feat: improve video conference UI in EventModal

- Replace 'Meeting link generated' text with 'Join Visio conference' button
- Button opens video conference link in new tab when clicked
- Use contained variant styling to match Save button appearance
- Maintain copy and delete functionality for meeting links

src/components/Calendar/hooks/useCalendarEventHandlers.ts

@@ -1,5 +1,4 @@
 import { useCallback } from "react";
-import { CalendarApi } from "@fullcalendar/core";
 import {
   createEventHandlers,
   EventHandlersProps,

src/components/Calendar/hooks/useCalendarViewHandlers.ts

@@ -1,5 +1,4 @@
 import { useCallback } from "react";
-import { CalendarApi } from "@fullcalendar/core";
 import {
   createViewHandlers,
   ViewHandlersProps,