feat(tray): left-click tray icon toggles show/hide main window

[gaursomya777-dev]

Problem

On multi-monitor or busy setups, users often lose track of whether AionUi is still running when the main window is hidden to tray. The tray icon only has a context menu — a single left-click does nothing on many Linux DEs / Windows setups, or behaves inconsistently with double-click.

Proposal

Make tray icon left-click (or double-click, platform-aware) toggle show/hide of the main window:

• If main window is visible → hide to tray
• If hidden / minimized → show + focus

This is the standard pattern in Discord / Slack / VS Code.

Implementation sketch

1. In packages/desktop/src/process/utils/tray.ts, wire tray.on('click') (Windows/Linux) and tray.on('double-click') as needed
2. Reuse existing showAndFocus / hideToTray helpers already in buildTrayContextMenu
3. macOS: keep click → menu (platform convention); optional preference later
4. Unit-testable pure toggle helper for visibility state

Campaign

Happy to implement under AionUi × Kimi once accepted as a bonus issue and assigned to me (gaursomya777-dev). Related discussion may already exist (#3688) — consolidating here for clarity.

[github-actions[bot]]

Thanks for posting! @IceyLiu will take a look soon. / 感谢发帖！@IceyLiu 会尽快跟进。

[IceyLiu]

Accepted, and thanks for the clear proposal + implementation sketch! ✅ Converted to a bonus issue and assigned to you as the implementer:

👉 #3725

The issue captures the acceptance criteria (left-click toggles show/hide on Windows/Linux, right-click keeps the existing menu, macOS unchanged, reuse the existing show/hide helpers + a unit-testable toggle). Feel free to drop your implementation plan on the issue before opening the PR. 🚀