feature: sync multiple tabs using local storage

lib/frontend/stores/configStore.js

@@ -6,24 +6,18 @@ const createConfigStore = () => {
   const { subscribe, set, update } = writable(state)
 
   const setValue = (key, value) => {
-    update((prevState) => {
-      const nextState = {
-        ...prevState,
-        [key]: value,
-      }
-
-      localStorage.setItem('fb-to-ical-config', JSON.stringify(nextState))
-
-      return nextState
-    })
+    update((prevState) => ({ ...prevState, [key]: value }))
   }
 
+  const getState = () => state
+
   return {
     ...state,
     subscribe,
     set,
     update,
     setValue,
+    getState,
   }
 }