Resize avatar images before embedding

Source media files can easily be multiple megabytes — embedding
the originals made a per-recipient email balloon to 10MB+. Each
avatar is now cover-cropped to 96x96 (HiDPI for the rendered
48px circle) and re-encoded as JPEG q=75 via Intervention\Image,
which webtrees already depends on. Typical avatar payload drops
from megabytes to ~5-15KB.

Falls back to the original bytes (with a log warning) if neither
Imagick nor GD is loaded — better an oversized email than none.

src/Services/NewsletterDispatchService.php

@@ -17,6 +17,10 @@ use Fisharebest\Webtrees\Services\UserService;
 use Fisharebest\Webtrees\Tree;
 use Fisharebest\Webtrees\User;
 use Illuminate\Support\Collection;
+use Intervention\Image\Drivers\Gd\Driver as GdDriver;
+use Intervention\Image\Drivers\Imagick\Driver as ImagickDriver;
+use Intervention\Image\Encoders\JpegEncoder;
+use Intervention\Image\ImageManager;
 use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
 use Symfony\Component\Mime\Exception\RfcComplianceException;
 use Throwable;
@@ -38,6 +42,22 @@ final class NewsletterDispatchService
      */
     private const string FROM_NAME = 'webtrees newsletter';
 
+    /**
+     * Target dimensions for embedded avatars, in pixels. Rendered at 48
+     * CSS pixels, so 96 covers HiDPI displays. Larger source images are
+     * cover-cropped down; smaller ones are left untouched.
+     */
+    private const int AVATAR_SIZE = 96;
+
+    /**
+     * JPEG quality used when re-encoding resized avatars. 75 is a good
+     * size/quality trade-off for small portraits.
+     */
+    private const int AVATAR_JPEG_QUALITY = 75;
+
+    private ImageManager|null $image_manager = null;
+    private bool              $image_manager_resolved = false;
+
     public function __construct(
         private readonly EventQueryService $event_query_service,
         private readonly NewsletterMailer  $mailer,
@@ -293,12 +313,80 @@ final class NewsletterDispatchService
             return null;
         }
 
+        $resized = $this->resizeAvatar($bytes);
+
+        if ($resized !== null) {
+            return $resized;
+        }
+
+        // Fall back to the original bytes if no image library is
+        // available — better an oversized email than no avatar at all.
         return [
             'bytes' => $bytes,
             'mime'  => $media_file->mimeType() ?: 'application/octet-stream',
         ];
     }
 
+    /**
+     * Cover-crop the source image to a small square and re-encode it
+     * as JPEG. Drops a multi-MB source down to ~5–15 KB.
+     *
+     * Returns null if no image library is loaded (in which case the
+     * caller keeps the original bytes), or if Intervention failed to
+     * read the file.
+     *
+     * @return array{bytes:string,mime:string}|null
+     */
+    private function resizeAvatar(string $bytes): array|null
+    {
+        $manager = $this->imageManager();
+
+        if ($manager === null) {
+            return null;
+        }
+
+        try {
+            $image   = $manager->read($bytes);
+            $encoded = $image
+                ->cover(self::AVATAR_SIZE, self::AVATAR_SIZE)
+                ->encode(new JpegEncoder(self::AVATAR_JPEG_QUALITY))
+                ->toString();
+        } catch (Throwable $ex) {
+            Log::addErrorLog('Newsletter avatar resize failed: ' . $ex->getMessage());
+            return null;
+        }
+
+        return [
+            'bytes' => $encoded,
+            'mime'  => 'image/jpeg',
+        ];
+    }
+
+    /**
+     * Lazily build (and cache) an Intervention ImageManager, preferring
+     * Imagick over GD — mirrors what webtrees' own ImageFactory does.
+     * Returns null if neither extension is present so the caller can
+     * gracefully fall back to the original image bytes.
+     */
+    private function imageManager(): ImageManager|null
+    {
+        if (!$this->image_manager_resolved) {
+            $this->image_manager_resolved = true;
+
+            if (extension_loaded('imagick')) {
+                $this->image_manager = new ImageManager(new ImagickDriver());
+            } elseif (extension_loaded('gd')) {
+                $this->image_manager = new ImageManager(new GdDriver());
+            } else {
+                Log::addErrorLog(
+                    'Newsletter: neither Imagick nor GD is available; avatars will be embedded at their original size.',
+                );
+            }
+        }
+
+        return $this->image_manager;
+    }
+
     /**
      * Build the map the view consults: xref -> CID name. Only entries
      * for individuals with a successfully resolved avatar are present;