Saved responses: store just the pair, not the full thread

Saved Responses: per-Q&A bookmarks with fork-on-click

Fix past-conversation delete (zombie bug) + title ellipsis

Fix persistence: bypass streamlit-js-eval's broken set_local_storage

Fix persistence: don't cache first-render None as 'loaded'

Add browser-local conversation persistence

Surface system prompt to prompts/generator_system.md

Prompt: lock 'Short answer:' as a level-2 heading

Initial commit — health marketing compliance RAG