🚑 Fix timetable groups not getting saved

src/store.js

@@ -20,9 +20,13 @@ watch(classFilter, (newValue) => {
   localStorage.setItem("classFilter", newValue);
   fetchData(getNextAndPrevDay(selectedDate.value), false);
 });
-watch(timetableGroups, (newValue) => {
-  localStorage.setItem("timetableGroups", JSON.stringify(newValue));
-});
+watch(
+  timetableGroups,
+  (newValue) => {
+    localStorage.setItem("timetableGroups", JSON.stringify(newValue));
+  },
+  { deep: true }
+);
 watch(theme, (newValue) => {
   localStorage.setItem("theme", newValue);
 });