    "正在假装镇定地高速运转...",
+    "暗中使力中...",
+    "绞尽脑汁为你服务...",
+    "正在对话宇宙...",
+    "向宇宙借创意...",
+    "答案在路上了...",
+    "拼图最后一块到位...",
+    "思路合流中...",
+    "逻辑线头找到了...",
+    "差不多了，收尾中...",
+    "还差一点点...",
+    "就差临门一脚...",
+    "搞定了百分之九十九...",
+    "最终赢家即将揭晓...",
+    "答案正在着陆跑道...",
+    "最后校对一遍...",
+    "正在打磨最后措辞...",
+    "正在精简表达...",
+    "填充最后几块拼图...",
+    "高质量输出即将发射...",
+    "系好安全带，即将着陆...",
+    "即将顿悟...",
+    "答案就在嘴边...",
+    "翻阅无数可能中...",
+    "召唤创意，稍候...",
+    "脑洞已打开...",
+    "在十万八千条思路里取最优...",
+    "把你的问题投影到高维空间...",
+    "好问题！让我选一个薛定谔的答案...",
+    "在知识图谱里找路...",
+    "知识正在快速结晶...",
+    "把抽象想法具体化...",
+    "思维导图疯狂生长...",
+    "在概念森林砍出一条路...",
+    "想法从潜空间投影...",
+    "将混乱整理成诗...",
+    "折叠所有可能成一答...",
+    "举一反三进行中...",
+    "联想力爆棚中...",
+    "正在破解难题密码...",
+    "智慧的光正在聚焦...",
+    "字斟句酌，只给精华...",
+    "想想，再想想...",
+    "已经快了（真的）...",
+    "快了！（不是在敷衍）",
+    "这道题，我会！",
+    "收到！全力处理中...",
+    "就在这里，别急...",
+    "全情投入，心无旁骛...",
+    "私下已想了七八种方案...",
+    "比想象中更努力...",
+    "认真的，从没这么认真过...",
+    "比光速还快（误）...",
+    "才华正在集中爆发...",
+    "正在憋大招...",
+    "超强输出，即将到来...",
+    "最强答案正在成形...",
+    "把散落的灵感拼起来...",
+    "用知识蒸馏一杯好茶...",
+    "灵感在深处发酵...",
+    "知识浪潮涌向输出端...",
+    "脑图正在扩展中...",
+    "思维潮水汇聚中...",
+    "思维火焰正旺...",
+    "知识在快速结晶...",
+    "脑内灯泡闪烁中...",
+    "思路打结，解开中...",
+    "思维信号穿梭神经丛...",
+    "秒速百公里地思考...",
+    "知识储备调用中...",
+    "知识能量正在充能...",
+    "智慧内核全速转...",
+    "脑子已经全力转起来了...",
+    "正在为你量身定制...",
+    "把最好的留到最后...",
+    "用心对待每一个字...",
+    "全神贯注于你的问题...",
+    "注意力全给你了...",
+    "这一刻，全给你...",
+    "正在起草一份诚意回答...",
+    "灵感正在悄悄聚拢...",
+    "倾尽所有给你答案...",
+    "绝不摆烂，全力以赴...",
+    "努力营业中...",
+    "混沌转逻辑中...",
+    "思考齿轮咬合中...",
+    "解码深邃想法中...",
+    "合并所有子思路...",
+    "抢救迷失的语义...",
+    "拆解成千个小问题...",
+    "千个念头取最好...",
+    "把想法和文字对齐...",
+    "整理千头万绪中...",
+    "确认答案合理性中...",
+    "检查一遍，再检查...",
+    "把模糊变清晰中...",
+    "思维正在对焦...",
+    "多线程思维全力汇总...",
+    "把逻辑再拧紧一点...",
+    "让逻辑自己说话...",
+    "在语言丛林里寻宝...",
+    "全速冲刺，答案在望...",
+    "思维扩容，装下更多...",
+    "为回答精心调味...",
+    "给逻辑链上润滑油...",
+    "把回答装进包裹打结中...",
+    "逻辑拼图已完成...",
+    "有条不紊，稳步推进...",
+    "万事就绪，答案出发...",
+    "脑波达到最高频...",
+    "思路刚打通，马上来...",
+    "解开语言的最后一层...",
+    "用推理缝合碎片...",
+    "召开紧急大脑会议...",
+    "整理出最佳路径...",
+    "正在审阅自己的思维...",
+    "正在进行最后冲刺...",
+    "努力中，绝不放弃...",
+    "正在做些不可思议的事...",
+    "思考容量拉满...",
+    "我在，我想，我输出...",
+    "后台小剧场精彩上演...",
+    "正在奋笔疾书...",
+    "在参数空间漫步...",
+    "正在将想法变为现实...",
+    "知识全力驰援中...",
+    "删删改改中...",
+    "像素精灵正在组字...",
+    "比特们正在排队...",
+    "比特流已启动...",
+    "思维启动加速度...",
+    "正在给回答注入灵魂...",
+    "准备好了吗？快了...",
+    "就差最后一步...",
+    "输出即将解冻...",
+    "神经丛林探险中...",
+    "答案雏形已在手...",
+    "思路正在合流...",
+    "尽力而为，必有所获...",
+    "正在快乐工作中...",
+    "大脑正在全速燃烧...",
+    "答案即将成形...",
+    "思维的潮水汇聚中...",
+    "正在把复杂变简单...",
+    "脑中千个念头筛选中...",
+    "正在为你开天辟地...",
+    "知识海洋里捞最优解...",
+    "万亿可能取其一...",
+    "答案正在破壳而出...",
+    "大脑高速公路全线畅通...",
+    "最佳路径已锁定...",
+    "思维齐步走，答案来了...",
+    "大招正在蓄力中...",
+    "答案即将横空出世..."
+  ]
+}
diff --git a/src/web-ui/src/locales/zh-TW/settings.json b/src/web-ui/src/locales/zh-TW/settings.json
index f435f6829..0a960ab9b 100644
--- a/src/web-ui/src/locales/zh-TW/settings.json
+++ b/src/web-ui/src/locales/zh-TW/settings.json
@@ -7,6 +7,14 @@
     "searchNoResults": "沒有匹配的配置",
     "searchClear": "清除搜索",
     "beta": "Beta",
+    "searchAliases": {
+      "archivedSessions": ["歸檔", "會話"],
+      "keyboard": ["快捷鍵", "鍵位"],
+      "sessionPersonalization": ["夥伴", "個性化"],
+      "sessionPermissions": ["權限"],
+      "quickActions": ["快捷動作", "提交"],
+      "review": ["審核", "程式碼審核"]
+    },
     "tabDescriptions": {
       "basics": "日誌、終端 Shell、通知與開機啟動。",
       "appearance": "語言、主題與介面字體大小。",
diff --git a/src/web-ui/src/shared/ai-errors/aiErrorPresenter.ts b/src/web-ui/src/shared/ai-errors/aiErrorPresenter.ts
index 9c410a64d..c7afba066 100644
--- a/src/web-ui/src/shared/ai-errors/aiErrorPresenter.ts
+++ b/src/web-ui/src/shared/ai-errors/aiErrorPresenter.ts
@@ -1,3 +1,5 @@
+import providerMessageMatchers from './providerMessageMatchers.json';
+
 export type AiErrorCategory =
   | 'network'
   | 'auth'
@@ -209,15 +211,13 @@ function normalizeCategory(
       'not enough balance',
       'exceeded_current_quota',
       'exceeded current quota',
-      '余额不足',
-      '无可用资源包',
-      '账户已欠费',
+      ...providerMessageMatchers.providerQuota,
     ])
   ) {
     return 'provider_quota';
   }
 
-  if (includesAny(`${code} ${message}`, ['billing', 'membership expired', 'subscription expired', '套餐已到期', '1309'])) {
+  if (includesAny(`${code} ${message}`, ['billing', 'membership expired', 'subscription expired', ...providerMessageMatchers.providerBilling, '1309'])) {
     return 'provider_billing';
   }
 
diff --git a/src/web-ui/src/shared/ai-errors/providerMessageMatchers.json b/src/web-ui/src/shared/ai-errors/providerMessageMatchers.json
new file mode 100644
index 000000000..347027f2b
--- /dev/null
+++ b/src/web-ui/src/shared/ai-errors/providerMessageMatchers.json
@@ -0,0 +1,10 @@
+{
+  "providerQuota": [
+    "余额不足",
+    "无可用资源包",
+    "账户已欠费"
+  ],
+  "providerBilling": [
+    "套餐已到期"
+  ]
+}
diff --git a/src/web-ui/src/shared/utils/tabUtils.ts b/src/web-ui/src/shared/utils/tabUtils.ts
index 3322d8c8f..ada6e540d 100644
--- a/src/web-ui/src/shared/utils/tabUtils.ts
+++ b/src/web-ui/src/shared/utils/tabUtils.ts
@@ -277,7 +277,7 @@ export function createConfigCenterTab(
 export function createReviewPlatformTab(workspacePath?: string): void {
   const detail = {
     type: 'review-platform',
-    title: i18nService.getT()('common:tabs.pullRequests', { defaultValue: 'Pull Requests' }),
+    title: i18nService.getT()('common:tabs.pullRequests'),
     data: { workspacePath },
     metadata: {
       workspacePath,
diff --git a/src/web-ui/src/tools/editor/components/CodeEditor.tsx b/src/web-ui/src/tools/editor/components/CodeEditor.tsx
index 445d9392c..2e83b49f2 100644
--- a/src/web-ui/src/tools/editor/components/CodeEditor.tsx
+++ b/src/web-ui/src/tools/editor/components/CodeEditor.tsx
@@ -42,6 +42,7 @@ import {
 import { useI18n } from '@/infrastructure/i18n';
 import { EditorBreadcrumb } from './EditorBreadcrumb';
 import { EditorStatusBar } from './EditorStatusBar';
+import largeFileExpansionLabels from './largeFileExpansionLabels.json';
 
 const log = createLogger('CodeEditor');
 import {
@@ -100,7 +101,7 @@ const LARGE_FILE_SIZE_THRESHOLD_BYTES = 1 * 1024 * 1024; // 1MB
 const LARGE_FILE_MAX_LINE_LENGTH = 20000;
 const LARGE_FILE_RENDER_LINE_LIMIT = 10000;
 const LARGE_FILE_MAX_TOKENIZATION_LINE_LENGTH = 2000;
-const LARGE_FILE_EXPANSION_LABELS = ['show more', '显示更多', '展开更多'];
+const LARGE_FILE_EXPANSION_LABELS = largeFileExpansionLabels;
 
 /** Poll disk metadata for open file; only while tab is active (see isActiveTab). */
 const FILE_SYNC_POLL_INTERVAL_MS = 1000;
diff --git a/src/web-ui/src/tools/editor/components/largeFileExpansionLabels.json b/src/web-ui/src/tools/editor/components/largeFileExpansionLabels.json
new file mode 100644
index 000000000..575bc1846
--- /dev/null
+++ b/src/web-ui/src/tools/editor/components/largeFileExpansionLabels.json
@@ -0,0 +1,5 @@
+[
+  "show more",
+  "显示更多",
+  "展开更多"
+]