feat: Focus mode reminder when recording without DND

[StevenLi-phoenix]

Summary

• Add FocusModeService (nonisolated enum) that checks macOS Focus/DND status via INFocusStatusCenter
• Add FocusReminderBanner overlay in ContentView shown when recording starts without Focus mode active — includes "Open Settings" (opens Focus system preferences), dismiss, and "don't remind again" buttons
• Add focusReminderEnabled toggle in Recording settings tab
• 6 tests covering status API, defaults behavior, and setting-gated logic

Test plan

• Build succeeds (CODE_SIGNING_ALLOWED=NO)
• FocusModeServiceTests — 6/6 pass
• Manual: start recording with Focus off — banner appears
• Manual: dismiss banner — disappears with animation
• Manual: "Don't remind again" — persists across recordings
• Manual: toggle off in Settings > Recording — no banner on next recording
• Manual: "Open Settings" button opens System Settings Focus pane

Closes #103

[claude]

❌ Claude Code Review: REJECT

FocusModeService.requestAuthorization() never calls INFocusStatusCenter.default.requestAuthorization() (it just reads isFocused), and the required com.apple.developer.focus-status entitlement is not added to the entitlements file — meaning isFocused will always be nil, currentStatus() will always return .unknown, and shouldShowReminder() will always return false, so the banner will silently never appear.

[github-actions]

⚠️ Auto-merge skipped: Claude Code review did not approve. Manual review required.

[StevenLi-phoenix]

Notes — Focus Mode Reminder (#103)

232 行、6 文件——轻量但高价值。

1. INFocusStatusCenter

INFocusStatusCenter 是正确的 API。注意：

• 需要 com.apple.developer.focus-status entitlement
• 用户需要在 System Settings > Focus > Share Across Devices 中授权 app 读取 Focus 状态
• 首次检查时可能需要权限请求

2. Banner 设计

"Open Settings" + dismiss + "Don't show again"三个操作覆盖了所有用户意图。

建议补充第四个选项："Auto-enable DND"——直接为用户开启 Focus 模式（通过 INFocusStatusCenter 或 Shortcuts automation）。这需要用户预先在 System Settings 中配置 Shortcuts 触发器。

3. 与 Meeting Templates 集成

PR #101 的模板可以指定"此模板总是启用 Focus"——面试模板、保密会议模板等。FocusModeService.shouldRemind() 可以检查模板配置。

4. 通知声录入问题

Focus mode 的核心价值：录音过程中通知声会被 ASR 捕获，影响转录质量。这一点建议在 banner 文案中明确告知用户——"通知声可能被录入音频"比"建议开启勿扰"更有说服力。

5. 持久化

"Don't show again" 用 @AppStorage 存储——后续可以在 Settings 中重新开启。确认 key 名称与项目约定一致（如 focusReminderDismissed）。

[StevenLi-phoenix]

Focus Mode 集成路径

macOS 的 Focus 状态检测有权限限制。最低成本的实现：

1. 使用 DistributedNotificationCenter 监听 DND 状态变化通知
2. 录音开始时检查并显示 NSAlert 建议开启 DND
3. 不需要额外的 entitlement 或系统扩展
4. 与 Focus 模式集成 — 自动暂停通知 (Focus Mode Integration) #103 Implementation Plan 保持一致