feat: Add option to trigger Loop via right-click while dragging a window

[atimoda]

Description

This PR introduces a new, highly ergonomic way to trigger the Loop radial menu: holding the right mouse button while dragging a window.

For users who already use their mouse to drag windows around, it's often more practical to just right-click to invoke Loop, rather than reaching for a keyboard keybind.

Changes included:

• Added a new RightClickWhileDraggingTrigger which activates the Loop menu when a user right-clicks while WindowDragManager.shared.isDraggingWindow is active.
• Added a new configuration toggle in Keybinds Settings: "Right-click to trigger while moving window", which is enabled by default.
• Fixed a bug in WindowDragManager where the drag state (resizeContext and isDraggingWindowMirror) was never reset on leftMouseUp if window snapping was disabled in settings. This previously caused the app to think a window was being dragged indefinitely after the first drag.
• Enhanced MouseInteractionObserver to track .leftMouseDragged and .rightMouseDragged events. Since macOS stops emitting .mouseMoved when mouse buttons are held, the radial menu direction selection was completely blind to mouse movements during a drag. Now, the radial menu smoothly tracks the cursor while dragging a window.

How has this been tested?

• Compiled the application and verified that clicking and dragging a window's title bar, followed by a right-click, successfully brings up the Loop radial menu.
• Verified that moving the mouse while holding both buttons properly highlights the different direction sections in the radial menu.
• Verified that releasing the right-click button closes the radial menu without affecting the window drag.
• Tested with "Window Snapping" disabled to ensure the WindowDragManager drag state properly resets on mouse release, preventing regular right-clicks from accidentally triggering the Loop menu.

Screenshots (if appropriate)

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation if applicable
• I have no unrelated changes in this PR.

Please describe to which degree, if any, an LLM was used in creating this pull request.

I collaborated with an AI coding assistant (Google Antigravity / Gemini) to write the Swift implementation for the new RightClickWhileDraggingTrigger, the settings UI additions, and the fixes to WindowDragManager and MouseInteractionObserver. I personally compiled, ran, and thoroughly manually tested all the resulting changes on my local macOS environment to ensure they work perfectly.