chore: update Google Sign-In client ID and remove redundant AnimatedSwitcher from app shell

lib/core/widgets/app_shell.dart

@@ -40,29 +40,7 @@ class _AppShellState extends State<AppShell> {
             child: const HomeHeader(),
           ),
           Expanded(
-            child: AnimatedSwitcher(
-              duration: const Duration(milliseconds: 150),
-              switchOutCurve: Curves.easeIn,
-              switchInCurve: Curves.easeOut,
-              layoutBuilder: (currentChild, previousChildren) {
-                return Stack(
-                  children: [
-                    ...previousChildren,
-                    if (currentChild != null) currentChild,
-                  ],
-                );
-              },
-              transitionBuilder: (child, animation) {
-                return FadeTransition(
-                  opacity: animation,
-                  child: child,
-                );
-              },
-              child: KeyedSubtree(
-                key: ValueKey(GoRouterState.of(context).uri.toString()),
-                child: widget.child,
-              ),
-            ),
+            child: widget.child,
           ),
         ],
       ),