fix(reports): add error handler and improve error messages for diagnosis

- Add reportsRouter.onError() to catch unhandled Drizzle/DB exceptions
  and return a JSON 500 with the error message instead of an empty response.
  Previously, any thrown error caused a non-OK response that the frontend
  showed only as a generic "Failed to load report data".
- Improve the frontend error to identify which specific report endpoint
  failed (name + HTTP status + first 120 chars of response body), making
  the root cause visible without needing to open the browser network tab.

Closes #49

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/routes/reports.ts

@@ -16,6 +16,11 @@ import {
 
 export const reportsRouter = new Hono();
 
+reportsRouter.onError((err, c) => {
+  console.error("[reports] unhandled error:", err);
+  return c.json({ error: "Internal server error", message: err.message }, 500);
+});
+
 // ─── Helpers ──────────────────────────────────────────────────────────────────
 
 function parseDate(value: string | undefined, fallback: Date): Date {