fix(core): some dnd perf issues (#9661)

1. page list item are bound two draggables. adding `draggable` prop to WorkbenchLink to mitigate the issue.
2. DndService may not resolve datatransfer when dragging.

packages/frontend/core/src/modules/dnd/services/index.ts

@@ -81,7 +81,7 @@ export class DndService extends Service {
     isDropEvent?: boolean
   ) => {
     if (!isDropEvent) {
-      return this.resolveBlocksuiteExternalData(args.source) || {};
+      return {};
     }
 
     let resolved: AffineDNDData['draggable'] | null = null;
@@ -168,30 +168,24 @@ export class DndService extends Service {
     if (!dndAPI) {
       return null;
     }
-
-    if (source.types.includes(dndAPI.mimeType)) {
-      const from = {
-        at: 'blocksuite-editor',
-      } as const;
-
-      let entity: Entity | null = null;
-
-      const encoded = source.getStringData(dndAPI.mimeType);
-      const snapshot = encoded ? dndAPI.decodeSnapshot(encoded) : null;
-      entity = snapshot ? this.resolveBlockSnapshot(snapshot) : null;
-
-      if (!entity) {
-        return {
-          from,
-        };
-      } else {
-        return {
-          entity,
-          from,
-        };
-      }
+    const encoded = source.getStringData(dndAPI.mimeType);
+    if (!encoded) {
+      return null;
     }
-    return null;
+    const snapshot = dndAPI.decodeSnapshot(encoded);
+    if (!snapshot) {
+      return null;
+    }
+    const entity = this.resolveBlockSnapshot(snapshot);
+    if (!entity) {
+      return null;
+    }
+    return {
+      entity,
+      from: {
+        at: 'blocksuite-editor',
+      },
+    };
   };
 
   private readonly resolveHTML: EntityResolver = html => {