feat: add tauri-plugin-shortcut with centralized shortcut registry

[devin-ai-integration]

feat: add tauri-plugin-shortcut with centralized shortcut registry

Summary

Creates a new tauri-plugin-shortcut Rust plugin that serves as the single source of truth for all keyboard shortcuts in the app. The Rust side declares all shortcuts; the TS side reads from the registry and registers handlers as needed.

Rust side (plugins/shortcut/):

• ShortcutId enum with #[serde(rename_all = "snake_case")] — all 35 shortcut identifiers as type-safe enum variants, exported via specta as a TS string literal union
• ShortcutDef struct with typed id: ShortcutId, keys, category, description, scope (Global vs Scoped)
• Static registry of all shortcuts in registry.rs
• Single get_all_shortcuts command exposed via specta

TS side:

• ShortcutId type generated by specta — compile-time enforcement that all shortcut references are valid
• useShortcutRegistry hook — shared React Query fetch with keysMap for O(1) lookup by ShortcutId
• useShortcutKeys(id: ShortcutId) — convenience hook to read a single key binding from the registry
• useScopedShortcut(id, handler, options?, deps?) — wrapper hook that combines useShortcutKeys + useHotkeys into a single call, automatically guarding with enabled: !!keys
• useGlobalShortcuts hook reads all key bindings from the registry via k(id: ShortcutId) helper (no hardcoded key strings)
• All scoped shortcuts (toggle_sidebar, focus_search, open_note_dialog, switch_to_enhanced/raw/transcript, prev/next_panel_tab, transcript_search, play_pause_audio, undo_delete) use useScopedShortcut — no more manual useShortcutKeys + useHotkeys two-step pattern
• Scoped shortcuts remain in their original components — they are NOT moved to global scope
• The old useTabsShortcuts function (~225 lines in body/index.tsx) is removed; its logic now lives in useGlobalShortcuts

CI:

• Added tauri-plugin-shortcut to the Windows CI exclude list in desktop_ci.yaml

Review & Testing Checklist for Human

• Verify shortcuts work after app launch — all shortcuts now depend on async getAllShortcuts() resolving via React Query. Until the query completes, shortcuts are disabled. Open the app and confirm shortcuts activate within ~1s. This is a behavioral change from the old synchronous registration.
• Test ALL global shortcuts — mod+n, mod+t, mod+w, mod+1-9, mod+alt+left/right, mod+shift+t/c/o/comma/l/f/n, mod+j, mod+,
• Test scoped shortcuts in their correct context — mod+\ (sidebar), mod+k (search), mod+o (empty tab), mod+f (transcript), alt+s/m/t (editor tabs), ctrl+alt+left/right (panel nav in note-input), space (audio playback), mod+z (undo delete)
• Verify mod+w close-while-listening behavior — complex branching (listening → confirmation, pinned → unpin, chat_support → CLOSE event, else → close). Logic was moved from useTabsShortcuts in body/index.tsx to useGlobalShortcuts in a different component context.
• Verify mod+, splitKey special case — this shortcut uses splitKey: "|" option in useGlobalShortcuts. Confirm it still works through the registry.
• Verify useScopedShortcut wrapper works correctly — especially for shortcuts with custom options like enableOnFormTags: false (play_pause_audio) or complex handlers

Recommended test plan: Open the app, create tabs of different types (empty, note, calendar, session with active listening), and systematically test each shortcut. Pay special attention to shortcuts with complex logic (mod+w) and scoped shortcuts that should only work in specific contexts.

Notes

• The Rust registry is now the authoritative source for all key bindings. TS reads from it dynamically rather than hardcoding strings.
• Type safety: The ShortcutId enum provides compile-time validation that all shortcut references are valid. Typos in shortcut IDs are now caught at build time rather than silently failing at runtime.
• useScopedShortcut wrapper: Simplifies scoped shortcut registration by combining useShortcutKeys + useHotkeys into one call. Automatically sets enabled: !!keys to prevent invalid handlers.
• Startup race condition: Shortcuts are disabled (enabled: false) until the registry query completes. This prevents useHotkeys("") from registering invalid handlers, but means there's a brief window (~1s) on app launch where no shortcuts work.
• Scoped shortcuts remain in their original components for proper context scoping, but now read their key bindings from the Rust registry.
• The old useTabsShortcuts function was removed from body/index.tsx; its logic now lives in useGlobalShortcuts in _layout.tsx.

Link to Devin run: https://app.devin.ai/sessions/b4eb1d2ab0224f56b5f02c120d5531f4
Requested by: @yujonglee

[devin-ai-integration]

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