Fix backend port handling, generation progress sync, and restore img2img UI

app/dist/index.html

@@ -8,7 +8,7 @@
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap" rel="stylesheet">
     <title>Local AI Image Generator</title>
-    <script type="module" crossorigin src="/assets/index-CL30r104.js"></script>
+    <script type="module" crossorigin src="/assets/index-DVJy0SBd.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-DW6G7wc2.css">
   </head>