Freelook camera rotation fixes (RMB or right stick in dungeons):

- Fixed camera watchdog so forced movement can no longer permanently freeze combat, requiring a reload
- Made targetRotation continuously self-sync, so free-look release never snaps to a stale direction
- Confined the cursor during RMB drag, preventing screen-edge focus loss from causing camera swipes
- Raised stick engage/disengage thresholds above deadzone to stop spurious accidental look-around triggers
- Deduplicated four copies of look-state reset code into one shared helper to prevent future drift