gmail sync: don't retry on overquota, import what we have

- OVERQUOTA from Gmail now continues to import step instead of retrying
- partial sync completion email tells user to try again in a few hours
- engine syncs handler meta to job on completion for richer notifications

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

src/workspaces/emailer/emails/JobCompleted.tsx

@@ -2,19 +2,39 @@ import Layout from 'emailer/emails/layouts/MainLayout.jsx';
 import { Container, Text } from '@react-email/components';
 
 type JobEmailData = {
-  job: { type: string; completedAt?: number };
+  job: { type: string; completedAt?: number; meta?: { gmailSyncPartial?: boolean; gmailSyncEmailCount?: number } };
 };
 
 const Email = ({ job }: JobEmailData) => {
+  const isPartialGmail = job?.type === 'gmail-sync' && job.meta?.gmailSyncPartial;
+
   return (
     <Layout>
       <Container>
-        <Text className="pt-4 text-2xl">Job Completed</Text>
-        <Text>
-          {job?.type === 'gmail-sync'
-            ? 'Your Google account is now completely synced.'
-            : `Your ${job?.type ?? 'unknown'} job has finished successfully.`}
-        </Text>
+        <Text className="pt-4 text-2xl">{isPartialGmail ? 'Gmail Sync Paused' : 'Job Completed'}</Text>
+        {job?.type === 'gmail-sync' ? (
+          isPartialGmail ? (
+            <>
+              <Text>
+                Gmail throttled the connection after downloading too many emails at once. This is normal for large
+                mailboxes — your emails have been imported successfully.
+              </Text>
+              {job.meta?.gmailSyncEmailCount ? (
+                <Text className="text-sm text-gray-600">
+                  {job.meta.gmailSyncEmailCount.toLocaleString()} emails downloaded so far.
+                </Text>
+              ) : null}
+              <Text className="text-sm text-gray-600">
+                Wait a few hours and run the sync again to continue downloading the rest. It will pick up where it left
+                off.
+              </Text>
+            </>
+          ) : (
+            <Text>Your Google account is now completely synced.</Text>
+          )
+        ) : (
+          <Text>Your {job?.type ?? 'unknown'} job has finished successfully.</Text>
+        )}
       </Container>
     </Layout>
   );