- New ChatDiagnose.vue: multi-turn chat UI in the Diagnose tab
- Textarea input (auto-grows) for long free-form problem descriptions
- Source suggestion pre-flight: debounced POST /api/sources/suggest
identifies relevant log sources from the query text and shows them
as interactive chips (deselect to exclude before searching)
- Conversation history preserved across turns with LLM reasoning,
collapsible log entries, and "Save as incident" per turn
- Reuses existing /api/diagnose/stream — no new pipeline
- DiagnoseView.vue: Chat is now default tab; viewport-height layout
- POST /api/sources/suggest: token-overlap source ranking, no LLM
- Fix: add missing 'import re' causing 500 on suggest route
