fix(mobile): raise the phone breakpoint from 430px to 600px

src/web/public/index.html

@@ -686,7 +686,7 @@ <h3 class="history-title" id="historyTitle">Resume Conversation</h3>
           <button class="btn-toolbar btn-shell" onclick="app.runShell()" title="Run Shell">
             Run Shell
           </button>
-          <!-- Phone-only: replaces the Shell button on ≤430px (Shell moves into the Run
+          <!-- Phone-only: replaces the Shell button under 600px (Shell moves into the Run
                dropdown there). Sends a bare Enter to the active session, the complement
                to the accessory bar's Esc. Hidden everywhere else — see styles.css. -->
           <button class="btn-toolbar btn-enter" onclick="app.sendEnterKey()" title="Send Enter">

src/web/public/mobile-handlers.js

@@ -85,20 +85,20 @@ const MobileDetection = {
     return /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
   },
 
-  /** Check if screen is small (phone-sized, <430px) */
+  /** Check if screen is small (phone-sized, <600px) */
   isSmallScreen() {
-    return window.innerWidth < 430;
+    return window.innerWidth < 600;
   },
 
-  /** Check if screen is medium (tablet-sized, 430-768px) */
+  /** Check if screen is medium (tablet-sized, 600-768px) */
   isMediumScreen() {
-    return window.innerWidth >= 430 && window.innerWidth < 768;
+    return window.innerWidth >= 600 && window.innerWidth < 768;
   },
 
   /** Get device type based on screen width */
   getDeviceType() {
     const width = window.innerWidth;
-    if (width < 430) return 'mobile';
+    if (width < 600) return 'mobile';
     if (width < 768) return 'tablet';
     return 'desktop';
   },

src/web/public/mobile-overview.js

@@ -12,7 +12,7 @@
  * the SAME comparator the desktop rail uses: blocked longest-first, then
  * running longest-first, then quiet most-recently-quiet first.
  *
- * PHONE ONLY. The gate is `shouldUseMobileOverview()` (viewport < 430px, not a
+ * PHONE ONLY. The gate is `shouldUseMobileOverview()` (viewport < 600px, not a
  * popped-out solo window, per-device setting on). Tablet and desktop keep the
  * welcome overlay untouched. The container ships with the `hidden` attribute and
  * only this module removes it, so desktop (which never loads mobile.css) cannot
@@ -38,7 +38,7 @@
  */
 
 /** Viewport width that counts as a phone. Matches the mobile.css phone block. */
-const MOBILE_OVERVIEW_PHONE_QUERY = '(max-width: 430px)';
+const MOBILE_OVERVIEW_PHONE_QUERY = '(max-width: 599px)';
 
 /** How many past conversations show before the "Show all" toggle. */
 const MOBILE_OVERVIEW_PAST_LIMIT = 8;

src/web/public/mobile.css

@@ -46,9 +46,9 @@ html.mobile-init .file-browser-panel {
 }
 
 /* ============================================================================
-   Tablet Breakpoint (430px - 768px)
+   Tablet Breakpoint (600px - 768px)
    ============================================================================ */
-@media (max-width: 768px) and (min-width: 430px) {
+@media (max-width: 768px) and (min-width: 600px) {
   /* Compact header for tablet - fixed at top, includes safe area padding */
   .header {
     position: fixed;
@@ -303,12 +303,12 @@ html.mobile-init .file-browser-panel {
   }
 
   /* Show desktop voice button on tablet (hidden by max-width:1023px in styles.css,
-     mobile .btn-voice-mobile only shows at <430px) */
+     mobile .btn-voice-mobile only shows at <600px) */
   .toolbar-center .btn-toolbar.btn-voice {
     display: flex !important;
   }
 
-  /* Toolbar — use desktop-style sizing on tablet (plenty of room at 430-768px) */
+  /* Toolbar — use desktop-style sizing on tablet (plenty of room at 600-768px) */
   .toolbar {
     padding: 0 0.5rem;
     gap: 0.5rem;
@@ -333,9 +333,9 @@ html.mobile-init .file-browser-panel {
 }
 
 /* ============================================================================
-   Phone Breakpoint (<430px)
+   Phone Breakpoint (<600px)
    ============================================================================ */
-@media (max-width: 430px) {
+@media (max-width: 599px) {
   /* Phones get a 44px header, up from 36px. Every header control is a touch
      target and 44px is the floor for one; the brand "C" that gets you home is
      the one that matters most. Redefined as the TOKEN rather than a literal so
@@ -499,7 +499,7 @@ html.mobile-init .file-browser-panel {
 
   /* Exception to the 26px shrink above: in sidebar layout this button is the
      ONLY way to open the session list — the strip it replaced is gone. A 26px
-     target is below --touch-target-min (44px), which the 430-768px block
+     target is below --touch-target-min (44px), which the 600-768px block
      already enforces for every other header button. */
   html[data-session-list='sidebar'] #sidebarToggleBtn {
     width: 44px;
@@ -1167,7 +1167,7 @@ html.mobile-init .file-browser-panel {
     }
   }
 
-  @media (max-width: 430px) {
+  @media (max-width: 599px) {
     .btn-case-settings-mobile {
       display: none !important;
     }
@@ -3144,7 +3144,7 @@ html:is([data-skin="paper-gray"], [data-skin="solarized-light"], [data-skin="cat
 
 /* Keyboard accessory bar + paste overlay base styles moved to styles.css
    (always loaded — covers iPad landscape where mobile.css doesn't load).
-   Phone-specific overrides remain in @media (max-width: 430px) above. */
+   Phone-specific overrides remain in @media (max-width: 599px) above. */
 
 /* ============================================================================
    iOS Safari Specific Fixes
@@ -3187,7 +3187,7 @@ html:is([data-skin="paper-gray"], [data-skin="solarized-light"], [data-skin="cat
   }
 }
 
-@media (max-width: 430px) {
+@media (max-width: 599px) {
   /* Attachment history (COD-18): full-screen sheet on phones */
   .attachment-history-drawer {
     top: 0;
@@ -3237,7 +3237,7 @@ html:is([data-skin="paper-gray"], [data-skin="solarized-light"], [data-skin="cat
    already reserves that space), so it needs the same safe-area padding as the
    other banners. The overlay is fixed and handles its own insets.
    ============================================================================ */
-@media (max-width: 430px) {
+@media (max-width: 599px) {
   .offline-banner {
     padding: 0.4rem 0.5rem;
     padding-left: calc(0.5rem + var(--safe-area-left));
@@ -3727,7 +3727,7 @@ html:is([data-skin="paper-gray"], [data-skin="solarized-light"], [data-skin="cat
    This whole file is served with media="(max-width: 1023px)", so these
    top-level rules cover the entire handheld range — deliberately NOT wrapped in
    a nested @media, because the two compact `.session-tabs` blocks above live in
-   `max-width: 768px` and `max-width: 430px` and would leave 769-1023px
+   `max-width: 768px` and `max-width: 599px` and would leave 769-1023px
    unhandled.
 
    Placement at the END of the file is load-bearing: the compact strip blocks at

src/web/public/session-ui.js

@@ -2526,7 +2526,7 @@ Object.assign(CodemanApp.prototype, {
       if (!input._mobileScrollWired) {
         input._mobileScrollWired = true;
         input.addEventListener('focus', () => {
-          if (window.innerWidth <= 430) {
+          if (window.innerWidth < 600) {
             setTimeout(() => input.scrollIntoView({ behavior: 'smooth', block: 'center' }), 300);
           }
         });

src/web/public/settings-ui.js

@@ -376,7 +376,7 @@ Object.assign(CodemanApp.prototype, {
     document.getElementById('appSettingsShowMultiMonitorButton').checked = settings.showMultiMonitorButton ?? defaults.showMultiMonitorButton ?? false;
     document.getElementById('appSettingsShowPlanUsageLimits').checked = this.planUsageChipEnabled(settings);
     document.getElementById('appSettingsShowRedrawButton').checked = settings.showRedrawButton ?? defaults.showRedrawButton ?? false;
-    // Phone overview home screen: only meaningful under 430px, so the row is
+    // Phone overview home screen: only meaningful under 600px, so the row is
     // hidden elsewhere rather than offering a toggle that changes nothing.
     // Spawn lineage lines: desktop-only (the overlay sits UNDER the fixed mobile
     // header), so the row is hidden elsewhere rather than offering a toggle that

src/web/public/styles.css

@@ -5156,7 +5156,7 @@ body.touch-device .terminal-container .xterm .xterm-helper-textarea {
 .run-mode-dot.shell { background: #94a3b8; }
 
 /* Phone-only Enter button (see index.html). Hidden by default at every width;
-   mobile.css turns it on inside @media (max-width: 430px), where it takes over
+   mobile.css turns it on inside @media (max-width: 599px), where it takes over
    the slot the Shell button occupies on wider screens. */
 .btn-toolbar.btn-enter {
   display: none;
@@ -11807,7 +11807,7 @@ kbd {
 }
 /* Footer row: the buttons are btn-toolbar (display: flex, block-level), so
    without this rule the four of them stack vertically. Mirrors the
-   runSummaryModal footer; the ≤430px block in mobile.css adds wrapping. */
+   runSummaryModal footer; the phone block (under 600px) in mobile.css adds wrapping. */
 .readmymind-modal .modal-footer {
   display: flex;
   justify-content: flex-end;
@@ -13184,7 +13184,7 @@ body.touch-device.cjk-input-visible .main {
    Keyboard Accessory Bar
    Base styles in styles.css (always loaded) so iPad landscape (≥1024px,
    where mobile.css doesn't load) still gets dark styling. Phone overrides
-   remain in mobile.css @media (max-width: 430px).
+   remain in mobile.css @media (max-width: 599px).
    ═══════════════════════════════════════════════════════════════ */
 
 .keyboard-accessory-bar {

src/web/public/terminal-ui.js

@@ -4842,7 +4842,7 @@ Object.assign(CodemanApp.prototype, {
     const viewportType =
       typeof MobileDetection !== 'undefined' && MobileDetection.getDeviceType
         ? MobileDetection.getDeviceType()
-        : window.innerWidth < 430
+        : window.innerWidth < 600
           ? 'mobile'
           : window.innerWidth < 768
             ? 'tablet'

test/home-sessions.test.ts

@@ -54,7 +54,7 @@ function loadHomeSessionsApp(overrides: Record<string, any> = {}, innerWidth = 1
       createElement: () => fakeElement(),
       createElementNS: () => fakeElement(),
     },
-    MobileDetection: { getDeviceType: () => (innerWidth < 430 ? 'mobile' : 'desktop') },
+    MobileDetection: { getDeviceType: () => (innerWidth < 600 ? 'mobile' : 'desktop') },
   });
   for (const file of ['constants.js', 'mobile-overview.js', 'home-sessions.js']) {
     vm.runInContext(readFileSync(resolve(PUBLIC, file), 'utf8'), context, { filename: file });

test/mobile-header-buttons-policy.test.ts

@@ -10,7 +10,7 @@
 //
 // Policy: every header button that is VISIBLE BY DEFAULT on desktop must have an
 // explicit decision for phones — either it's hidden via an @media (max-width:
-// 430px) display:none rule in mobile.css, or it's added to MOBILE_VISIBLE_ALLOWLIST
+// 600px) display:none rule in mobile.css, or it's added to MOBILE_VISIBLE_ALLOWLIST
 // below with a reason. A new default-visible header button with neither fails this
 // test, forcing the author to decide its mobile behavior.
 //
@@ -123,7 +123,7 @@ describe('Mobile header button policy (static guard)', () => {
         hidden || allowed,
         `Header button .${btn.distinguishing.join('.')} (id=${btn.id || '?'}) is VISIBLE BY DEFAULT but has ` +
           `no mobile-visibility decision.\n` +
-          `  → To hide it on phones: add it to the @media (max-width: 430px) "display: none" block in ` +
+          `  → To hide it on phones: add it to the @media (max-width: 599px) "display: none" block in ` +
           `src/web/public/mobile.css (next to .btn-settings / .btn-lifecycle-log).\n` +
           `  → To keep it visible on phones: add '${btn.distinguishing[0]}' to MOBILE_VISIBLE_ALLOWLIST in ` +
           `this test, with a reason.\n` +
@@ -137,7 +137,7 @@ describe('Mobile header button policy (static guard)', () => {
     for (const cls of KNOWN_PHONE_HIDDEN) {
       expect(
         phoneHidden.has(cls),
-        `${cls} must stay hidden on phones — restore its rule in the @media (max-width: 430px) ` +
+        `${cls} must stay hidden on phones — restore its rule in the @media (max-width: 599px) ` +
           `display:none block in src/web/public/mobile.css.`
       ).toBe(true);
     }

test/mobile-overview.test.ts

@@ -1,7 +1,7 @@
 // Port: none (pure model + static markup assertions — no browser, no server).
 //
 // The phone home screen (src/web/public/mobile-overview.js) replaces the welcome
-// overlay under 430px. Its grouping logic is the part that can silently go wrong:
+// overlay under 600px. Its grouping logic is the part that can silently go wrong:
 // a session blocked on a permission prompt landing in "idle" is exactly the bug
 // this surface exists to prevent. buildMobileOverviewModel() is pure for that
 // reason, so it can be exercised here against plain objects.

test/mobile-tab-tap-zones.test.ts

@@ -43,7 +43,7 @@ import { describe, expect, it } from 'vitest';
 const CSS = readFileSync(resolve(import.meta.dirname, '../src/web/public/mobile.css'), 'utf8');
 const ROOT = postcss.parse(CSS);
 /** The phone block. Tablets keep the roomier layout and are deliberately out of scope. */
-const PHONE_QUERY = '(max-width: 430px)';
+const PHONE_QUERY = '(max-width: 599px)';
 /** `.session-tab` border, from styles.css: `border: 1px solid transparent`. */
 const TAB_BORDER = 1;
 /**

test/mobile/README.md

@@ -89,11 +89,11 @@ Matching `app.js MobileDetection` and `mobile.css` media queries:
 
 | Breakpoint | Width | CSS Class | Header | Toolbar |
 |------------|-------|-----------|--------|---------|
-| **Phone** | ≤ 430px | `device-mobile` | Fixed at top | Fixed at bottom |
-| **Tablet** | 431–768px | `device-tablet` | Fixed at top | Relative (in flow) |
+| **Phone** | ≤ 599px | `device-mobile` | Fixed at top | Fixed at bottom |
+| **Tablet** | 600–768px | `device-tablet` | Fixed at top | Relative (in flow) |
 | **Desktop** | > 768px | `device-desktop` | Relative (in flow) | Relative (in flow) |
 
-Breakpoint boundaries (430px, 768px) use `max-width` which is **inclusive** — a 430px device is phone, a 768px device is tablet.
+The phone block is `max-width: 599px` and the tablet block starts at `min-width: 600px`, so a 599px device is phone and a 600px device (Nexus 7) is a small tablet in both CSS and the JS `getDeviceType()` cutoff (`< 600`). The tablet/desktop boundary (768px) is `max-width` inclusive: a 768px device is tablet.
 
 ## Architecture
 

test/mobile/device-matrix.test.ts

@@ -27,7 +27,7 @@ const BASE_URL = `http://localhost:${PORT}`;
 
 let server: WebServer;
 
-// Hidden on phones (< 430px width)
+// Hidden on phones (< 600px width)
 const PHONE_HIDDEN_SELECTORS = [
   SELECTORS.HEADER_BRAND,
   SELECTORS.CASE_SELECT_GROUP,
@@ -94,7 +94,7 @@ describe('Device Matrix', () => {
       const { width } = device.viewport;
       const position = await getCSSProperty(page, SELECTORS.TOOLBAR, 'position');
       if (width <= BREAKPOINTS.PHONE_MAX) {
-        // Phone (max-width: 430px includes 430): fixed toolbar
+        // Phone (max-width: 599px): fixed toolbar
         expect(position).toBe('fixed');
       } else {
         // Tablet/desktop: relative toolbar

test/mobile/devices.ts

@@ -26,7 +26,7 @@ export interface DeviceEntry {
 // ---------------------------------------------------------------------------
 
 function breakpointFor(width: number): 'phone' | 'tablet' | 'desktop' {
-  if (width < 430) return 'phone';
+  if (width < 600) return 'phone';
   if (width < 768) return 'tablet';
   return 'desktop';
 }

test/mobile/helpers/constants.ts

@@ -59,7 +59,7 @@ export const SELECTORS = {
 
 // Device breakpoints (match app.js MobileDetection)
 export const BREAKPOINTS = {
-  PHONE_MAX: 430,
+  PHONE_MAX: 599,
   TABLET_MAX: 768,
 } as const;
 

test/mobile/layout.test.ts

@@ -187,7 +187,7 @@ describe('Mobile Layout', () => {
       }
     });
 
-    it('does not render the desktop voice button at the 430px phone/tablet boundary', async () => {
+    it('does not render the desktop voice button on a 430px large phone', async () => {
       const device = REPRESENTATIVE_DEVICES['large-phone'];
       const { context, page } = await createDevicePage(device, BASE_URL, 'chromium');
       try {
@@ -331,7 +331,7 @@ describe('Mobile Layout', () => {
       }
     });
 
-    it('width < 430 adds device-mobile', async () => {
+    it('width < 600 adds device-mobile', async () => {
       const { context, page } = await createDevicePage(iPhone14Pro, BASE_URL);
       try {
         await assertDeviceClasses(page, iPhone14Pro.viewport.width);
@@ -340,7 +340,7 @@ describe('Mobile Layout', () => {
       }
     });
 
-    it('width 430-768 adds device-tablet', async () => {
+    it('width 600-768 adds device-tablet', async () => {
       const tablet = REPRESENTATIVE_DEVICES['small-tablet'];
       const { context, page } = await createDevicePage(tablet, BASE_URL);
       try {

test/mobile/visual-regression.test.ts

@@ -44,7 +44,7 @@ describe('Visual Regression', () => {
         isMobile: width < 768,
         hasTouch: width < 768,
         userAgent: 'Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/605.1.15',
-        expectedBreakpoint: (width < 430 ? 'phone' : width < 768 ? 'tablet' : 'desktop') as 'phone' | 'tablet' | 'desktop',
+        expectedBreakpoint: (width < 600 ? 'phone' : width < 768 ? 'tablet' : 'desktop') as 'phone' | 'tablet' | 'desktop',
         isIOS: true,
         defaultBrowserType: 'chromium' as const,
       };
@@ -71,7 +71,7 @@ describe('Visual Regression', () => {
         isMobile: width < 768,
         hasTouch: width < 768,
         userAgent: 'Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/605.1.15',
-        expectedBreakpoint: (width < 430 ? 'phone' : width < 768 ? 'tablet' : 'desktop') as 'phone' | 'tablet' | 'desktop',
+        expectedBreakpoint: (width < 600 ? 'phone' : width < 768 ? 'tablet' : 'desktop') as 'phone' | 'tablet' | 'desktop',
         isIOS: true,
         defaultBrowserType: 'chromium' as const,
       };
@@ -104,7 +104,7 @@ describe('Visual Regression', () => {
         isMobile: width < 768,
         hasTouch: width < 768,
         userAgent: 'Mozilla/5.0 (iPhone; CPU iPhone OS 18_0 like Mac OS X) AppleWebKit/605.1.15',
-        expectedBreakpoint: (width < 430 ? 'phone' : width < 768 ? 'tablet' : 'desktop') as 'phone' | 'tablet' | 'desktop',
+        expectedBreakpoint: (width < 600 ? 'phone' : width < 768 ? 'tablet' : 'desktop') as 'phone' | 'tablet' | 'desktop',
         isIOS: true,
         defaultBrowserType: 'chromium' as const,
       };
@@ -115,7 +115,7 @@ describe('Visual Regression', () => {
 
         // Open settings modal - try mobile button first, then desktop
         const mobileBtn = page.locator(SELECTORS.SETTINGS_MOBILE);
-        const isPhone = width < 430;
+        const isPhone = width < 600;
         if (isPhone && await mobileBtn.isVisible()) {
           await mobileBtn.click();
         } else {

test/readmymind-phone-key.test.ts

@@ -35,8 +35,8 @@ describe('read my mind phone key + alternates (static guards)', () => {
   const html = read('index.html');
   const ui = read('readmymind-ui.js');
   const settingsUi = read('settings-ui.js');
-  // Everything phone-specific lives in the max-width 430px block of mobile.css.
-  const phoneBlock = mobile.slice(mobile.indexOf('@media (max-width: 430px)'));
+  // Everything phone-specific lives in the max-width 599px block of mobile.css.
+  const phoneBlock = mobile.slice(mobile.indexOf('@media (max-width: 599px)'));
 
   it('ships the 🧠 key in BOTH accessory bar templates and routes it to the modal', () => {
     const simple = accessory.match(/_simpleButtons\s*:\s*`([\s\S]*?)`/)?.[1] ?? '';