Lemenzo Gallery v1.16 — Premium About

Added a small internal About Lemenzo Gallery screen matching the premium Lemenzo Camera visual language.

About content:
- Lemenzo Gallery logo
- Description
- Privacy & Security: no telemetry, no analytics, no cloud processing, no account required, local processing only
- Key Features: library/albums, RAW/DNG + Ultra HDR + Motion Photos, photo/video editing, metadata-free private sharing, smart on-device categories, Lemenzo Vault integration
- LemenzoOS Ecosystem description
- Version 1.0 only at the bottom
- Private. Secure. Protected.

Main-screen integration:
- Search remains directly accessible.
- The previous Trash header action is now a More menu containing Trash and About Lemenzo Gallery, avoiding header crowding on smaller Pixel screens.
- Viewer Info remains media-details only and is unchanged.

Security/privacy:
- AboutActivity is internal (exported=false).
- No new permissions, network access, telemetry, analytics, cloud processing or account dependency.