- FIXED: Qt video black screen issue - WindowStaysOnTopHint interference eliminated
- FIXED: Database configuration persistence preventing always_on_top fix from taking effect
- FIXED: Threading architecture - Qt player now runs properly on main thread
- FIXED: Window behavior - main window goes behind other apps, overlay stays on top
- ADDED: Clean minimal interface - removed all toolbars, menus, status bars, context menus
- ADDED: Complete keyboard control - all functionality via shortcuts (F11, S, Space, M, Escape)
- UPDATED: Documentation with critical fixes and resolution details
- UPDATED: CHANGELOG.md with version 1.2.1 improvements
- UPDATED: README.md with latest critical fixes and interface changes

This resolves the core video display problem and achieves complete functional
parity between main.py and test_video_debug.py with professional interface.