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/mz/crypto.js

@@ -0,0 +1,9 @@
+
+require('thenify-all').withCallback(
+  require('crypto'),
+  exports, [
+    'pbkdf2',
+    'pseudoRandomBytes',
+    'randomBytes'
+  ]
+)