Mail opens faster: the page draws at once from a no-network status, the list, folders and unread counts load side by side, unread counts are cached and time-limited per account, IMAP keeps connections warmer and limits folder counting, messages are prefetched on hover

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

tools/mail-imap-test.js

@@ -55,6 +55,9 @@ const free = () => 21000 + Math.floor(Math.random() * 20000);
   ok('and is stored encrypted', !fs.readFileSync(path.join(dir, 'users', 'unate', 'mail-accounts.json'), 'utf8').includes(PASS));
   r = await A('/api/mail/status'); ok('status lists the account with its unread count (2 unread in the inbox)', r.json.connected && r.json.accounts.length === 1 && r.json.accounts[0].unread === 2 && r.json.unread === 2, r.json);
 
+  r = await A('/api/mail/status?light=1'); ok('the light status lists the accounts without asking the mail servers (what lets the Mail tab draw at once)', r.json.connected && r.json.accounts.length === 1 && !r.json.accounts[0].error, r.json);
+  const t0 = Date.now(); r = await A('/api/mail/status'); const t1 = Date.now(); r = await A('/api/mail/status'); ok('the full status is answered from a short-lived cache the second time (counts are refreshed at most every 30 s)', Date.now() - t1 <= Math.max(50, t1 - t0), [t1 - t0, Date.now() - t1]);
+
   // ================= reading =================
   r = await A('/api/mail/folders?acct=' + gm.id); const names = r.json.map(f => f.name);
   ok('folders: Inbox, Sent, Archive (Gmail "All Mail"), Junk, Deleted, then your own; the [Gmail] container is hidden', names.join() === 'Inbox,Sent,Archive,Junk,Deleted,Receipts' && r.json[0].unread === 2 && r.json[0].id.startsWith(gm.id + '~'), r.json);