fix and adjust main dashboard ai insight

types/api.ts

@@ -218,16 +218,12 @@ export type AIInsight = {
   topic: string;
   report_type: string;
   report_period: string;
-  source?: InsightSource;
   summary?: string;
   citations?: InsightCitation[];
   created_at: string;
   updated_at: string;
 };
 
-/** Source label shown in AI Insight UI — never hide local fallback as LLM. */
-export type InsightSource = 'generated' | 'cache' | 'local_fallback';
-
 export type InsightReportType = 'page' | 'daily' | 'weekly' | 'end_cycle';
 
 export type InsightTopic =
@@ -306,7 +302,6 @@ export type InsightStructuredReport = {
 /** Response from generate / cached insight endpoints. */
 export type InsightApiResponse = {
   success?: boolean;
-  source: InsightSource;
   insight_text: string;
   summary?: string;
   insight?: string;