fix: restore tray-hidden windows

[SeanTong11]

Summary

This fixes two tray-related window restore issues:

• Restores the main window correctly when it is minimized but still reported as visible.
• Clears stale titlebar hover/focus state after restoring the window from the tray.

Problem

When system tray support and close-to-tray are enabled, but minimize-to-tray is disabled, the main window can enter states that are not handled correctly by the current tray restore logic.

Case 1: minimized window does not restore from tray

Configuration:

• Always on top: enabled
• System tray: enabled
• Close to tray: enabled
• Minimize to tray: disabled

Steps:

1. Minimize the main window.
2. Click the tray icon.

Expected:

The main window should be restored and focused.

Actual:

The window may remain hidden/minimized because the tray click handler only checks is_visible(). On some platforms a minimized window can still be reported as visible, so the handler chooses hide() instead of restore.

Case 2: close button remains visually selected after tray restore

Configuration:

• Always on top: enabled
• System tray: enabled
• Close to tray: enabled
• Minimize to tray: disabled

Steps:

1. Click the window close button.
2. The window is hidden to tray.
3. Click the tray icon to restore it.

Expected:

The restored window should not keep the close button in a hover/focus-like visual state, and pressing Enter should not trigger the previously focused close button.

Actual:

The close button can remain visually highlighted/red after restore, and the focused control state is not cleared.

Changes

• Adds a small TrayWindowAction decision helper that treats minimized windows as restore targets.
• Restores hidden/minimized windows with show(), unminimize(), and set_focus().
• Applies the same restore behavior to the tray menu Show action.
• Adds unit tests for the tray click decision matrix.
• Clears stale titlebar focus/hover state before minimizing or closing.
• Suppresses titlebar hover visuals until the user moves the pointer again after restore.
• Keeps keyboard focus visibility via :focus-visible.

Testing

Tested manually on Windows:

• Minimize the window, then click the tray icon: the window restores correctly.
• Close to tray, then click the tray icon: the window restores without the close button staying red/selected.
• Pressing Enter after restore no longer closes the window via stale close-button focus.

Commands run:

cargo test --manifest-path src-tauri/Cargo.toml tray_click
npm run check

[Splode]

Looks good, and thank you for the contribution!