Revert to pre-tutorial version (b0ebe11)

Deploy tutorial feature and recent fixes

Workshop: sample data menu, manage page, LLM UX, HANA 422 fix

Workshop UI, speech settings, experiment page, and HF Spaces deployment

Landing copy and layout updates; header brand; TTS controls; save-warning link

Header: user menu left; kebab (vertical dots) after name; dropdown align left

Fix Gemini chat (retries, JSON parse, config path), health gemini flag; always-visible user menu; Profile for guests; clearer chat errors

Initial CU Student AI Project Helper: FastAPI, Gemini, Mongo, React SPA