refactor: stabilize calendar loading effects and menubar redirect

- Memoize calendar range strings and stabilize effect deps
- Guard updateDarkColor to avoid dispatch loops
- Add resilient cache-clear handling with refs
- Memoize calendar/temp ids to prevent rerenders
- Update event handler hooks with missing deps
- Add guards and dependency fixes across Calendar effects

src/features/Events/EventModal.tsx

@@ -59,10 +59,10 @@ function EventPopover({
   const selectPersonalCalendars = createSelector(
     (state: any) => state.calendars,
     (calendars: any) =>
-      Object.keys(calendars.list)
+      Object.keys(calendars.list || {})
         .map((id) => {
           if (id.split("/")[0] === userId) {
-            return calendars.list[id];
+            return calendars.list?.[id];
           }
           return {} as Calendars;
         })

src/features/Events/ImportAlert.tsx

@@ -17,8 +17,8 @@ export default function ImportAlert() {
 
   return (
     <>
-      {Object.keys(calendars).map((calendarId) =>
-        calendars[calendarId]?.events
+      {Object.keys(calendars || {}).map((calendarId) =>
+        calendars?.[calendarId]?.events
           ? Object.keys(calendars[calendarId]?.events)
               .filter((id) => calendars[calendarId]?.events[id].error)
               .map((id) => {