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/16/solid/esm/GiftIcon.js

@@ -0,0 +1,26 @@
+import * as React from "react";
+function GiftIcon({
+  title,
+  titleId,
+  ...props
+}, svgRef) {
+  return /*#__PURE__*/React.createElement("svg", Object.assign({
+    xmlns: "http://www.w3.org/2000/svg",
+    viewBox: "0 0 16 16",
+    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", {
+    fillRule: "evenodd",
+    d: "M3.75 3.5c0 .563.186 1.082.5 1.5H2a1 1 0 0 0 0 2h5.25V5h1.5v2H14a1 1 0 1 0 0-2h-2.25A2.5 2.5 0 0 0 8 1.714 2.5 2.5 0 0 0 3.75 3.5Zm3.499 0v-.038A1 1 0 1 0 6.25 4.5h1l-.001-1Zm2.5-1a1 1 0 0 0-1 .962l.001.038v1h.999a1 1 0 0 0 0-2Z",
+    clipRule: "evenodd"
+  }), /*#__PURE__*/React.createElement("path", {
+    d: "M7.25 8.5H2V12a2 2 0 0 0 2 2h3.25V8.5ZM8.75 14V8.5H14V12a2 2 0 0 1-2 2H8.75Z"
+  }));
+}
+const ForwardRef = /*#__PURE__*/ React.forwardRef(GiftIcon);
+export default ForwardRef;