Step 6 of the renderer-engine extraction. Moves the renderer orchestration
out of the Tauri adapter UP into frontend-agnostic qconnect-app, rewritten
against &impl QconnectRendererEngine instead of &CoreBridge, so the Slint
adapter reuses the hard-won echo/cursor/materialize/shuffle logic instead of
re-deriving it.
Moved into qconnect_app::renderer (byte-for-byte, bridge -> engine):
apply_renderer_command (incl. the #387 echo-seek gate, the stale-projected-
track guard, force-restart-removed reasoning), materialize_remote_queue (skip-
gate, dedupe+batch hydrate, 3-tier start-index, shuffle deferral
effective_shuffle_enabled = shuffle_mode && order.is_some(), cursor-align +
stale-local-stop), sync_remote_shuffle_projection, align_queue_cursor,
apply_remote_loop_mode, ensure_remote_track_loaded (+ should_reload /
is_recent / queue_state_needs_materialization, LOAD_ATTEMPT_DEDUP_WINDOW,
PLAYING_STATE_* consts). The sync_state lock-drop-across-await discipline is
preserved; last_load_attempt is still recorded before the load.
Stays adapter-side: corebridge.rs is now thin wrappers that unwrap the
Arc<RwLock<Option<CoreBridge>>> guard and delegate (event_sink/service call
sites unchanged). In operation the bridge is populated at startup before any
QConnect session opens, so the guard-before-skip reorder is unreachable;
behavior is byte-identical. ensure_remote_track_loaded now resolves duration
via get_track then calls engine.start_track_stream (which owns get_stream_url +
the protected feeder); the two independent catalog reads swap order, benign.
mod.rs re-exports PLAYING_STATE_* from qconnect-app.
Verified: cargo check -p qbz-nix clean (no warnings); qbz-nix qconnect 42/42 +
qconnect-app 38/38 green; Opus adversarial review CLEAN across byte-identity,
guard-reorder, lock-discipline, ensure-reorder, Send/generics, re-exports.
cc
vicrodh
b21d45c2f6