Mail: folder unread counts refresh at once after a change, read state survives a late list, no wrong message after quick clicks, mark unread keeps the message in the list

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

mail-imap.js

@@ -191,6 +191,8 @@ async function del(a, mid, permanent) {
   const [path, uid] = dec(mid);
   return withClient(a, async client => { const lock = await client.getMailboxLock(path); try { await client.messageDelete(String(uid), { uid: true }); } finally { lock.release(); } });
 }
+/** Counts shown in the folder list are kept 30 s; reading, moving, deleting or sending changes them, so the next request must ask again. */
+const dropFolders = id => { if (id) folderCache.delete(id); else folderCache.clear(); };
 async function unread(a) { return withClient(a, async client => (await client.status('INBOX', { unseen: true })).unseen || 0); }
 
 // ---- sending
@@ -251,4 +253,4 @@ async function connectNew({ type, address, password }) {
   return { type, address: addr, pass, name: '' };
 }
 
-module.exports = { PRESETS: Object.fromEntries(Object.entries(PRESETS).map(([k, v]) => [k, { name: v.name }])), folders, list, message, attachment, update, move, del, unread, send, reply, connectNew, forget };
+module.exports = { dropFolders, PRESETS: Object.fromEntries(Object.entries(PRESETS).map(([k, v]) => [k, { name: v.name }])), folders, list, message, attachment, update, move, del, unread, send, reply, connectNew, forget };