fix: update test cases to match new UI labels

- Update RepeatEvent.test.tsx to use correct selectors and text matching
- Update EventDisplay.test.tsx to use 'Notification' instead of 'Alarm'
- Update EventModal.test.tsx to use new label names and fix description input tests
- Update Calendar.test.tsx to use new placeholder text 'Start typing a name or email'
- Fix EventDisplay.tsx to use 'Notification' label consistently

__test__/components/Calendar.test.tsx

@@ -217,7 +217,7 @@ describe("calendar Availability search", () => {
 
     renderWithProviders(<CalendarTestWrapper />, preloadedState);
 
-    const input = screen.getByPlaceholderText(/search user/i);
+    const input = screen.getByPlaceholderText(/start typing a name or email/i);
     userEvent.type(input, "New");
 
     const option = await screen.findByText("New User");
@@ -242,7 +242,7 @@ describe("calendar Availability search", () => {
       });
     renderWithProviders(<CalendarTestWrapper />, preloadedState);
 
-    const input = screen.getByPlaceholderText(/search user/i);
+    const input = screen.getByPlaceholderText(/start typing a name or email/i);
     userEvent.type(input, "Alice");
 
     const option = await screen.findByText("Alice");