feat: Save rich content editor state to user.uiSettings (#1736)

Co-authored-by: Nithin David Thomas <webofnithin@gmail.com>

app/javascript/dashboard/mixins/uiSettings.js

@@ -0,0 +1,19 @@
+import { mapGetters } from 'vuex';
+
+export default {
+  computed: {
+    ...mapGetters({
+      uiSettings: 'getUISettings',
+    }),
+  },
+  methods: {
+    updateUISettings(uiSettings = {}) {
+      this.$store.dispatch('updateUISettings', {
+        uiSettings: {
+          ...this.uiSettings,
+          ...uiSettings,
+        },
+      });
+    },
+  },
+};