test: implement tests

vitest.config.ts

@@ -0,0 +1,30 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "jsdom",
+    globals: true,
+    // Remove setupFiles temporarily to test basic functionality
+    coverage: {
+      provider: "v8",
+      reporter: ["text", "json", "html"],
+      exclude: ["node_modules/**", ".svelte-kit/**", "tests/**", "*.config.ts", "*.config.js", "static/**"],
+      thresholds: {
+        global: {
+          branches: 80,
+          functions: 80,
+          lines: 80,
+          statements: 80,
+        },
+      },
+    },
+  },
+  resolve: {
+    alias: {
+      $lib: "/src/lib",
+      $components: "/src/components",
+      $stores: "/src/stores",
+      $services: "/src/services",
+    },
+  },
+});