Add stop controls for analysis and QA queue

Refine chatbot queue UX and source resets

Add queued chatbot question handling

Fix analysis header controls

Remove Nemotron integration

Revert app defaults to Qwen

Add resilient document QA flow

Improve responsive analysis tables

Rebuild precomputed retrieval without vector indexes

Refine summary rerun and source button UI

Use full-document Q&A and refine ask row

Switch default Qwen model and collapse Q&A snippets

test: cover ingestion and rag pipeline