Replace test framework: jest -> vitest (#281)

* Replace test framework: jest -> vitest

* nit - remove deprecated npm scripts

* Add vitest config

* Add a few basic tests

* Update actions with vitest params

* Add correct expectations

* Remove jest config

vite.config.mts

@@ -1,3 +1,4 @@
+/// <reference types='vitest' />
 import { defineConfig } from 'vite'
 import path from 'path'
 import dts from 'vite-plugin-dts'
@@ -27,8 +28,10 @@ export default defineConfig({
     }),
   ],
   resolve: {
-    alias: {
-      '@': '/src'
-    }
-  }
+    alias: { '@': '/src' },
+  },
+  test: {
+    alias: { '@': '../src' },
+    environment: 'jsdom',
+  },
 })