Translation on Firefox Translations models; new logo

- Email translation moves from LibreTranslate to our own translator
  service (translator/): Mozilla's Firefox Translations models on the
  Bergamot engine, fastText language detection (176 languages). Polish,
  English, German, French, Spanish and Italian on first start (~350 MB
  instead of ~10 GB); Admin panel > Email translation installs and
  removes languages. Built and pushed as the `translator` image.
- Every message is translated paragraph by paragraph as plain text;
  names travel with their sentence and are kept only where the model
  changed them; a sentence start the model copied ("Enclosed") is tried
  again in lower case; list markers are not sent
- The Translate button shows only for installed languages
- New logo: favicon, app/maskable/iPhone icons, notification badge,
  email logo and calendar copy regenerated; BIMI logo rebuilt in SVG
  Tiny PS with its gradients; masks render in browsers
- Launch screen background is the app's dark grey

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

deploy/build-push.sh

@@ -43,15 +43,17 @@ build() {
         "$ROOT_DIR"
 }
 
-build backend Dockerfile.backend
-build web     Dockerfile.frontend
+build backend    Dockerfile.backend
+build web        Dockerfile.frontend
+build translator Dockerfile.translator
 
 if [ "$MODE" = "--save" ]; then
     out="${ROOT_DIR}/webmail-${TAG}.tar"
-    echo "== saving both images to ${out}"
+    echo "== saving the images to ${out}"
     docker save -o "$out" \
         "${REGISTRY_PREFIX}/backend:${TAG}" \
-        "${REGISTRY_PREFIX}/web:${TAG}"
+        "${REGISTRY_PREFIX}/web:${TAG}" \
+        "${REGISTRY_PREFIX}/translator:${TAG}"
     echo "done. Copy it to the NAS and run: docker load -i $(basename "$out")"
     exit 0
 fi
@@ -72,6 +74,8 @@ fi
 echo "== pushing"
 docker push "${REGISTRY_PREFIX}/backend:${TAG}"
 docker push "${REGISTRY_PREFIX}/web:${TAG}"
+docker push "${REGISTRY_PREFIX}/translator:${TAG}"
 docker push "${REGISTRY_PREFIX}/backend:latest"
 docker push "${REGISTRY_PREFIX}/web:latest"
+docker push "${REGISTRY_PREFIX}/translator:latest"
 echo "pushed ${TAG}. On the NAS: ./deploy/webmail.sh update ${TAG}"