fix: populate header image in profile lookups and timeline enrichment

- accounts/lookup: add bannerUrl to ap_following path (was missing, follower path was correct)
- account-cache: store headerUrl alongside counts and avatarUrl
- resolve-account: pass headerUrl to cacheAccountStats
- enrich-accounts: apply cached.headerUrl to account.header/header_static

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

lib/mastodon/helpers/account-cache.js

@@ -21,7 +21,7 @@ const idToUrl = new Map();
 /**
  * Store account stats in cache.
  * @param {string} actorUrl - The actor's URL (cache key)
- * @param {object} stats - { followersCount, followingCount, statusesCount, createdAt, avatarUrl }
+ * @param {object} stats - { followersCount, followingCount, statusesCount, createdAt, avatarUrl, headerUrl }
  */
 export function cacheAccountStats(actorUrl, stats) {
   if (!actorUrl) return;

lib/mastodon/helpers/enrich-accounts.js

@@ -60,6 +60,10 @@ function applyCachedOrCollect(account, uncachedUrls) {
       account.avatar = cached.avatarUrl;
       account.avatar_static = cached.avatarUrl;
     }
+    if (cached.headerUrl) {
+      account.header = cached.headerUrl;
+      account.header_static = cached.headerUrl;
+    }
     return;
   }
 

lib/mastodon/helpers/resolve-account.js

@@ -133,13 +133,14 @@ export async function resolveRemoteAccount(acct, pluginOptions, baseUrl, collect
     account.following_count = followingCount;
     account.statuses_count = statusesCount;
 
-    // Cache stats (+ avatar URL) so embedded account objects in statuses can use them
+    // Cache stats (+ avatar + header) so embedded account objects in statuses can use them
     cacheAccountStats(actorUrl, {
       followersCount,
       followingCount,
       statusesCount,
       createdAt: published || undefined,
       avatarUrl: avatarUrl || undefined,
+      headerUrl: headerUrl || undefined,
     });
 
     // Persist actor URL mapping to MongoDB so follow/unfollow survives server restarts

lib/mastodon/routes/accounts.js

@@ -126,7 +126,7 @@ router.get("/api/v1/accounts/lookup", async (req, res, next) => {
     if (following) {
       return res.json(
         serializeAccount(
-          { name: following.name, url: following.actorUrl, photo: following.avatar, handle: following.handle, createdAt: following.createdAt || undefined },
+          { name: following.name, url: following.actorUrl, photo: following.avatar, handle: following.handle, bannerUrl: following.banner || "", createdAt: following.createdAt || undefined },
           { baseUrl },
         ),
       );