Mail: Gmail and iCloud (IMAP/SMTP with app passwords) alongside Outlook.com, several accounts per person with an account switcher, From choice and combined unread

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

.gitea/workflows/build.yml

@@ -26,6 +26,7 @@ jobs:
       - run: node tools/player-test.js  # music player: queue, shuffle/repeat, stall recovery
       - run: node tools/lyrics-test.js  # lyrics: formats, wrong matches refused, remembered
       - run: node tools/mail-test.js    # Outlook.com mail through Microsoft Graph: connect, refresh, read, send, privacy
+      - run: node tools/mail-imap-test.js # Gmail and iCloud mail over IMAP/SMTP: connect, read, send, reply, privacy
       - run: node tools/signal-test.js  # Signal: linking, messages, sending, live updates
 
       - uses: docker/setup-qemu-action@v3