Add gather windows to monitor mod (#4630)

## Summary

Adds a Windhawk tool mod that gathers eligible top-level application windows to a selected monitor work area with configurable global hotkeys.

## Details

- Supports targeting primary monitor, monitor 1/2/3, monitor under mouse, and monitor containing foreground window.
- Uses monitor work areas, cascaded placement, and center/top-left/mouse anchoring.
- Skips invisible, cloaked, shell, tool/no-activate, owned popup, minimized, fullscreen, and untitled windows by default.
- Runs as a Windhawk tool mod in `windhawk.exe` instead of injecting into Explorer.

## Validation

- Parsed metadata with repository `modSourceUtils`.
- Compiled with `scripts/compile_mod.py` using local Windhawk install for x86, x64, and arm64.
- Tested locally in Windhawk with four monitors; gather action moved eligible windows and skipped hidden/system windows.

Author: fjdiazt