Add streaming, activities tool, flight route columns, and UX improvements

Updating user profile

Add persistent user travel profile with Settings UI integration

Add multi-model support, tiered routing, flight dedup, and UX improvements

Level-1 context pruning: stub format_itinerary tool result after final answer

Fix rate limit errors from search_hotel_details web search

Reduce fixed prompt overhead by 46% (2,465 → 1,336 tokens)

Fix parse_travel_request JSON parsing robustness

Add search_hotel_details tool with Anthropic web search

Upgrade LiteLLM to fix Pydantic serializer warning

Replace PDF export with styled HTML download

Fix date mismatch between flight and hotel search

Add PDF export feature

Fix cl.Action API: use payload= instead of value= (Chainlit 2.5.5)

Add 'New Conversation' button to clear history between requests