feat(api.ts): add BriefingData type with full briefing response fields

src/lib/api.ts

@@ -298,3 +298,21 @@ export interface FinancialSignal {
   expiresAt: string | null;
   createdAt: string;
 }
+
+export interface BriefingData {
+  generatedAt: string;
+  score: number;
+  overdueTasks: Task[];
+  upcomingTasks: Task[];
+  todayTasks: Task[];
+  atRiskGoals: Goal[];
+  pendingDecisions: Decision[];
+  criticalSignals: FinancialSignal[];
+  expiringOpportunities: Array<{ id: string; source: string; nextAction?: string | null }>;
+  weekInReview: {
+    newOrganizations: number;
+    newSegments: number;
+    newResearchBriefs: number;
+  };
+  aiExplanation: string | null;
+}