refactor(a11y): add basic lint for accessibility (#2021)

apps/readest-app/src/app/reader/components/sidebar/BookMenu.tsx

@@ -85,11 +85,8 @@ const BookMenu: React.FC<BookMenuProps> = ({ menuClassName, setIsDropdownOpen })
     setIsDropdownOpen?.(false);
   };
 
-  const isWebApp = isWebAppPlatform();
-
   return (
     <div
-      tabIndex={0}
       className={clsx('book-menu dropdown-content border-base-100 z-20 shadow-2xl', menuClassName)}
     >
       <MenuItem
@@ -149,7 +146,7 @@ const BookMenu: React.FC<BookMenuProps> = ({ menuClassName, setIsDropdownOpen })
       />
       <MenuItem label={_('Reload Page')} shortcut='Shift+R' onClick={handleReloadPage} />
       <hr className='border-base-200 my-1' />
-      {isWebApp && <MenuItem label={_('Download Readest')} onClick={downloadReadest} />}
+      {isWebAppPlatform() && <MenuItem label={_('Download Readest')} onClick={downloadReadest} />}
       <MenuItem label={_('About Readest')} onClick={showAboutReadest} />
     </div>
   );