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/text-decoration.js

@@ -0,0 +1,25 @@
+let Declaration = require('../declaration')
+
+const BASIC = [
+  'none',
+  'underline',
+  'overline',
+  'line-through',
+  'blink',
+  'inherit',
+  'initial',
+  'unset'
+]
+
+class TextDecoration extends Declaration {
+  /**
+   * Do not add prefixes for basic values.
+   */
+  check(decl) {
+    return decl.value.split(/\s+/).some(i => !BASIC.includes(i))
+  }
+}
+
+TextDecoration.names = ['text-decoration']
+
+module.exports = TextDecoration