Add smart ACK provider for WeChat MP replies

Replace fixed ackText with a rule-based AckProvider that picks
response templates by message type and intent (translate, summary,
rewrite, poster, ppt, mindmap, code, search, schedule). Pure sync,
zero I/O, auto-falls back to config.ackText on any error.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/utils/shareChannels.ts

@@ -95,9 +95,17 @@ export async function nativeShare(payload: SharePayload) {
 }
 
 export function buildAssetSharePayload(
-  asset: { displayName: string },
+  asset: { displayName: string; publicUrl?: string | null },
   categoryCode?: string,
 ): SharePayload {
+  if (asset.publicUrl) {
+    const publicUrl = new URL(asset.publicUrl, window.location.origin).toString();
+    return {
+      title: asset.displayName,
+      url: publicUrl,
+      description: `看看我在 TKMind 空间里的图片「${asset.displayName}」`,
+    };
+  }
   const url = new URL(resolveMindSpaceHomeUrl());
   if (categoryCode) {
     url.searchParams.set('category', categoryCode);