feat: chatbot

frontend/src/hooks/useApi.ts

@@ -1426,3 +1426,33 @@ export function useScoreText() {
       api.post('/specialist-desks/score-text', body).then(r => r.data) as Promise<TextSentimentResult>,
   })
 }
+
+// ── AI Chat widget — free-form, read-only, context-aware conversation ────────
+
+export interface ChatMessage { role: 'user' | 'assistant'; content: string; created_at?: string }
+
+export const useChatContextBlocks = () =>
+  useQuery({
+    queryKey: ['ai-chat-blocks'],
+    queryFn: () => api.get('/ai-chat/blocks').then(r => r.data.blocks as string[]),
+    staleTime: Infinity,
+  })
+
+export const useChatHistory = (sessionId: string) =>
+  useQuery({
+    queryKey: ['ai-chat-history', sessionId],
+    queryFn: () => api.get('/ai-chat/history', { params: { session_id: sessionId } }).then(r => r.data.messages as ChatMessage[]),
+    enabled: !!sessionId,
+    staleTime: Infinity,
+  })
+
+export const useSendChatMessage = () =>
+  useMutation({
+    mutationFn: (body: { session_id: string; message: string; enabled_blocks?: string[]; refresh_context?: boolean }) =>
+      api.post('/ai-chat/', body).then(r => r.data as { reply: string; blocks_included: string[] }),
+  })
+
+export const useClearChatSession = () =>
+  useMutation({
+    mutationFn: (sessionId: string) => api.post('/ai-chat/clear', { session_id: sessionId }).then(r => r.data),
+  })