feat(style): user-defined custom polish styles with editable system prompts

[katanumahotori]

User description

Why

The four built-in PolishModes (Raw / Light / Structured / Formal) all ship with hard-coded zh-CN system prompts. Users wanting a 'novel-writing', 'email', or 'casual chat' style had no way to register one, and Ctrl+Shift+S only cycled the four built-ins.

What

Turns PolishMode into a Custom(String) extensible enum (serde transparent via String, so the wire format stays compact) and adds a CRUD surface for user styles:

• UserPreferences.custom_modes: Vec<CustomMode { id, name, prompt }>
• add_custom_mode / update_custom_mode / delete_custom_mode IPC commands; delete falls back default_mode to Light if it was pointing at the deleted custom id.
• prompts::system_prompt(mode, override_text) accepts an override string used by Custom modes (built-ins still render the original ROLE/RULES/OUTPUT scaffolding when override_text is None).
• Style page: existing 4-mode grid stays, each card gets a 'view default prompt' disclosure that hits the new get_default_polish_prompt IPC. Below it, a new 'Custom styles' section with add / edit / delete UI; each custom mode participates in enabled_modes and the master toggle, and Ctrl+Shift+S cycles through them too.

Custom modes are picked by default_mode and the switch_style_hotkey listener exactly like built-ins, so no other call site needs to learn about them.

Note (scope leakage)

coordinator.rs and Style.tsx in this PR also contain the per-app override logic and UI (next PR's scope). They're bundled because they're the same files; the new Style.tsx 'Per-app override' section needs the AppModeOverride type from this PR's types.rs anyway. If reviewers prefer the override path stripped, that's a follow-up.

Depends on schema in #365 (or this PR can land first and #365 rebases).

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PR Type

Enhancement, Tests

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Description

• Add translateEnabled preference plumbing

• Add custom styles and app overrides

  • Serialize Rust and TypeScript types
  • Validate custom IDs before saving

• Route custom prompts through polish flow

  • Pick first matching app override
  • Pass custom prompts into composer

• Expand style UI, locales, and tests

  • Manage custom styles and overrides
  • Add five-language copy and fixtures

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Diagram Walkthrough

flowchart LR
  S["Style page"] -- "edits custom styles and overrides" --> I["IPC commands"]
  I -- "persists settings" --> P["UserPreferences (+ translateEnabled)"]
  P -- "selects app-specific mode" --> C["Coordinator"]
  C -- "builds override prompt" --> PR["Polish prompt composer"]
  S -- "uses translated labels" --> L["i18n locales"]

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File Walkthrough

	Relevant files
Enhancement	13 files types.rs Add custom modes and translate flag                                            +226/-8  polish.rs Support custom prompts in polish flow                                        +72/-9    commands.rs Add translation and custom mode commands                                  +175/-3  coordinator.rs Pick app overrides during dictation                                            +53/-17  lib.rs Register new Tauri commands                                                            +7/-0      Style.tsx Add custom style and override UI                                                  +693/-74 ja.ts Add Japanese copy for new settings                                              +54/-2    ko.ts Add Korean copy for new settings                                                  +52/-0    zh-TW.ts Add Traditional Chinese copy for new settings                        +52/-0    zh-CN.ts Add Simplified Chinese copy for new settings                          +52/-0    en.ts Add English copy for new settings                                                +52/-0    types.ts Mirror custom preferences and override types                          +39/-2    ipc.ts Add IPC wrappers for new settings                                                +37/-0
Tests	1 files stylePrefs.test.ts Update mocked preferences for new fields                                  +3/-0

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[github-actions]

PR Reviewer Guide 🔍

(Review updated until commit 3eab896)

Here are some key observations to aid the review process:

🎫 Ticket compliance analysis 🔶 365 - Partially compliant Compliant requirements: Add a master Enable translation preference toggle that defaults to true. Persist the toggle through a set_translate_enabled IPC command. Non-compliant requirements: Add the toggle row and explanatory copy in the Translation settings UI. Requires further human verification: Verify the translation hotkey registration and overlay suppression behavior in the running app. Verify the new settings row and translated labels render correctly across all supported locales.

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Stale overrides After deleting a custom style, the page refreshes prefs but leaves the local overrides state unchanged. If any per-app rules referenced that style, the UI can keep showing a now-deleted custom:<id> and the next debounced save can try to persist the stale reference, which the backend will reject. Refresh overrides from the reloaded preferences here as well. await deleteCustomMode(cm.id); const fresh = await getSettings(); setPrefs(fresh); setSaveError(null);

[appergb]

@katanumahotori Deleting a custom style only removes it from custom_modes, enabled_modes, and default_mode. Any app_mode_overrides entries that still point to that custom ID are retained, so the application might select a mode that no longer exists when matching, ultimately leading to an empty or corrupted path. 覆盖修改仅通过 500 毫秒的防抖机制保存，但卸载清理操作只是清除计时器，而不是刷新它。如果用户更改了应用程序覆盖设置并在该时间窗口内离开页面，则最后一次编辑将被丢弃，并且永远不会被保存。

[katanumahotori]

Thanks for the careful review. Both issues fixed:

1. Dangling app_mode_overrides after custom style delete:
   delete_custom_mode now also walks app_mode_overrides and removes any entry whose mode == Custom(deleted_id). The persisted preference is consistent after delete; no app match path can resolve to a non-existent custom id.

2. Debounced edits dropped on unmount:
   The 500ms debounce in Style.tsx now stores the latest pending override list in a ref. The useEffect cleanup checks the ref and, if there's a pending unsaved value, calls setAppModeOverrides(pending) synchronously before clearing the timer. So leaving the page mid-edit always persists the last keystroke.

Please re-review.

[github-actions]

Persistent review updated to latest commit 3eab896