fix: add safe generic fallback to date parsers to prevent parse errors

services/experiments.ts

@@ -232,7 +232,8 @@ export const calculateExperimentPerformance = async (
   experiment_acos: number;
   actual_lift_percent: number;
 }> => {
-  const parseLocalDate = (dateStr: string) => {
+  const parseLocalDate = (dateStr?: string) => {
+    if (!dateStr) return new Date();
     const [y, m, d] = dateStr.split('T')[0].split('-');
     return new Date(Number(y), Number(m) - 1, Number(d));
   };