Lumen 0.3.3

Fixes

• Deleting photos now works on NAS volumes. SMB shares have no Trash, so deletion silently did nothing; Lumen now warns Finder-style ("deleted immediately") and deletes in place — NAS-side recycle bins still catch it. Failures surface a toast instead of vanishing.
• Backspace/Delete actually delete in the viewer, list, and month views (the key never matched on SwiftUI views).
• Switching folders starts at the top instead of keeping the previous scroll position; deleting/importing in place still keeps your spot.
• Sidebar folders with subfolders: single click selects with the proper accent highlight and reveals children every time; re-click toggles them closed.
• Corrupt image files (zero-filled failed copies) show a warning mark instead of masquerading as a generic JPEG icon — and no longer poison the thumbnail cache.

New

• Closing the window no longer quits: thumbnail cache warming continues at a trickle (under 1% CPU, one decode every few seconds) and returns to full speed when you reopen the window. ⌘Q quits as usual.