New crate crates/qbz-mixtape holding the Mixtapes+Collections backend, ported
1:1 from src-tauri/src/mixtape and re-typed against the real shared crates so it
runs headless (no tauri::State, no #[tauri::command] wrappers) per ADR-005/006:
- schema.rs / repo.rs / shuffle.rs copied verbatim (SQLite schema + migrations,
CRUD repository, DJ-mix similarity sampler). enqueue.rs re-typed to
qbz_qobuz::QobuzClient, qbz_library::LibraryDatabase and qbz_plex, dropping the
src-tauri crate::api / crate::library shims.
- ItemResolver is frontend-agnostic: ProdItemResolver takes a caller-supplied
sync local-resolution closure so &LibraryDatabase (!Sync) never crosses an
.await. resolve_local_item centralizes the full Local dispatch matrix
(Album / Track i64-parse / Playlist-unsupported) so frontends cannot drift.
- src-tauri left untouched: Tauri is removed at the end of the Slint port, so the
temporary duplication is intentional and zero-risk to the working Tauri build.
Adds qbz-mixtape to the workspace members + rand/strsim workspace deps.
Phase-2 Slice 1 of the MyQBZ Slint port. 57 crate tests pass.
cc