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/@heroicons/react/20/solid/esm/ChartBarIcon.js

@@ -0,0 +1,22 @@
+import * as React from "react";
+function ChartBarIcon({
+  title,
+  titleId,
+  ...props
+}, svgRef) {
+  return /*#__PURE__*/React.createElement("svg", Object.assign({
+    xmlns: "http://www.w3.org/2000/svg",
+    viewBox: "0 0 20 20",
+    fill: "currentColor",
+    "aria-hidden": "true",
+    "data-slot": "icon",
+    ref: svgRef,
+    "aria-labelledby": titleId
+  }, props), title ? /*#__PURE__*/React.createElement("title", {
+    id: titleId
+  }, title) : null, /*#__PURE__*/React.createElement("path", {
+    d: "M15.5 2A1.5 1.5 0 0 0 14 3.5v13a1.5 1.5 0 0 0 1.5 1.5h1a1.5 1.5 0 0 0 1.5-1.5v-13A1.5 1.5 0 0 0 16.5 2h-1ZM9.5 6A1.5 1.5 0 0 0 8 7.5v9A1.5 1.5 0 0 0 9.5 18h1a1.5 1.5 0 0 0 1.5-1.5v-9A1.5 1.5 0 0 0 10.5 6h-1ZM3.5 10A1.5 1.5 0 0 0 2 11.5v5A1.5 1.5 0 0 0 3.5 18h1A1.5 1.5 0 0 0 6 16.5v-5A1.5 1.5 0 0 0 4.5 10h-1Z"
+  }));
+}
+const ForwardRef = /*#__PURE__*/ React.forwardRef(ChartBarIcon);
+export default ForwardRef;