feat: add next event indicator to Show Page Calendar tab (#4348)

* feat: add next event indicator to Show Page Calendar tab

Closes #4289

* feat: improve calendar animation

* refactor: add some utils and fix sorting edge case with full day

* refactor: rename CalendarCurrentEventIndicator to CalendarCurrentEventCursor

* fix: fix tests

* Fix lint

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/activities/calendar/contexts/CalendarContext.ts

@@ -0,0 +1,19 @@
+import { createContext } from 'react';
+
+import { CalendarEvent } from '@/activities/calendar/types/CalendarEvent';
+
+type CalendarContextValue = {
+  calendarEventsByDayTime: Record<number, CalendarEvent[] | undefined>;
+  currentCalendarEvent: CalendarEvent;
+  getNextCalendarEvent: (
+    calendarEvent: CalendarEvent,
+  ) => CalendarEvent | undefined;
+  updateCurrentCalendarEvent: () => void;
+};
+
+export const CalendarContext = createContext<CalendarContextValue>({
+  calendarEventsByDayTime: {},
+  currentCalendarEvent: {} as CalendarEvent,
+  getNextCalendarEvent: () => undefined,
+  updateCurrentCalendarEvent: () => {},
+});