fixing incosistency in animation preview initstate func and prep animation logic

Author: DecodeX15

assets/animations/Ex15.json

@@ -310,10 +310,10 @@
       "benefits": "Strengthens and tones abdominal muscles; improves core stability and posture; trims waistline; enhances balance and stability",
       "contraindications": "lower_back_injury;neck_injury;osteoporosis;post_abdominal_surgery",
       "instructions": "Lie on your back, knees bent, feet flat on the floor, hands on chest or behind head.\nContract your abs and lift your shoulders off the floor, curling toward your knees.\nHold briefly at the top, then slowly lower back down and repeat.",
-      "is_lottie": true,
+      "is_lottie": false,
       "third_party": false,
       "equipments": "",
-      "animation_link": "https://lottiefiles.com/free-animation/abs-crunches-kqvZGz4NGQ"
+      "animation_link": "https://res.cloudinary.com/dyvolu8tc/video/upload/v1784020936/Abdominal_crunches_najeqv.mp4"
     },
     {
       "exercise_id": "Ex16",

assets/exercises/exercises.json

@@ -1,5 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import 'package:move_your_body/core/routing/app_routes.dart';
+import 'package:move_your_body/core/model/exercise_data.dart';
 import 'package:move_your_body/core/theme/app_colors.dart';
 import 'package:move_your_body/core/widgets/app_scaffold.dart';
 import 'package:move_your_body/features/home/models/session_execution_state.dart';
@@ -18,6 +21,12 @@ class SessionExecutionScreen extends ConsumerWidget {
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
+    ref.listen(sessionExecutionViewModelProvider(sessionId), (previous, next) {
+      if (next.currentPhase == ExecutionPhase.finished) {
+        context.go(AppRoutes.home);
+      }
+    });
+
     final state = ref.watch(sessionExecutionViewModelProvider(sessionId));
     final bottomInset = MediaQuery.of(context).padding.bottom;
 
@@ -84,6 +93,15 @@ class SessionExecutionScreen extends ConsumerWidget {
       nextExerciseName = state.exercises[state.currentExerciseIndex + 1].name;
     }
 
+    Exercise? nextAnimExercise;
+    if (state.currentPhase == ExecutionPhase.preparation) {
+      nextAnimExercise = currentExercise;
+    } else if (state.currentPhase == ExecutionPhase.rest) {
+      if (state.currentExerciseIndex + 1 < state.exercises.length) {
+        nextAnimExercise = state.exercises[state.currentExerciseIndex + 1];
+      }
+    }
+
     return AppScaffold(
       child: SafeArea(
         child: Padding(
@@ -109,9 +127,7 @@ class SessionExecutionScreen extends ConsumerWidget {
                 child: ExecutionAnimationBox(
                   exercise: currentExercise,
                   isResting: isResting || state.currentPhase == ExecutionPhase.preparation,
-                  nextExercise: state.currentExerciseIndex + 1 < state.exercises.length
-                      ? state.exercises[state.currentExerciseIndex + 1]
-                      : null,
+                  nextExercise: nextAnimExercise,
                 ),
               ),
 

lib/features/home/screens/session_execution_screen.dart

@@ -30,6 +30,23 @@ class _AnimationPreviewState extends ConsumerState<AnimationPreview> {
     }
   }
 
+  @override
+  void didUpdateWidget(AnimationPreview oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    if (oldWidget.exercise.exerciseId != widget.exercise.exerciseId) {
+      final oldController = _videoController;
+      _videoController = null;
+      _animationFile = null;
+      _hasError = false;
+      
+      oldController?.dispose();
+
+      if (!widget.exercise.isLottie && widget.exercise.animationLink.isNotEmpty) {
+        _loadAnimation();
+      }
+    }
+  }
+
   Future<void> _loadAnimation() async {
     try {
       final file = await ref.read(