Add Justified galleries, albums, uploaded image search, and shared image
menus for desktop and touch with themed information dialogs.
Add administrator setup, account settings, optional passwordless guest
browsing, and OpenList storage. Refine settings, viewer interactions,
and branding.
Rename persistent application data to pixhelf-data and streamline the
README around Docker deployment, including legacy data migration.
Validated: frontend and Rust builds, 112 Rust tests (2 network tests
ignored), 198 layout cases, HTTP/HTTPS authentication and guest browser
checks, and Docker Compose configuration.
