fix: 修复报错内容

app/static/app.js

@@ -15,6 +15,7 @@ const statusEl = $("status");
 const rewriteBtn = $("rewriteBtn");
 const wechatBtn = $("wechatBtn");
 const imBtn = $("imBtn");
+const coverUploadBtn = $("coverUploadBtn");
 
 function countText(v) {
   return (v || "").trim().length;
@@ -130,6 +131,7 @@ $("wechatBtn").addEventListener("click", async () => {
       title: $("title").value,
       summary: $("summary").value,
       body_markdown: $("body").value,
+      thumb_media_id: $("thumbMediaId") ? $("thumbMediaId").value.trim() : "",
     });
     if (!data.ok) throw new Error(data.detail);
     setStatus("公众号草稿发布成功");
@@ -140,6 +142,36 @@ $("wechatBtn").addEventListener("click", async () => {
   }
 });
 
+if (coverUploadBtn) {
+  coverUploadBtn.addEventListener("click", async () => {
+    const fileInput = $("coverFile");
+    const hint = $("coverHint");
+    const file = fileInput && fileInput.files && fileInput.files[0];
+    if (!file) {
+      setStatus("请先选择封面图片再上传", true);
+      return;
+    }
+    if (hint) hint.textContent = "正在上传封面...";
+    setLoading(coverUploadBtn, true, "上传封面并绑定", "上传中...");
+    try {
+      const fd = new FormData();
+      fd.append("file", file);
+      const res = await fetch("/api/wechat/cover/upload", { method: "POST", body: fd });
+      const data = await res.json();
+      if (!res.ok || !data.ok) throw new Error(data.detail || "封面上传失败");
+      const mid = data.data && data.data.thumb_media_id ? data.data.thumb_media_id : "";
+      if ($("thumbMediaId")) $("thumbMediaId").value = mid;
+      if (hint) hint.textContent = `封面上传成功，已绑定 media_id：${mid}`;
+      setStatus("封面上传成功，发布时将优先使用该封面。");
+    } catch (e) {
+      if (hint) hint.textContent = "封面上传失败，请看状态提示。";
+      setStatus(`封面上传失败: ${e.message}`, true);
+    } finally {
+      setLoading(coverUploadBtn, false, "上传封面并绑定", "上传中...");
+    }
+  });
+}
+
 $("imBtn").addEventListener("click", async () => {
   setStatus("正在发送到 IM...");
   setLoading(imBtn, true, "发送到 IM", "发送中...");