Change app ID to com.outlay.app, add AppStream metadata, fix toast visibility

- Change app ID from io.github.outlay to com.outlay.app across all files
- Add AppStream metainfo with full feature description, 16 screenshots, and v0.1.0 release
- Update desktop file with expanded metadata (StartupNotify, SingleMainWindow)
- Add summary and description fields to GSchema keys
- Move toast overlay outside ScrolledWindow so notifications stay visible in viewport
- Embed tray icon as ARGB pixmap data for reliable system tray display
- Register hicolor icon theme path for taskbar icon on Wayland
- Remove unused icon variants (old naming, web favicons, SVG, ICO, shadow)
- Add screenshots to data/screenshots/
- Update build script with metainfo and screenshot bundling

outlay-gtk/src/log_view.rs

@@ -1634,8 +1634,7 @@ impl LogView {
         inner.append(&recent_group);
 
         clamp.set_child(Some(&inner));
-        toast_overlay.set_child(Some(&clamp));
-        container.append(&toast_overlay);
+        container.append(&clamp);
 
         LogView {
             container,