fix(#375): resolve recharts TypeScript strict mode type errors

- Fix Tooltip formatter/labelFormatter type overload conflicts
- Fix Pie label render props type mismatch
- Fix telemetry.ts date split array access type

Refs #375

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/lib/api/telemetry.ts

@@ -70,7 +70,7 @@ function generateDateRange(range: TimeRange): string[] {
   for (let i = days - 1; i >= 0; i--) {
     const d = new Date(now);
     d.setDate(d.getDate() - i);
-    dates.push(d.toISOString().split("T")[0]);
+    dates.push(d.toISOString().split("T")[0] ?? "");
   }
 
   return dates;