feat: add health check endpoint, fix task date filtering, and update Next.js type reference path

app/(dashboard)/analytics/analytics-client.tsx

@@ -43,7 +43,7 @@ export function AnalyticsClient({ data }: AnalyticsClientProps) {
   };
 
   const filteredFinances = data.finances.filter(f => filterByDate(f.transaction_date));
-  const filteredTasks = data.tasks.filter(t => filterByDate(t.created_at || t.due_at));
+  const filteredTasks = data.tasks.filter(t => filterByDate(t.created_at || t.due_at || null));
 
   // Project-based income
   const projectIncomeMap = new Map();

app/api/health/route.ts

@@ -0,0 +1,7 @@
+import { NextResponse } from "next/server";
+
+export const runtime = "edge";
+
+export function GET() {
+  return NextResponse.json({ status: "ok", timestamp: new Date().toISOString() });
+}