Replace all SongGroup/SongArrangementGroup model usages with Label/SongArrangementLabel
after the schema migration to global labels. Updates 12 app files and 11 test files:
- SongService: createDefaultGroups now finds-or-creates global Labels by name
- ArrangementController: validates label_id (labels are global, no song-ownership)
- ProImportService: imports groups as Labels (firstOrCreate by name); does not
overwrite existing label colors per spec
- ProExportService/SongPdfController/TranslationService/etc: traverse via
arrangements -> arrangementLabels -> label -> songSlides chain
- All test factories and assertions adapted to label-based schema
T20: Song DB Page
- Songs/Index.vue with search, action buttons, pagination
- Upload area for .pro files (calls T23 placeholder)
- Song-Datenbank nav link added to AuthenticatedLayout
- Tests: 9 new (44 assertions)
T21: Song DB Edit Popup
- SongEditModal.vue with metadata + ArrangementConfigurator
- Auto-save with fetch (500ms debounce for text, immediate on blur)
- Tests: 11 new (53 assertions)
T22: Song DB Translate Page
- Songs/Translate.vue with two-column editor
- URL fetch or manual paste, line-count constraints
- Group headers with colors, save marks has_translation=true
- Tests: 1 new (12 assertions)
T23: .pro File Placeholders
- ProParserNotImplementedException with HTTP 501
- ProFileController with importPro/downloadPro placeholders
- German error messages
- Tests: 5 new (7 assertions)
T24: Service Finalization + Status
- Two-step finalization with warnings (unmatched songs, missing slides)
- Download placeholder toast
- isReadyToFinalize accessor on Service model
- Tests: 11 new (30 assertions)
All tests passing: 174/174 (905 assertions)
Build: ✓ Vite production build successful
German UI: All user-facing text in German with 'Du' form
