chat: bottom input matches hero — floating card, text-xl, Send label

chat: cycle loading messages through pipeline phases

sidebar: show full question text for conversations and saved responses

chat: constrain thread to max-w-3xl centred column

chat-ui: profession-specific starter pills

chat-ui: stop button replaces send while streaming

chat-ui: profession select default option → '-- please select --'

chat-ui: move new conversation button above saved responses in bottom block

chat-ui: group saved responses + past conversations at sidebar bottom

chat-ui: move download saved responses below saved responses section

chat-ui: pin past conversations to bottom of sidebar

chat-ui: reduce starter pills to four

chat-ui: hero input — larger textarea (4 rows, text-xl) matching Claude.ai scale

chat-ui: centred hero layout with input as focal point, input moves to bottom on chat

Refactor: replace Streamlit with React+Vite SPA + FastAPI server