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/supports-preserve-symlinks-flag/test/index.js

@@ -0,0 +1,29 @@
+'use strict';
+
+var test = require('tape');
+var semver = require('semver');
+
+var supportsPreserveSymlinks = require('../');
+var browser = require('../browser');
+
+test('supportsPreserveSymlinks', function (t) {
+	t.equal(typeof supportsPreserveSymlinks, 'boolean', 'is a boolean');
+
+	t.equal(browser, null, 'browser file is `null`');
+	t.equal(
+		supportsPreserveSymlinks,
+		null,
+		'in a browser, is null',
+		{ skip: typeof window === 'undefined' }
+	);
+
+	var expected = semver.satisfies(process.version, '>= 6.2');
+	t.equal(
+		supportsPreserveSymlinks,
+		expected,
+		'is true in node v6.2+, false otherwise (actual: ' + supportsPreserveSymlinks + ', expected ' + expected + ')',
+		{ skip: typeof window !== 'undefined' }
+	);
+
+	t.end();
+});