Fix: resolve Wayland dead zone by decoupling input region into a dedicated hitbox

[MakdumIbrohim]

Fix: Wayland Phantom Window / Dead Zone (Unclickable Screen Area)

The Problem

Users on Wayland experience a "phantom window" or "dead zone" at the bottom of the screen where mouse clicks are not registered by applications behind the dock.

Root Cause:

1. Giant Main Container Hitbox: To prevent bounce/magnify animations from being clipped, the main container (this) is given a large footprint (fp). Because affectsInputRegion: false was disabled/commented out during addChrome, Wayland treats this entire large transparent box as a compositor input region, swallowing mouse clicks.
2. Full-width Struts Hitbox: When autohide_dash is disabled, this.struts stretches full-width across the screen to act as a window manager strut (preventing maximized windows from overlapping). Since it also lacked affectsInputRegion: false, it created a massive full-width horizontal dead zone.
3. Fullscreen Block: this.struts was configured with trackFullscreen: false, meaning the invisible struts remained on top of fullscreen windows (like movie players), blocking playback controls.

The Solution (Architectural Fix)

This PR completely decouples the visual layout/animations, the window manager struts, and the Wayland input region (hitbox):

1. Introduced a Dedicated Hitbox (this.hitbox)

   • Created a new transparent actor specifically for handling the input region.
   • Its size and position are dynamically updated in animator.js to strictly match the exact bounds of the visual dock (dock._background).
   • Added to Chrome with affectsInputRegion: true.

2. Disabled Input Region on Large Containers

   • Added affectsInputRegion: false to the main container (this). The large footprint (fp) now safely provides room for animations without blocking Wayland clicks.
   • Added affectsInputRegion: false to this.struts. It continues to successfully push maximized windows away, but no longer intercepts mouse clicks across the full screen width.

3. Fixed Fullscreen Interference

   • Set trackFullscreen: true on this.struts and this.hitbox so they properly sink below fullscreen applications, allowing users to click video player controls.

4. Cleaner Debug Mode

   • Updated the debug_visual logic so that the magenta debug outline .hi only highlights the actual this.hitbox instead of drawing confusing giant boxes for the struts and main containers.

✅ Testing Done

• Click-through works perfectly on empty transparent areas around the dock.
• Hover, Magnify, and Bounce animations work flawlessly and are not clipped.
• Fullscreen apps/videos are no longer blocked by invisible boxes.
• Tested on Wayland session.