refactor: conditionalize profile fields, update chat navigation transitions, and fix provider state management during widget lifecycle

lib/routing/app_router.dart

@@ -160,7 +160,9 @@ final routerProvider = Provider<GoRouter>((ref) {
               return CustomTransitionPage(
                 key: state.pageKey,
                 child: ChatScreen(conversationId: id),
-                transitionsBuilder: _fadeTransition,
+                transitionDuration: const Duration(milliseconds: 250),
+                reverseTransitionDuration: const Duration(milliseconds: 200),
+                transitionsBuilder: _slideTransition,
               );
             },
           ),
@@ -272,6 +274,22 @@ class _HomeRouteWrapper extends ConsumerWidget {
   }
 }
 
+/// Slide from right transition for push-style navigation.
+Widget _slideTransition(
+  BuildContext context,
+  Animation<double> animation,
+  Animation<double> secondaryAnimation,
+  Widget child,
+) {
+  return SlideTransition(
+    position: Tween<Offset>(
+      begin: const Offset(1, 0),
+      end: Offset.zero,
+    ).animate(CurvedAnimation(parent: animation, curve: Curves.easeOut)),
+    child: child,
+  );
+}
+
 /// Smooth fade transition for tab-to-tab navigation.
 Widget _fadeTransition(
   BuildContext context,