stable POC version 1 - chat and topics

frontend/src/stores/chatStore.ts

@@ -6,7 +6,7 @@ export interface ChatMessage {
   id: string
   role: 'USER' | 'ASSISTANT'
   content: string
-  sources: Array<{ bookTitle: string; page: number | null }>
+  sources: Array<{ bookTitle: string; page: number | null; chunkText?: string }>
   createdAt: string
 }
 
@@ -91,6 +91,21 @@ export const useChatStore = defineStore('chat', () => {
     }
   }
 
+  function leaveSession(): void {
+    session.value = null
+    messages.value = []
+    error.value = null
+  }
+
+  async function fetchSessionsByTopic(topicId: string): Promise<ChatSession[]> {
+    try {
+      const response = await api.get<ChatSession[]>('/chat/sessions', { params: { topicId } })
+      return response.data
+    } catch {
+      return []
+    }
+  }
+
   async function deleteSession(): Promise<boolean> {
     if (!session.value) return false
     loading.value = true
@@ -117,6 +132,8 @@ export const useChatStore = defineStore('chat', () => {
     createSession,
     loadMessages,
     sendMessage,
+    leaveSession,
+    fetchSessionsByTopic,
     deleteSession
   }
 })