docs(design): remove SVG, use PNG logo only

SVG icon is no longer in use. public/logo.png (1024x1024 RGBA) is
the single logo asset. DESIGN.md updated accordingly: SVG snippet
removed, wordmark pattern and <head> references updated to PNG.

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

node_modules/@heroicons/react/solid/index.js

@@ -0,0 +1,16 @@
+let proxy = new Proxy(
+  {},
+  {
+    get: (obj, property) => {
+      if (property === '__esModule') {
+        return {}
+      }
+
+      throw new Error(
+        `You\'re trying to import \`@heroicons/react/solid/${property}\` from Heroicons v1 but have installed Heroicons v2. Install \`@heroicons/react@v1\` to resolve this error.`
+      )
+    },
+  }
+)
+
+module.exports = proxy