Enhance WindowPosition Addon with Adaptive Tracking

[tobiu]

Refactor src/main/addon/WindowPosition.mjs to support high-frequency, adaptive position tracking. This replaces the legacy mouseout polling with a robust focus/blur strategy, enabling real-time window tracking for the "Infinite Canvas" feature.

Tasks:

1. Adaptive Loop: Implement startTracking() (on focus) and stopTracking() (on blur) methods.
2. Loop Logic: In the tracking loop (~16ms), check window.screenX/Y and outerWidth/Height.
3. Delta Updates: Only send windowPositionChange messages to the App Worker if the values have effectively changed.
4. Cleanup: Deprecate or refactor the legacy mouseout logic to rely on this new, more reliable strategy.
5. Configurability: Ensure this behavior is active for all windows (or configurable via Neo.config).

Note: This enhancement is the "Client-Side Reporter" for the multi-window coordinate system.

[tobiu]

Input from Gemini 2.5:

✦ Architecture Update:

The user has provided a "Heuristic Tracking" strategy to further optimize the polling mechanism. We will implement this inside Neo.main.addon.WindowPosition.

Logic:

1. Blur: Stop all tracking (Idle).
2. Focus (Content): Slow polling (1Hz) to catch keyboard shortcuts (Win+Arrows) or non-mouse movements.
3. MouseOut (Top): Fast polling (rAF) because the user likely grabbed the title bar.
4. MouseEnter: Revert to Slow polling.

This replaces the simpler "Focus=Fast" logic originally proposed.