Add unit tests for colorUtils and MusicData (38 tests), add vitest config

frontend/vitest.config.ts

@@ -0,0 +1,14 @@
+import { defineConfig } from "vitest/config";
+import { resolve } from "path";
+
+export default defineConfig({
+  test: {
+    environment: "node",
+    passWithNoTests: true,
+  },
+  resolve: {
+    alias: {
+      "@bach-to-basics/shared": resolve(__dirname, "../shared/types/index.ts"),
+    },
+  },
+});