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/HeartIcon.js

@@ -0,0 +1,22 @@
+const React = require("react");
+function HeartIcon({
+  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", {
+    d: "M2 6.342a3.375 3.375 0 0 1 6-2.088 3.375 3.375 0 0 1 5.997 2.26c-.063 2.134-1.618 3.76-2.955 4.784a14.437 14.437 0 0 1-2.676 1.61c-.02.01-.038.017-.05.022l-.014.006-.004.002h-.002a.75.75 0 0 1-.592.001h-.002l-.004-.003-.015-.006a5.528 5.528 0 0 1-.232-.107 14.395 14.395 0 0 1-2.535-1.557C3.564 10.22 1.999 8.558 1.999 6.38L2 6.342Z"
+  }));
+}
+const ForwardRef = /*#__PURE__*/ React.forwardRef(HeartIcon);
+module.exports = ForwardRef;