v0.2.2

Viewer: step through photos and videos in Library and Explore with on-screen controls or arrow keys (PR #7).
• Videos play inside the shared viewer; the opened item autoplays, browsed videos wait for play
• Explore gains the same Copy/Download/Share/Trash/Delete actions; deleted items leave Explore lists
• Viewer buttons match the sidebar style

Security rebuild against Ubuntu USN-8932-1 (libcurl3t64-gnutls).
• Rebuilt amd64 and arm64 snaps so staged Ubuntu packages pick up the curl security updates
• Republish to stable, candidate, beta, and edge so older vulnerable revisions leave those channels

Also in the v0.2.2 packages:
• PR #5: suggest original filenames when downloading and remember the last save folder
• PR #6: quit on window close when Close to tray is off, plus Ctrl+Q to quit
• Share links with optional password protection

Note: PR #7 landed after the v0.2.2 tag; it is on main and will ship in the next release build.