Complete UI rebuild: switch to gradio.Server static-file serving, fix mobile layout from reference UI

Complete UI rebuild: remove broken Gradio overrides, match reference layout

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Fix UI: remove LoginButton, fix aggressive CSS overrides that hid custom HTML component

Fix UI: aggressive Gradio overrides, custom-app-root wrapper, OAuth LoginButton fix

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feat: add HF OAuth auth, per-user sessions, chat history sidebar

feat: add RP markdown support + auto-hide thinking

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Upload folder using huggingface_hub

Embed brand logo image, fix blocking client connection and style header buttons

Rename app to Step-3.7-Flash and style header action buttons

Declutter interface for ultra-minimalist and mobile-friendly StepFun Studio design

Redesign playground to match StepFun Studio reference UI

Initialize Step 3.7 Flash Gradio Server application