Refactor: Streamline AppTimer and Verify OTP UI

- Removed unused `formKey` from `VerifyOTPScreen`.
- Simplified `AppTimer` widget by removing `onTick` and `textStyle` parameters.
- Updated `VerifyOTPState`'s `isValid` getter to include email validation.

Author: tulsi-7span

apps/app_core/lib/modules/verify_otp/bloc/verify_otp_state.dart

@@ -34,7 +34,7 @@ final class VerifyOTPState extends Equatable {
   final LengthValidator otp;
   final String errorMessage;
 
-  bool get isValid => otp.isValid;
+  bool get isValid => otp.isValid && email.isValid;
 
   @override
   List<Object> get props => [statusForResendOTP, email, otp, errorMessage, statusForVerifyOTP];

apps/app_core/lib/modules/verify_otp/screens/verify_otp_screen.dart

@@ -37,8 +37,6 @@ class VerifyOTPScreen extends StatefulWidget implements AutoRouteWrapper {
 }
 
 class _VerifyOTPScreenState extends State<VerifyOTPScreen> with TickerProviderStateMixin {
-  late final GlobalKey<FormState> formKey;
-
   Timer? _timer;
   int _secondsRemaining = 30;
   bool _isTimerRunning = true;
@@ -51,7 +49,6 @@ class _VerifyOTPScreenState extends State<VerifyOTPScreen> with TickerProviderSt
 
   @override
   void initState() {
-    formKey = GlobalKey<FormState>();
     _startTimer();
     super.initState();
   }
@@ -157,7 +154,7 @@ class _VerifyOTPScreenState extends State<VerifyOTPScreen> with TickerProviderSt
                           ),
                     ),
                     VSpace.xsmall8(),
-                    if (_isTimerRunning) AppTimer(seconds: 30, onTick: (remaining) {}, onFinished: () {}),
+                    if (_isTimerRunning) AppTimer(seconds: 30, onFinished: () {}),
                     VSpace.small12(),
                     Row(
                       mainAxisAlignment: MainAxisAlignment.center,

packages/app_ui/lib/src/widgets/molecules/app_timer.dart

@@ -4,17 +4,16 @@ import 'package:app_ui/app_ui.dart';
 import 'package:flutter/material.dart';
 
 class AppTimer extends StatefulWidget {
-  const AppTimer({required this.seconds, super.key, this.onTick, this.onFinished, this.textStyle});
+  const AppTimer({required this.seconds, super.key, this.onFinished});
   final int seconds;
-  final void Function(int secondsRemaining)? onTick;
+
   final VoidCallback? onFinished;
-  final TextStyle? textStyle;
 
   @override
   State<AppTimer> createState() => _AppTimerState();
 }
 
-class _AppTimerState extends State<AppTimer> with TickerProviderStateMixin {
+class _AppTimerState extends State<AppTimer> {
   late int _secondsRemaining;
   Timer? _timer;
 
@@ -42,7 +41,6 @@ class _AppTimerState extends State<AppTimer> with TickerProviderStateMixin {
         setState(() {
           _secondsRemaining--;
         });
-        if (widget.onTick != null) widget.onTick?.call(_secondsRemaining);
       } else {
         timer.cancel();
         if (widget.onFinished != null) widget.onFinished?.call();
@@ -59,9 +57,6 @@ class _AppTimerState extends State<AppTimer> with TickerProviderStateMixin {
   @override
   Widget build(BuildContext context) {
     final timerText = '00:${_secondsRemaining.toString().padLeft(2, '0')}';
-    return AppText(
-      text: timerText,
-      style: widget.textStyle ?? context.textTheme?.sSemiBold.copyWith(color: context.colorScheme.primary400),
-    );
+    return AppText(text: timerText, style: context.textTheme?.sSemiBold.copyWith(color: context.colorScheme.primary400));
   }
 }