feat(app): add document replace shortcut

[murongg]

Summary

• Add platform-native document replace shortcuts: Ctrl+H on Windows/Linux and Cmd+Option+F on macOS.
• Support macOS Cmd+Option+F even when Option changes the reported key value.
• Leave macOS Ctrl+H Backspace/delete behavior alone.
• Add a hover title to the case-sensitive Aa button in the document search bar.
• Reserve Mod+H from configurable shortcuts so custom app shortcuts do not collide with native H shortcuts.
• Cover the shortcut, macOS key event compatibility, tooltip, and reserved-shortcut behavior with tests.

Validation

• pnpm --filter @markra/shared exec vitest run src/keyboard-shortcuts.test.ts --environment jsdom --globals
• pnpm --filter @markra/app exec vitest run src/hooks/useNativeBindings.test.tsx
• pnpm --filter @markra/app exec vitest run src/App.test.tsx
• pnpm --filter @markra/shared build
• pnpm --filter @markra/app build

Notes

• Default Markra shortcuts do not conflict: document history remains Mod+Shift+H.
• On macOS, use Cmd+Option+F for document replace; Ctrl+H remains the text-system Backspace/delete behavior.
• Global search is left unchanged because it currently has search-only behavior; a global replace shortcut would need a separate workspace replace design.

Closes #208

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jun 5, 2026 11:07am