feat: report indexing progress with page counts in status panel

frontend/src/api.ts

@@ -19,6 +19,9 @@ export interface Status {
   model: string;
   last_indexed_at: string | null;
   errors: string[];
+  pages_processed: number;
+  pages_total: number;
+  current_file: string | null;
 }
 
 export interface ChatMessage {