- Fixed brace mismatch and duplicate code in screenshot.rs
- Increased SHM pool size to 256MB for high-res displays
- Corrected wlr-screencopy protocol usage: send copy request in Buffer event
- Fixed background handling: set_background now updates LockedSurface.background
- Removed dummy background creation; screenshots set when ready
- Added format conversion for Xbgr8888 and Xrgb8888 to ARGB32
- Proper Y-inversion handling based on flags
The lock screen now displays captured screenshots as background.
Screenshots are taken immediately after lock, before UI is shown.
Matches swaylock-effects behavior: lock appears first, then screenshot
applies when ready (no blocking).
Fixes: black/red screen issues, screenshot not displaying.
jory