fix: get rid of invalid grid insets (#1943)

apps/readest-app/src/app/reader/components/HeaderBar.tsx

@@ -148,7 +148,7 @@ const HeaderBar: React.FC<HeaderBarProps> = ({
               !windowButtonVisible && 'max-w-[50%]',
             )}
           >
-            {bookTitle} {bookTitle} {bookTitle} {bookTitle}
+            {bookTitle}
           </h2>
         </div>
 

apps/readest-app/src/store/readerStore.ts

@@ -327,7 +327,8 @@ export const useReaderStore = create<ReaderStore>((set, get) => ({
       },
     })),
 
-  getGridInsets: (key: string) => get().viewStates[key]?.gridInsets || null,
+  getGridInsets: (key: string) =>
+    get().viewStates[key]?.gridInsets || { top: 0, right: 0, bottom: 0, left: 0 },
   setGridInsets: (key: string, insets: Insets | null) =>
     set((state) => ({
       viewStates: {