fix(assets): use Vue 2.7.14 production build and expose window.wu_vue wrapper

tests/unit/VueBuild_Test.php

@@ -0,0 +1,22 @@
+<?php
+use PHPUnit\Framework\TestCase;
+
+final class VueBuild_Test extends TestCase {
+    public function test_vue_min_is_production_flags(): void {
+        $path = __DIR__ . '/../../assets/js/lib/vue.min.js';
+        $this->assertFileExists($path, 'vue.min.js does not exist');
+        $contents = file_get_contents($path);
+        $this->assertNotFalse($contents);
+        // Production build should set productionTip:false and devtools:false
+        $this->assertStringContainsString('productionTip:!1', $contents, 'Expected productionTip disabled in production build');
+        $this->assertStringContainsString('devtools:!1', $contents, 'Expected devtools disabled in production build');
+    }
+
+    public function test_vue_min_has_wu_vue_wrapper(): void {
+        $path = __DIR__ . '/../../assets/js/lib/vue.min.js';
+        $contents = file_get_contents($path);
+        $this->assertNotFalse($contents);
+        $this->assertStringContainsString('window.wu_vue', $contents, 'Expected window.wu_vue wrapper present');
+        $this->assertMatchesRegularExpression('/defineComponent/', $contents, 'Expected defineComponent to be exposed via wrapper');
+    }
+}