feat: add proper favicon set from RealFaviconGenerator

Replace inline emoji favicon with full cross-platform favicon support
including SVG, PNG, ICO, Apple touch icon, and PWA manifest icons.

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

src/app.html

@@ -6,10 +6,12 @@
     <meta name="theme-color" content="#f0e6d3" />
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
-    <link
-      rel="icon"
-      href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🥨</text></svg>"
-    />
+    <link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <link rel="shortcut icon" href="/favicon.ico" />
+    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
+    <meta name="apple-mobile-web-app-title" content="Crumbs" />
+    <link rel="manifest" href="/site.webmanifest" />
     <title>Crumbs</title>
     %sveltekit.head%
   </head>

static/site.webmanifest

@@ -0,0 +1,21 @@
+{
+  "name": "Crumbs by Bretzel",
+  "short_name": "Crumbs",
+  "icons": [
+    {
+      "src": "/web-app-manifest-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/web-app-manifest-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "theme_color": "#f9f4ea",
+  "background_color": "#f9f4ea",
+  "display": "standalone"
+}