fix(frame-card): cap portrait preview to 40dvh so cards stop dominating

Portrait frames (3:5 aspect) at full card width were rendering 600px tall
and pushing the body well off-screen. Cap preview max-height at 40dvh and
switch the img sizing to max-width/max-height: 100% with auto width/height
— photo scales to fit inside the capped preview at its native aspect, with
narrow grey side bars filling the leftover horizontal space. Landscape
frames are short enough that the cap never engages.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

public/build/index.html

@@ -14,7 +14,7 @@
     <meta name="mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="default" />
     <meta name="apple-mobile-web-app-title" content="pictureFrame" />
-    <script type="module" crossorigin src="/build/assets/index-A8eJwVl8.js"></script>
+    <script type="module" crossorigin src="/build/assets/index-CKYLXL2q.js"></script>
     <link rel="modulepreload" crossorigin href="/build/assets/_plugin-vue_export-helper-DVo1OUMD.js">
     <link rel="stylesheet" crossorigin href="/build/assets/index-BlLBHR1q.css">
   </head>