v0.3.0 - Opacity, center-keep-size, pull-to-cursor

Added

• Ctrl+Win+O — Cycle window opacity: 100% → 80% → 60% → 100%. Useful for keeping an auxiliary window visible without occluding the main work area (video PIP, reference docs over a game, etc.).
• Ctrl+Win+G — Center the active window on its current monitor without resizing. Distinct from Ctrl+Win+C (Smart Center), which resizes to a 1/3 strip.
• Ctrl+Win+P — Pull the active window to the monitor under the mouse cursor. Snap state is preserved (e.g. a "right half" window stays "right half" on the target monitor). Useful when you want a window where your attention already is, without thinking about direction keys.

Fixed

• MouseGetPos is now explicitly set to screen coordinates (CoordMode("Mouse", "Screen")). AHK v2's default is client-relative, which made Ctrl+Win+P fail when the cursor was on a different monitor than the active window.

Internal

• OpacityState map joins UndoMap and SnapState in the 60-second periodic cleanup.
• SnapState now supports a "Gravity" kind so that Ctrl+Win+G's "centered, size-preserved" intent survives a subsequent Ctrl+Win+Shift+Arrow monitor jump.