enhance illustration being taken into account in the response

frontend/src/stores/topicStore.ts

@@ -10,9 +10,15 @@ export interface Topic {
 }
 
 export interface SourceReference {
+  type?: 'TEXT' | 'FIGURE'
+  refLabel?: string
   bookId: string | null
   bookTitle: string
   page: number | null
+  figureId?: string
+  label?: string
+  caption?: string
+  imageUrl?: string
 }
 
 export interface TopicSummary {