fix(island): ensure auto-close triggers on Linux and add manual close button

[Totopo27]

Summary

Fixes the issue where the island never auto-closes on Linux (KDE Plasma / GNOME) and provides a manual close button on the header as a reliable fallback.

Closes #136

Motivation & Root Cause

1. On Linux, CURSOR_POLL is disabled (false) and window input shapes are applied directly via platform::set_input_region to match the island shape. Moving the cursor off the island moves it outside the window's input shape, so WebKitGTK / GDK stops receiving mouse events. window.addEventListener("mouseout") with e.relatedTarget == null fails to fire under Wayland/X11 compositors when leaving the input region, leaving this.wasInIsland = true permanently.
2. When the island opened programmatically (alerts, task completion, or initial expansion), expand() reset this.homeCollapseAt = null, meaning the visual countdown never started unless the pointer first entered and exited the island.
3. In updateCountdown(), when remaining <= 0, it only zeroed the progress bar width without calling this.collapse().
4. While counting down to auto-close, this.frame would stop if no other animation was active (busy = false), halting updateCountdown entirely.

Key Changes

• windows/src/island/island.ts:
  • In followPageCursor(), listen to document.mouseleave, window.blur, and this.islandEl.mouseleave to reliably deliver (-10000, -10000) when the cursor leaves the island or window focus shifts.
  • In expand() and alert(), schedule this.homeCollapseAt whenever opened while !this.wasInIsland && !State.isPinned.
  • In updateCountdown(), call this.collapse() when remaining <= 0.
  • In the animation loop, keep busy = true while homeCollapseAt != null so the countdown bar smoothly renders down to 0 and collapses.
• windows/src/views/views.ts & windows/src/style.css:
  • Added a Close (Esc) button (ICONS.xmark) to .header-actions so users can instantly dismiss the island if needed.

Verification

• npx tsc --noEmit clean.
• npm run build completed cleanly.

[Louis-CFM]

Thank you! Auto-close on Linux is now handled on main by #160 (a pointer watch that only runs while the island is shown), extended to regular windows on GNOME/X11 (#307). The ✕ button isn't merged: it changes the shipped header, which the repo keeps as is. It will ship with the next Linux release.

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