Feature: Add favicon and PWA manifest for better branding

Added favicon support with multiple sizes for different platforms (16x16, 32x32, 180x180 for Apple, 192x192 and 512x512 for Android). Includes PWA manifest.json for standalone app display with Bootstrap primary theme color.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/static/manifest.json

@@ -0,0 +1,19 @@
+{
+  "name": "mc-webui",
+  "short_name": "mc-webui",
+  "icons": [
+    {
+      "src": "/static/images/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/static/images/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "theme_color": "#0d6efd",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}

app/templates/base.html

@@ -5,6 +5,13 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
     <title>{% block title %}mc-webui{% endblock %}</title>
 
+    <!-- Favicon -->
+    <link rel="apple-touch-icon" sizes="180x180" href="{{ url_for('static', filename='images/apple-touch-icon.png') }}">
+    <link rel="icon" type="image/png" sizes="32x32" href="{{ url_for('static', filename='images/favicon-32x32.png') }}">
+    <link rel="icon" type="image/png" sizes="16x16" href="{{ url_for('static', filename='images/favicon-16x16.png') }}">
+    <link rel="manifest" href="{{ url_for('static', filename='manifest.json') }}">
+    <link rel="shortcut icon" href="{{ url_for('static', filename='favicon.ico') }}">
+
     <!-- Bootstrap 5 CSS -->
     <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
     <!-- Bootstrap Icons -->