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/autoprefixer/lib/hacks/user-select.js

@@ -0,0 +1,33 @@
+let Declaration = require('../declaration')
+
+class UserSelect extends Declaration {
+  /**
+   * Avoid prefixing all in IE
+   */
+  insert(decl, prefix, prefixes) {
+    if (decl.value === 'all' && prefix === '-ms-') {
+      return undefined
+    } else if (
+      decl.value === 'contain' &&
+      (prefix === '-moz-' || prefix === '-webkit-')
+    ) {
+      return undefined
+    } else {
+      return super.insert(decl, prefix, prefixes)
+    }
+  }
+
+  /**
+   * Change prefixed value for IE
+   */
+  set(decl, prefix) {
+    if (prefix === '-ms-' && decl.value === 'contain') {
+      decl.value = 'element'
+    }
+    return super.set(decl, prefix)
+  }
+}
+
+UserSelect.names = ['user-select']
+
+module.exports = UserSelect