Phase-2 Slice 4. The grid "+ New" buttons open a create modal (name + kind
radio: mixtape/collection, artist_collection excluded), create via the shared
crate, and drop the user into the new collection's detail (1:1 with Tauri's
submitCreateModal -> openMixtapeDetail). The new row prepends to its kind.
- ui/myqbz/CreateMyQbzModal.slint (mirrors CreatePlaylistModal/CreateFolderModal
idiom; spec 30 create-modal geometry).
- MyQbzCreateState/MyQbzCreateActions in state.slint; mounted in AppShell.
- src/myqbz.rs create_collection via with_db -> with_connection ->
qbz_mixtape::repo::create_collection (Manual, 80-char cap).
- Un-stubbed on_create_mixtape/on_create_collection; trim + busy guards; toast.
Backend crates untouched. cargo check -p qbz-slint green.
cc
vicrodh
be832324bd