queue_resolution.rs is pure protocol math (queue_item_id/track_id/order cursor
reconciliation) over QConnectQueueState/QConnectRendererState only -- no engine,
no Tauri. Relocate it to qconnect-app so the renderer orchestration that calls it
(materialize / cursor-align, hoisted in a later step) can live there too. The
src-tauri module becomes a `pub(super) use qconnect_app::queue_resolution::*;`
re-export shim, so every `super::queue_resolution::…` call site + the existing
tests compile unchanged. Visibility widened pub(super)->pub for the re-export.
src-tauri qconnect 42 green (tests now exercise the moved code via the shim),
qconnect-app check green.
cc
vicrodh
1133b8b45d