fix(app): restore persisted settings state

[murongg]

Summary

• restore the persisted workspace sidebar expanded/collapsed state during file tree startup
• prevent late initial settings loads from overwriting live settings updates
• add regression coverage for sidebar state restore and late settings-load races

Why

• Windows could show the sidebar in the default state even when fileTreeOpen had been saved.
• Settings hooks could briefly accept a live user/cross-window update, then be overwritten by an older async startup read.

Validation

• pnpm --filter @markra/app test -- useEditorPreferences.test.tsx useAiSettings.test.tsx useMarkdownFileTree.test.tsx App.test.tsx passed: 185 tests
• pnpm --filter @markra/app test -- workspace-state.test.ts settings-events.test.ts passed: 19 tests
• pnpm --filter @markra/app typecheck:test passed

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jun 19, 2026 4:15am