- Rename error strings to use error_ prefix consistently
- Rename success strings to use success_ prefix
- Rename failure strings to use failed_ prefix
- Reorganize strings by feature groups with section comments
- Remove unused shortcuts.xml and manifest references
- Update all Kotlin code references
- Rename ComposeActivity to MainActivity
- Rename EditProfileComposeActivity to EditProfileActivity
- Rename NewProfileComposeActivity to NewProfileActivity
- Rename GroupsComposeActivity to GroupsActivity
- Move data models to compose/model package
- Update all references in AndroidManifest.xml and source files
Keep only Compose UI, removing old View-based Activities, Fragments,
and layouts. QRScanActivity and PerAppProxyActivity are retained as
they are still used by Compose UI.