portfolio : fix gallery loading and optimize image sizes refs #59

- Remove GalleryAnimation preloading (was downloading full-size originals
  via new Image(), causing 5MB+ redundant downloads on top of WebP srcset)
- Gallery now shows immediately, images load lazily via DOM
- Force eager loading on mockup img when slide becomes active (fixes
  first-project gallery never showing — lazy img off-screen on bg slide)
- Resize all direct ->url() calls to appropriate display dimensions:
  gallery src 600px, mockup src 960px, backgrounds 1920px,
  play lettering 500px, play preview 1000px, team photos 400px

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

site/templates/about.json.php

@@ -18,7 +18,7 @@ $specificData = [
         return [
             'name'  => $file->memberName()->value(),
             'role'  => $file->role()->value(),
-            'photo' => $file->url(),
+            'photo' => $file->resize(400, null, 80)->url(),
             'link'  => $file->link()->value() ?: null,
         ];
     })->values()