feat(ui): add advanced controls accordion — inference steps, cfg, infer method, seed, lm cot, schedule, metadata

feat(ui): expand tooltips.py + apply info= to cover/extend/edit/lyrics tabs

feat(post): wire separate stems / normalise / mp3 export buttons in output panel (m5 g2)

feat(ui): wire lyrics tab + cross-tab use-in-generate handoff (m4)

feat(ui): wire cover/extend/edit tabs into the sidebar layout (m3 e3+e4)

fix(lora): point manifest at the actually-published ACE-Step LoRAs

feat(ui): wire single-lora picker into generate tab (m2 d5)

fix(ui): full Brutalist Mono retheme — IBM Plex, padding crush, scoped selectors

fix(ui): use gr.JSON for metadata output instead of gr.Code

feat(app): wire generate tab end-to-end to ace-step backend

feat(ui): add generate tab builder with prompt/lyrics/duration/vocal mode