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

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

ci: run unit tests + ruff lint on every push

fix(workflow): support dict-keyed widgets_values for VHS audio/video nodes

feat(modes): A2V + Lipsync + Keyframe + Style parameterize_fn

feat(modes): T2V + I2V parameterize_fn with stage maps

feat(modes): Mode dataclass + empty MODE_REGISTRY skeleton