- Hide translate button for already-translated songs in SongDB
- Auto-select newly created/cloned arrangement via onSuccess + nextTick
- Add preview button to SongDB list (fetches default arrangement preview)
- Show success toast with count after .pro file import
- Replace search+select with single searchable combo/autocomplete field
- Wire preview modal and PDF download to real endpoints in service songs
- Disable preview/PDF buttons when no arrangement selected
- Replace placeholder exception with real uploadProFiles() function
- POST files to /api/songs/import-pro endpoint
- Show success/error toast and refresh song list after import
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
