fix(spaces): bump duration cap, drop broken auto-retry, add friendly errors + like banner

fix(spaces): clamp _duration_for to 120s (ZeroGPU per-call hard max)

fix(spaces): propagate Gradio request contextvar to GPU worker thread

fix(spaces): _duration_for must accept progress kwarg to match _execute_workflow

feat(spaces+style): hf_oauth + gr.Progress + style 2-input + DWPose deps

feat(spaces): dynamic ZeroGPU duration + auto-retry on timeout

fix(spaces): bump @spaces.GPU duration 300s → 600s

fix(backend): compute video path inside @spaces.GPU + filesystem fallback

fix(spaces): module-level @spaces.GPU so ZeroGPU's startup detector finds it

fix(spaces): use \$HOME instead of /data (no persistent-storage add-on needed)

feat: API-format workflows + sidebar nav + responsive UI

fix(backend): pass cache_args to PromptExecutor + dump worker tracebacks

fix(backend,models): runtime corrections from end-to-end testing

ci: run unit tests + ruff lint on every push

feat(backend): submit() async generator with progress hooks + ZeroGPU

feat(backend): ComfyUILibraryBackend skeleton + event dataclasses