feat: remove native titlebar on Linux for custom titlebar support

[yujonglee]

Summary

Removes the native window decorations (titlebar) on Linux by adding decorations(false) to the window builder, matching the existing behavior on Windows. This allows the app to display a custom titlebar similar to the macOS version instead of the default Linux window manager titlebar.

The change follows the existing pattern in plugins/windows/src/window/v1.rs where macOS uses overlay titlebar style and Windows already disables decorations.

Local Testing Result

Tested locally on Linux - the native titlebar is successfully removed:

Review & Testing Checklist for Human

• Test on Linux: Verify the native titlebar is removed and the custom titlebar renders correctly
• Window dragging: Confirm window can be dragged using the custom titlebar areas (elements with data-tauri-drag-region)
• Window controls: Verify minimize, maximize, and close functionality works (may need custom controls if not already implemented)
• Window resizing: Test that window resizing from edges still works correctly

Notes

• The frontend already has data-tauri-drag-region attributes in place for window dragging
• Also fixed a pre-existing CI issue: removed unused cn import in apps/desktop/src/components/main/sidebar/search/index.tsx
• Reference: https://v2.tauri.app/learn/window-customization/

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Requested by: yujonglee (@yujonglee)

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📝 Walkthrough

Walkthrough

Adds a Linux-specific conditional to AppWindow::window_builder that disables window decorations, and removes an unused cn import from the sidebar search component.

Changes

Cohort / File(s)	Summary
Linux window decorations plugins/windows/src/window/v1.rs	Adds a #[cfg(target_os = "linux")] block in AppWindow::window_builder that sets decorations(false), matching the existing Windows behavior.
Remove unused import apps/desktop/src/components/main/sidebar/search/index.tsx	Deletes an unused cn import from @hypr/utils; no other code or behavior changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

• Attention points:
  • plugins/windows/src/window/v1.rs: verify conditional compilation and that disabling decorations on Linux is intended across desktop environments.
  • apps/desktop/src/components/main/sidebar/search/index.tsx: confirm no other references to cn remain.

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: removing native titlebar on Linux for custom titlebar support, which matches the primary modification in the changeset.
Description check	✅ Passed	The PR description clearly relates to the changeset by explaining the addition of decorations(false) for Linux and the removal of unused imports.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch devin/1764209930-linux-custom-titlebar

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