Lemenzo Gallery v1.1 production polish

Fixed and hardened:
- Permission handling is now per media type (images/videos) and supports Android 14+ selected-photo access.
- A dedicated permission state is shown instead of an empty/blank gallery.
- MediaStore queries only media types the user has granted access to and log query failures instead of crashing.
- Main tab indicator now uses the actual padded tab container width.
- Selected tab is preserved across Activity recreation.
- Photos grid has real multi-select with a premium bottom action bar for Share, Favorite and Trash.
- Selection visuals now include a clear check indicator.
- Image viewer zoom is relative to fit-to-screen, eliminating the previous jump/helium-like scale behavior.
- Viewer swipe gestures no longer compete with panning while zoomed.
- Image decoding uses ImageDecoder so EXIF orientation is respected and large media is downsampled to the display target.
- Thumbnail and image loader executors are explicitly shut down with their owners.
- Fragment/activity background executors are lifecycle-cleaned.
- Media query, viewer, trash and EXIF errors are logged instead of silently swallowed.
- Search now matches filename, album, media type and localized date/month terms.
- Gallery helper classes are no longer empty placeholders.
- Photo grid spacing is normalized to an actual ~2dp visual gap.

Preserved:
- Lemenzo header: 40dp top padding, 20dp horizontal padding, 58dp Gallery logo, 28sp title.
- SecureLineUI/Lemenzo ecosystem theme and components.
- Local-only design: no account, cloud, analytics, advertising or network permission.
- Photos, Videos, Albums, Favorites, Search, Viewer, Share, Details/EXIF, Trash, Restore and permanent delete.

Editor note:
The editor Activity remains internal/not exposed from the Gallery UI. Advanced crop/adjustment tooling is intentionally not presented as a completed v1 feature.


Production polish v1.2:
- Multi-select Favorite/Trash now clears only after RESULT_OK. Cancel keeps selection.
- Search is debounced (180ms) and filtered off the UI thread with stale-result suppression.
- Placeholder EditorActivity is no longer registered in the production manifest.
- Dark Lemenzo theme, blue accents, 40dp top padding, 20dp side padding, 58dp logo and 28sp title remain unchanged.