Add app icon, web app manifest

public/icons/icon-rounded.svg

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+<svg
+  width="1024"
+  height="1024"
+  viewBox="0 0 1024 1024"
+  xmlns="http://www.w3.org/2000/svg"
+>
+  <!-- Background -->
+  <rect
+    x="0"
+    y="0"
+    width="1024"
+    height="1024"
+    rx="220"
+    fill="#F6E9A6"
+  />
+
+  <!-- Subtle map grid (kept well outside safe zone) -->
+  <g stroke="#E6D88A" stroke-width="10" opacity="0.6">
+    <line x1="256" y1="0" x2="256" y2="1024" />
+    <line x1="512" y1="0" x2="512" y2="1024" />
+    <line x1="768" y1="0" x2="768" y2="1024" />
+
+    <line x1="0" y1="256" x2="1024" y2="256" />
+    <line x1="0" y1="512" x2="1024" y2="512" />
+    <line x1="0" y1="768" x2="1024" y2="768" />
+  </g>
+
+  <!-- Location pin (exact app shape, larger, centered, safe-zone compliant) -->
+  <!-- Safe zone target: ~680px diameter -->
+  <g
+    transform="
+      translate(512 512)
+      scale(22)
+      translate(-12 -12)
+    "
+    fill="#ea4335"
+    stroke="#b31412"
+    stroke-width="1"
+    stroke-linecap="round"
+    stroke-linejoin="round"
+  >
+    <path d="M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z" />
+    <circle cx="12" cy="10" r="3" fill="#b31412" stroke="none" />
+  </g>
+</svg>

public/icons/icon.svg

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+<svg
+  width="1024"
+  height="1024"
+  viewBox="0 0 1024 1024"
+  xmlns="http://www.w3.org/2000/svg"
+>
+  <!-- Background -->
+  <rect
+    x="0"
+    y="0"
+    width="1024"
+    height="1024"
+    fill="#F6E9A6"
+  />
+
+  <!-- Subtle map grid (kept well outside safe zone) -->
+  <g stroke="#E6D88A" stroke-width="10" opacity="0.6">
+    <line x1="256" y1="0" x2="256" y2="1024" />
+    <line x1="512" y1="0" x2="512" y2="1024" />
+    <line x1="768" y1="0" x2="768" y2="1024" />
+
+    <line x1="0" y1="256" x2="1024" y2="256" />
+    <line x1="0" y1="512" x2="1024" y2="512" />
+    <line x1="0" y1="768" x2="1024" y2="768" />
+  </g>
+
+  <!-- Location pin (exact app shape, larger, centered, safe-zone compliant) -->
+  <!-- Safe zone target: ~680px diameter -->
+  <g
+    transform="
+      translate(512 512)
+      scale(22)
+      translate(-12 -12)
+    "
+    fill="#ea4335"
+    stroke="#b31412"
+    stroke-width="1"
+    stroke-linecap="round"
+    stroke-linejoin="round"
+  >
+    <path d="M21 10c0 7-9 13-9 13s-9-6-9-13a9 9 0 0 1 18 0z" />
+    <circle cx="12" cy="10" r="3" fill="#b31412" stroke="none" />
+  </g>
+</svg>

public/manifest.webmanifest

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+{
+  "name": "Marco",
+  "short_name": "Marco",
+  "description": "Marco (as in Marco Polo) is an unhosted maps application that respects your privacy and choices",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#F6E9A6",
+  "theme_color": "#F6E9A6",
+  "icons": [
+    {
+      "src": "/icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/icon-maskable.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ]
+}