try to address context issues after inactivity

app/lib/features/geckoview/features/browser/presentation/widgets/sheets/view_tab.dart

@@ -86,6 +86,8 @@ class ViewTabSheetWidget extends HookConsumerWidget {
     final scrolledTo = useRef(0.0);
     useEffect(() {
       WidgetsBinding.instance.addPostFrameCallback((_) async {
+        if (!context.mounted) return;
+
         final header = headerKey.currentContext?.findRenderObject();
         final text = textFieldKey.currentContext?.findRenderObject();
 
@@ -96,6 +98,7 @@ class ViewTabSheetWidget extends HookConsumerWidget {
 
             final relative = totalHeight / MediaQuery.of(context).size.height;
 
+            if (relative >= 0 && relative <= 1) {
               if (draggableScrollableController.size < relative &&
                   relative > scrolledTo.value) {
                 await draggableScrollableController.animateTo(
@@ -107,13 +110,15 @@ class ViewTabSheetWidget extends HookConsumerWidget {
               }
             }
           }
+        }
       });
 
       return null;
     });
 
     final bottomInsets = useRef(0.0);
-    useEffect(() {
+    useEffect(
+      () {
         WidgetsBinding.instance.addPostFrameCallback((_) {
           final diff =
               ((MediaQuery.of(context).viewInsets.bottom / 2) /
@@ -128,7 +133,12 @@ class ViewTabSheetWidget extends HookConsumerWidget {
         });
 
         return null;
-    }, [MediaQuery.of(context).viewInsets.bottom]);
+      },
+      [
+        MediaQuery.of(context).viewInsets.bottom,
+        MediaQuery.of(context).size.height,
+      ],
+    );
 
     return NestedScrollView(
       physics: const NeverScrollableScrollPhysics(),