fix(mobile): inkSubtle 三主题达 WCAG AA 对比度

[DeliciousBuding]

背景

移动端 inkSubtle 在三主题上均低于 WCAG AA 4.5:1：dark/oled #666875 在 canvas 上仅 2.92:1，light #8a8d98 仅 3.12:1。inkSubtle 被 ListRow、TasksScreen、ChatScreen、SearchField（placeholder）、ThreadsScreen 等 17 处消费点用于 meta/caption 文本。component-acceptance.md §4 明确「muted 文本不低于 4.5:1」。同时这是 token 漂移——web --text-3 已有 AA 注释。

变更

• app/mobile-rn/src/theme/tokens.ts：dark/oled inkSubtle 从 #666875 提到 #8a8d98（dark canvas 4.90:1，oled canvas 6.34:1）；light 从 #8a8d98 降到 #6b6e78（4.65:1）。三主题均 ≥ 4.5:1 且保持 ink > inkMuted > inkSubtle 层级。
• app/mobile-rn/src/theme/tokens.test.ts：新增 hexToRgb/relativeLuminance/contrastRatio WCAG 计算器与 keeps inkSubtle at or above WCAG AA contrast (4.5:1) on canvas for every theme 断言，防止未来回归。

证据

• real_tested=false：单元测试覆盖对比度数学；未在真机/模拟器截图。
• 本地门禁：corepack pnpm --filter agenthub-mobile-rn test（351 passed, 27 files）全绿。

关联

审计 P0-2：mobile inkSubtle 对比度不达 AA。

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Reviewing files that changed from the base of the PR and between ab7559d and 69e9697.

📒 Files selected for processing (2)

• app/mobile-rn/src/theme/tokens.test.ts
• app/mobile-rn/src/theme/tokens.ts

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