feat(startup): add "start minimized" toggle (Windows background autostart)

[appergb]

User description

What

回应用户：「Windows 端增加一个在开机启动的时候不弹出软件界面、自动在后台启动的开关」。

新 pref `start_minimized: bool`，默认 false 不破坏现有行为。打开后所有启动路径都不弹主窗口（包括开机自启 + 手动启动），App 仅在菜单栏 / 托盘运行；用户从托盘进入主窗口。

Why this design (单开关，不区分启动来源)

最 surgical 的实现是 "prefs.start_minimized = true → 跳过 main.show()"，不区分自启动 vs 手动启动。

如果非要区分（"只在自启动时静默、手动启动仍弹窗"）：

• 需要 autostart 注册 `--silent` arg → tauri-plugin-autostart 的 args 是 `init()` 时静态设、动态切需要重注册
• App 启动读 argv 检测自启动 → 加一层路径分叉
• 既存 autostart 用户不会自动获得新 arg，需要先 disable + re-enable autostart

复杂度跟收益不成比例。简单设计：开关一开就所有启动统一静默，用户接受"从此从托盘进主窗口"的契约。开机自启场景下这正是想要的；手动启动场景下也容易接受（点托盘比一直关主窗口轻）。

Files

• `types.rs`: `UserPreferences::start_minimized`（UserPreferencesWire + Default + Deserialize 全套兼容）
• `lib.rs` setup hook: 读 `coordinator.prefs().get().start_minimized` 决定跳不跳过 `main.show()`。`OPENLESS_SHOW_MAIN_ON_START=1` 优先级高于 prefs（dev 用的强制 show 路径不变）
• 前端 `types.ts` / `ipc.ts mockSettings` / `stylePrefs.test.ts`: 加默认 false
• `Settings.tsx` Recording 区在 `` 之后加 Toggle
• i18n 5 locale 加 `startMinimizedLabel` + `startMinimizedDesc`

顺手修预存 bug

HotkeyBinding default keys=None（跟 PR #355 副 commit 同源——本 branch 没含那个修复）。避免旧 prefs 反序列化时 trigger / keys 不一致导致快捷键失效。`types::tests` 8/8 pass。

不在本 PR：Windows IME 切换还原偶发 bug

用户也报了「使用 OpenLess 后输入法应自动切回之前的 IME，部分系统正常、部分不正常」。

这一条不能盲改：是个偶发 bug，需要：

• Windows 版本（设置 → 系统 → 关于 → "Windows 规格"）
• 出问题时的 IME（微软拼音 / 搜狗 / Rime / etc）
• `%LOCALAPPDATA%\OpenLess\Logs\openless.log` 出问题前后约 30 秒（关键字 `[ime]` / `restore_profile` / `activate_openless_profile`）
• 复现步骤

已请求用户提供。拿到数据后单独开 PR 修。

验证

```
cargo test --lib: 135/135 pass
npm run build: tsc + vite 干净
cargo check: 干净（79 warnings 均预存）
```

无法在 macOS 上实测 Windows 行为；setup hook 中 `prefs.start_minimized` 读取 + `main.show()` 跳过逻辑跨平台一致，理论上 Windows 同样生效。

Test plan

• Windows：装新 build，设 start_minimized = true，重启电脑（或手动启动）→ 应仅托盘图标，主窗口不弹出
• Windows：设 start_minimized = true 后双击启动器 → 仍仅托盘图标
• Windows：设 start_minimized = false（默认）→ 启动行为跟历史一致（弹主窗口）
• macOS：同上 3 条
• 任意平台：托盘图标点击 → 主窗口正常弹出（依赖现有 `show_main_window` 路径，没改它）

---

PR Type

Enhancement

---

Description

• Add start_minimized boolean preference (default false)

• Suppress main window show on launch when enabled, keeping only tray icon

• Expose toggle in Recording settings with i18n for 5 locales

---

Diagram Walkthrough

flowchart LR
  Settings["Settings.tsx toggle"] -- "set pref" --> Prefs["UserPreferences.start_minimized"]
  Prefs -- "read on launch" --> Lib["lib.rs setup"]
  Lib -- "skip main.show()" --> Tray["Tray/menu bar only"]

Loading

File Walkthrough

	Relevant files
Enhancement	4 files lib.rs Suppress main window show when start_minimized is set        +11/-1    types.rs Add start_minimized field to UserPreferences and wire        +10/-0    types.ts Add start_minimized to frontend preferences type                  +3/-0      Settings.tsx Add toggle for start minimized in Recording settings          +8/-0
Configuration changes	6 files en.ts Localize start minimized label and description (English)  +2/-0      ja.ts Localize start minimized label and description (Japanese) +2/-0      ko.ts Localize start minimized label and description (Korean)    +2/-0      zh-CN.ts Localize start minimized label and description (Simplified Chinese) +2/-0      zh-TW.ts Localize start minimized label and description (Traditional Chinese) +2/-0      ipc.ts Add start_minimized default in mock preferences                    +1/-0
Tests	1 files stylePrefs.test.ts Update preference fixture with start_minimized default      +1/-0

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit f6474be)

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis 🔶 355 - Partially compliant Compliant requirements: Add frontend type updates, settings controls, and localized labels/help text for the new recording preferences. Non-compliant requirements: Add time-based history retention while keeping the existing 200-entry cap. Add a history retention days preference in Settings → Recording, defaulting to 7. Add HistoryStore::append_with_retention(session, retention_days) to prune old entries on write. Add HistoryStore::recent_within_minutes(minutes) for newest-first recent history lookup. Extend polish to accept prior turns and use multi-turn chat completion when context is present. Skip prior-turn context for translation, raw, and repolish paths. Refactor chat completion request sending/parsing so single-turn and multi-turn paths share logic. Preserve legacy hotkey compatibility and keep existing tests passing. Requires further human verification: None

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

[github-actions]

Persistent review updated to latest commit f6474be