Mail: instant first paint from the last saved accounts, folders and list; Outlook folders in one batched call; gzip for app files and large mail responses

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

tools/mail-test.js

@@ -42,6 +42,7 @@ const SECRET = 'mail-test-secret-'.repeat(3);
     const tok = (rq.headers.authorization || '').replace('Bearer ', '');
     if (!ms.goodTokens.has(tok)) return out(rs, 401, { error: { code: 'InvalidAuthenticationToken', message: 'expired' } });
     const g = p.slice(5);
+    if (g === '/$batch' && rq.method === 'POST') { ms.batches = (ms.batches || 0) + 1; const reqs = JSON.parse(b).requests, self = `http://127.0.0.1:${server.address().port}/v1.0`; const responses = []; for (const q of reqs) { const r = await fetch(self + q.url, { method: q.method, headers: { authorization: rq.headers.authorization } }); responses.push({ id: q.id, status: r.status, body: await r.json().catch(() => ({})) }); } return out(rs, 200, { responses }); }
     if (g === '/me') return out(rs, 200, { displayName: 'Nate', mail: 'nate@outlook.com' });
     let m;
     if ((m = /^\/me\/mailFolders\/(\w+)$/.exec(g))) { const f = { inbox: folder('inbox', 'Inbox', 3, 10), drafts: folder('drafts', 'Drafts', 0, 1), sentitems: folder('sentitems', 'Sent Items', 0, 4), archive: folder('archive', 'Archive', 0, 0), junkemail: folder('junkemail', 'Junk Email', 0, 0), deleteditems: folder('deleteditems', 'Deleted Items', 0, 2) }[m[1]]; return f ? out(rs, 200, f) : out(rs, 404, { error: { message: 'no folder' } }); }
@@ -101,7 +102,8 @@ const SECRET = 'mail-test-secret-'.repeat(3);
   r = await call('uann', '/api/mail/messages'); ok("and cannot read it", r.status === 409, r.status);
 
   // ================= reading =================
-  r = await call('unate', '/api/mail/folders'); const names = (r.json || []).map(f => f.name);
+  ms.batches = 0; r = await call('unate', '/api/mail/folders'); const names = (r.json || []).map(f => f.name);
+  ok('the folder list costs one batched call to Microsoft, not seven', ms.batches === 1, ms.batches);
   ok('folders: the usual six first with unread counts, then your own; internal ones hidden', names.slice(0, 6).join() === 'Inbox,Drafts,Sent,Archive,Junk,Deleted' && names.includes('Receipts') && !names.includes('Outbox') && r.json[0].unread === 3 && names.filter(n => n === 'Inbox').length === 1, r.json);
   r = await call('unate', '/api/mail/messages?folder=inbox'); ok('the inbox lists messages, newest first, with who, read state and attachment flag', r.status === 200 && r.json.items.length === 2 && r.json.items[0].from.address === 'ann@example.com' && r.json.items[0].read === false && r.json.items[0].attach === true && r.json.items[1].flagged === true, r.json);
   ok('and says there may be more', r.json.more === true && r.json.next === 2, r.json);