fix(app): swap conflicting keyboard shortcuts

[murongg]

Summary

• Normalize shortcut capture and matching through physical key codes for shifted digit and punctuation keys.
• Preserve physical key data when menu and toolbar actions synthesize editor shortcuts.
• Swap an existing shortcut when recording a chord already used by another action, avoiding silent rollback on conflicts.

Why

• Fixes [Feature]: 关于快捷键修改的问题 #373.
• Cmd/Ctrl+Shift+8 can arrive as key="*" with code="Digit8", so matching only event.key misses the saved Mod+Shift+8 binding.
• Settings capture previously normalized duplicate shortcuts back to defaults, which made a conflicting shortcut look like it was not recorded.

Validation

• pnpm --filter @markra/shared test -- keyboard-shortcuts.test.ts
• pnpm --filter @markra/app test -- KeyboardShortcutsSettings.test.tsx useNativeBindings.test.tsx MarkdownPaper.test.tsx
• pnpm --filter @markra/app build
• pnpm --filter @markra/shared build
• pnpm --filter @markra/editor build

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jun 22, 2026 1:30am