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Fix: add type hints for all API endpoint parameters (gr.OAuthProfile | None)

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

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

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Update app.py

Remove credentials field for 100% secure server-side key loading

Align Gradio client predictor parameters and connection imports with official docs

Initialize Step 3.7 Flash Gradio Server application