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/util/isPlainObject.js

@@ -0,0 +1,17 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+Object.defineProperty(exports, "default", {
+    enumerable: true,
+    get: function() {
+        return isPlainObject;
+    }
+});
+function isPlainObject(value) {
+    if (Object.prototype.toString.call(value) !== "[object Object]") {
+        return false;
+    }
+    const prototype = Object.getPrototypeOf(value);
+    return prototype === null || Object.getPrototypeOf(prototype) === null;
+}