fix(core): block link recognition in self-hosted (#8340)

Part of [BS-1445](https://linear.app/affine-design/issue/BS-1445/点击-affine-link-时识别应用内链接，以触发应用内跳转)

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packages/frontend/core/src/components/hooks/affine/use-share-url.ts

@@ -27,7 +27,7 @@ export const generateUrl = ({
   pageId,
   blockIds,
   elementIds,
-  shareMode,
+  shareMode: mode,
   xywh, // not needed currently
 }: UseSharingUrl) => {
   // Base URL construction
@@ -36,13 +36,8 @@ export const generateUrl = ({
 
   try {
     const url = new URL(`/workspace/${workspaceId}/${pageId}`, baseUrl);
-    const search = toURLSearchParams({
-      mode: shareMode,
-      blockIds,
-      elementIds,
-      xywh,
-    });
-    if (search) url.search = search.toString();
+    const search = toURLSearchParams({ mode, blockIds, elementIds, xywh });
+    if (search?.size) url.search = search.toString();
     return url.toString();
   } catch {
     return null;