Fix date parsing bug and Vite proxy port configuration

- Add safeParseDate helper to handle dates that may be strings, Date objects, or timestamps
- Replace all parseISO(event.*) calls with safeParseDate() to prevent "dateString.split is not a function" errors
- Fix Vite proxy target from port 3002 to 3001 to match backend server port

frontend/vite.config.ts

@@ -29,11 +29,11 @@ const config: VitestUserConfig = {
     host: true,
     proxy: {
       '/api': {
-        target: 'http://localhost:3002',
+        target: 'http://localhost:3001',
         changeOrigin: true,
       },
       '/photos': {
-        target: 'http://localhost:3002',
+        target: 'http://localhost:3001',
         changeOrigin: true,
       },
     },