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-emphasis-position.js

@@ -0,0 +1,14 @@
+let Declaration = require('../declaration')
+
+class TextEmphasisPosition extends Declaration {
+  set(decl, prefix) {
+    if (prefix === '-webkit-') {
+      decl.value = decl.value.replace(/\s*(right|left)\s*/i, '')
+    }
+    return super.set(decl, prefix)
+  }
+}
+
+TextEmphasisPosition.names = ['text-emphasis-position']
+
+module.exports = TextEmphasisPosition