- Fix upsert_appimage returning 0 for existing records by falling
back to a SELECT query when last_insert_rowid is 0
- Replace --appimage-offset execution with binary squashfs magic scan
to avoid hanging on AppImages with custom AppRun scripts
- Add 5-second timeout fallback if binary scan fails
- Extract desktop files from usr/share/applications/ for reverse-DNS
named entries that root-level *.desktop glob misses
- Add root-level png/svg fallback in icon search
- Add CSS for drop overlay scrim, drop zone card, and drop zone icon
- Add card padding (24px 20px) so content does not touch card edges
- Always scan on startup to discover new AppImages
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