Small improvements
- Taskbar live preview now works — the taskbar clock and tray keep updating while the cascade is open
- Smoother handling of the Windows auto-hide taskbar (no per-frame fighting with the shell's hide animation)
- New Appearance option: Desktop in cascade — remove the desktop tile from the stack while keeping the wallpaper backdrop
- New Appearance option: Selected window label (off by default) — the selected window's title and app icon above the front tile, styled after the chosen Settings theme, with smooth position animation
- Refreshed demo media: 50 fps GIFs + new close-animation clip