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

[IceyLiu]

Background

Originally proposed in Discussion #3718 by @gaursomya777-dev.

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

Acceptance criteria

1. Left-click the tray icon toggles the main window (Windows / Linux):
   • visible → hide to tray
   • hidden / minimized → show + focus
2. Right-click still opens the existing context menu (unchanged).
3. macOS keeps the platform convention (click → menu); do not change macOS behavior.
4. Reuse the existing show/hide helpers in tray.ts (showAndFocus / hideToTray or equivalent) rather than duplicating logic.
5. A unit-testable pure toggle helper for the visibility state.
6. No AionCore / data-layer changes — main-process (tray.ts) only.

Scope

packages/desktop/src/process/utils/tray.ts + a small pure helper + tests. Matches the standard pattern in Discord / Slack / VS Code.

Related

• Discussion: feat(tray): left-click tray icon toggles show/hide main window #3718

[github-actions]

🎁 This issue is part of the AionUi × Kimi contributor campaign — merge 3 campaign PRs, get a free Kimi Allegretto plan ($39/mo value).

To claim this issue:

1. Comment below with your fix approach (a brief plan is enough)
2. If it looks good, @IceyLiu will assign it to you
3. Submit your PR referencing this issue (Fixes #3725)

📋 Full rules: https://x.com/AionUi/status/2079493379914961069
🙋 Claim your reward: #3640

[gaursomya777-dev]

Claim — plan ready

Hi @IceyLiu — I'd like to take #3725 for the AionUi × Kimi campaign. Please assign me (gaursomya777-dev).

Plan

1. On Windows/Linux, left-click tray icon toggles main window show/hide (instead of always show).
2. Keep right-click context menu behavior unchanged.
3. macOS: leave as-is (menu bar click conventions differ) unless you want parity.
4. Unit tests for the toggle path.
5. Related proposal: Discussion feat(tray): left-click tray icon toggles show/hide main window #3718 — branch feat/tray-click-toggle-show-hide already implemented + tests green; ready to open PR as soon as assigned.

Thanks!

[gaursomya777-dev]

PR ready: #3726 — implements the acceptance criteria from this issue (branch rebased on latest main, unit tests green). Please assign me so it counts for the campaign. Thanks @IceyLiu !