Move the pure protocol mappers model_track_to_core_queue_track,
normalize_volume_to_fraction, qconnect_repeat_mode_from_loop_mode (+ the
QCONNECT_REMOTE_QUEUE_SOURCE tag) into qconnect-app/src/renderer.rs so the
renderer orchestration that calls them (hoisted in a later step) can live there
too. The src-tauri mod.rs re-exports them, so corebridge + tests compile
unchanged. The load-dedup predicates and audio-quality report helpers move
alongside their orchestration / report consumers in the next steps (cohesion +
avoids churning the AUDIO_QUALITY_* consts now).
src-tauri qconnect 42 green.
cc
vicrodh
76a9169e2f