fix for resend, cooldown and a few small fixes

frontend/pweb/lib/utils/cooldown_format.dart

@@ -0,0 +1,8 @@
+String formatCooldownSeconds(int seconds) {
+  final minutes = seconds ~/ 60;
+  final remainingSeconds = seconds % 60;
+  if (minutes > 0) {
+    return '$minutes:${remainingSeconds.toString().padLeft(2, '0')}';
+  }
+  return remainingSeconds.toString();
+}