feat: add right-click activation for tiling system with Wayland support

[tho-maj]

Overview

This PR adds the option to activate the tiling layout by holding the Right Mouse Button while dragging a window. This has been integrated as a new option in the "Activation Key" settings.

Implementation Details & Wayland Support

Implementing this for Wayland was challenging due to Mutter's grab behavior. This PR includes a robust solution for the following issues:

1. Immediate Grab Termination: On Wayland, clicking RMB while holding LMB (dragging) causes the window manager to instantly terminate the official grab-op.
2. Manual Tracking Strategy: To keep the tiling interaction fluid, I implemented a "manual tracking" mode (_isRMBInterrupted). When the official grab is interrupted, the window now continues to follow the cursor manually using stored offsets until the Left Mouse Button is released.
3. State Latching: Introduced _isManualSnap to ensure the tiling logic correctly finalizes the snap even after the official grab state has ended.
4. Button Mapping: Added support for both BUTTON2_MASK and BUTTON3_MASK to account for environment-specific mapping variations during window moves.
5. Geometry Correction: Ensured windows are explicitly unmaximized and moved with user_op: true during the final snap to guarantee the correctly adopt the tile dimensions.

Testing

• Tested on GNOME 47/48 (Wayland).
• Verified that hover colors reset correctly when leaving the grid.
• Verified that windows can still be moved partially off-screen during the manual tracking phase.