chore: pasting a link will not check whether it is an image

Author: asjqkkkk

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/copy_and_paste/custom_paste_command.dart

@@ -186,7 +186,7 @@ Future<bool> _pasteAsLinkPreview(
       node.delta?.toPlainText().isNotEmpty == true) {
     return false;
   }
-
+  if (!isMobile) return false;
   final bool isImageUrl;
   try {
     isImageUrl = await _isImageUrl(text);
@@ -195,7 +195,7 @@ Future<bool> _pasteAsLinkPreview(
     return false;
   }
 
-  if (!isMobile && !isImageUrl) return false;
+  if (!isImageUrl) return false;
 
   // insert the text with link format
   final textTransaction = editorState.transaction

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/link_preview/link_preview_cache.dart

@@ -40,7 +40,6 @@ export 'inline_math_equation/inline_math_equation.dart';
 export 'inline_math_equation/inline_math_equation_toolbar_item.dart';
 export 'keyboard_interceptor/keyboard_interceptor.dart';
 export 'link_preview/custom_link_preview.dart';
-export 'link_preview/link_preview_cache.dart';
 export 'link_preview/link_preview_menu.dart';
 export 'math_equation/math_equation_block_component.dart';
 export 'math_equation/mobile_math_equation_toolbar_item.dart';