feat(songs): per-song sections + section editing; fix CCLI import bugs
Refactor lyric storage so each song owns its sections instead of sharing
global labels. Adds song_sections (per song+label) owning song_slides;
labels stay global ProPresenter group tags (name/color/macro). Arrangements
now reference sections, so editing/importing one song no longer corrupts
others that share a label name.
- New: song_sections table + migration with safe backfill; SongSection,
SongArrangementSection models; SongSectionController (edit/add/delete
sections, immediate persistence) wired into SongEditModal.
- Refactor writers/readers: CcliImport, ProImport, SongService,
ArrangementController, SongController, ProExport, PDF, Translation
(translation reset now section-scoped), CCLI pairing.
- CCLI import fixes: parse SongSelect copy-icon format (German "Vers"
abbrev + trailing author), fill empty CTS-synced songs instead of
blocking as duplicate, distinct label colors per section kind,
import&edit/existing-song open the edit modal (no 404/405), teleport
paste dialog above assign dialog, preview shows section content,
correct SongSelect search URL, copy-icon instructions.
- Bookmarklet clicks #generalCopyLyricsButton and captures clipboard;
serves correct host from request.
- Export: embed key-visual/background under fixed bundle-relative names.
- Tests updated for the section model; new section + isolation coverage.
ae42b48753