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/tailwindcss/lib/value-parser/walk.js

@@ -0,0 +1,16 @@
+"use strict";
+module.exports = function walk(nodes, cb, bubble) {
+    var i, max, node, result;
+    for(i = 0, max = nodes.length; i < max; i += 1){
+        node = nodes[i];
+        if (!bubble) {
+            result = cb(node, i, nodes);
+        }
+        if (result !== false && node.type === "function" && Array.isArray(node.nodes)) {
+            walk(node.nodes, cb, bubble);
+        }
+        if (bubble) {
+            cb(node, i, nodes);
+        }
+    }
+};