chore: modernize setup, dependencies, and project docs

vitest.config.ts

@@ -1,34 +1,34 @@
-import { defineConfig } from 'vitest/config';
+import { defineConfig } from "vitest/config";
 
 export default defineConfig({
   test: {
-    // Use happy-dom for browser API simulation
-    environment: 'happy-dom',
-    
+    // Node runtime is a better match for Worker route/unit tests
+    environment: "node",
+
     // Include source files for coverage
-    include: ['src/**/*.{test,spec}.{js,ts}'],
-    
+    include: ["src/**/*.{test,spec}.{js,ts}"],
+
     // Coverage configuration
     coverage: {
-      provider: 'v8',
-      reporter: ['text', 'json', 'html'],
-      include: ['src/**/*.ts'],
+      provider: "v8",
+      reporter: ["text", "json", "html"],
+      include: ["src/**/*.ts"],
       exclude: [
-        'src/**/*.{test,spec}.ts',
-        'src/types/**',
-        'src/scripts/**',
-        'src/styles/**'
-      ]
+        "src/**/*.{test,spec}.ts",
+        "src/types/**",
+        "src/scripts/**",
+        "src/styles/**",
+      ],
     },
-    
+
     // Global setup files
-    setupFiles: ['src/test/setup.ts'],
-    
+    setupFiles: ["src/test/setup.ts"],
+
     // Mock Cloudflare Workers runtime
     globals: true,
-    
+
     // Timeouts
     testTimeout: 10000,
-    hookTimeout: 10000
-  }
+    hookTimeout: 10000,
+  },
 });