feature: add Svelte framework to app, refactor tracking panel into Svelte component

lib/frontend/index.js

@@ -0,0 +1,17 @@
+import App from './components/App.svelte'
+
+import * as stores from './stores'
+
+const boot = () => {
+  new App({
+    target: document.querySelector('#root'),
+  })
+
+  if (process.env.NODE_ENV === 'development') {
+    window._fb2ical = {
+      ...stores,
+    }
+  }
+}
+
+export default boot