fix(desktop): restore Windows titlebar double-click toggle

[murongg]

Summary

• Route Windows self-drawn titlebar double-click mouse downs through the existing window maximize toggle handler.
• Avoid intercepting interactive titlebar targets such as buttons, tabs, menu items, and titlebar action controls.
• Add coverage for the Windows app chrome and document titlebar double-click paths.

Why

• On Windows, double-clicking the self-drawn titlebar could maximize the app, but a second double-click did not reliably restore it.

Validation

• pnpm --filter @markra/app test -- NativeTitleBar.test.tsx passed: 38 tests.
• pnpm --filter @markra/app typecheck:test passed.

Risk

• Low. The handler is only attached inside the Windows titlebar branch and only handles native-window-chrome left-button double-click mouse downs outside interactive controls.

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jun 19, 2026 3:01am