feat: YaruWindowTitleBar implement

[airon-main]

Before:

After:

---

Summary by cubic

Added a custom Windows title bar with YaruWindowTitleBar, showing the Saber SVG icon and app title. Windows-only initialization and UI wrapper; macOS/Linux/other platforms are unchanged.

• Refactors
  • Run YaruWindowTitleBar.ensureInitialized() at startup in main.dart only on Windows.
  • Use MaterialApp.builder in ExplicitlyThemedApp to wrap with _WindowsTitleBarWrapper on Windows, composing with any existing builder.

Note: Saber is trialing Cubic AI code review. AI output may contain mistakes, misconceptions, and hallucinations. You can act on the AI feedback if you find it helpful and are sure it's correct; otherwise you can disregard it and wait for a human reviewer.

^{Written for commit daf93b6. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 2 files

Confidence score: 2/5

• There is a high-confidence, user-facing crash risk: lib/main.dart calls YaruWindowTitleBar.ensureInitialized() unconditionally, which can throw MissingPluginException on unsupported platforms like Android/iOS.
• Given the severity (8/10) and confidence (8/10), this is likely to cause runtime regressions on mobile builds, so this is not a low-risk merge in its current state.
• Pay close attention to lib/main.dart - gate platform-specific window initialization so unsupported platforms skip this call.

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[codecov]

Codecov Report

❌ Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.81%. Comparing base (f9859c5) to head (daf93b6).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/main.dart	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1763      +/-   ##
==========================================
+ Coverage   51.76%   51.81%   +0.04%     
==========================================
  Files         133      133              
  Lines        9467     9483      +16     
==========================================
+ Hits         4901     4914      +13     
- Misses       4566     4569       +3     

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[airon-main]

YO YARU IS GEM, HOW DIDN'T I KNOW THIS

[airon-main]

[adil192]

Your screenshots look nice, thanks. Just some nitpicks to address now

[adil192]

This should be moved into the await Future.wait([ block on line ~90 so it can be awaited in parallel to avoid slowing down app startup.
Also it should only run on Windows, not Linux/macOS.

[adil192]

This is a little inelegant, especially because we're passing the same arguments to ExplicitlyThemedApp each time. We should move this stuff into ExplicitlyThemedApp instead of DynamicMaterialApp to avoid repetition.

I'd recommend moving this widget tree into its own StatelessWidget for performance reasons. (Flutter can skip rebuilding a widget when its arguments remain the same.)

class _WindowsTitleBarWrapper extends StatelessWidget {
  const _WindowsTitleBarWrapper({required this.child});

  final Widget child;

  @override
  Widget build(BuildContext context) {
    return Scaffold(.....);
  }
}

And then in ExplicitlyThemedApp, pass builder like this:

  return MaterialApp.router(
    // ...
    builder: theme.platform == .windows
        ? (context, child) => _WindowsTitleBarWrapper(child: child)
        : null,
  );

[airon-main]

Was procastinating :(

[cubic-dev-ai]

1 issue found across 2 files (changes from recent commits).

<sub>Tip: Review your code locally with the cubic CLI to iterate faster.

Re-trigger cubic</sub>

[airon-main]