Fix calendar events & messages fetching + fix timeline design (#11840)

Preview : 

<img width="501" alt="Screenshot 2025-05-02 at 16 24 34"
src="https://github.com/user-attachments/assets/0c649df1-0e26-4ddc-8e13-ebd78af7ec09"
/>


Done : 
- Fix getCalendarEventsFromPersonIds and getCalendarEventsFromCompanyId
(include accountOwner check)
- Fix permission check on pre-hook - Pre-hook seems useless, calendar
events are always on METADATA or SHARE_EVERYTHING visibility, else post
hook always has the responsibility of returning the data user can
access. >> To delete or to keep in case other visibility options are
added ?
- Add post hook to secure finOne / findMany calendarEvents resolver
- Update design

To do :
- same on messages (PR to arrive)

closes : https://github.com/twentyhq/twenty/issues/9826

packages/twenty-server/src/engine/api/graphql/graphql-query-runner/interfaces/base-resolver-service.ts

@@ -183,7 +183,9 @@ export abstract class GraphqlQueryBaseResolverService<
         resultWithGettersArray,
       );
 
-      return resultWithGetters;
+      return Array.isArray(resultWithGetters)
+        ? resultWithGettersArray
+        : resultWithGettersArray[0];
     } catch (error) {
       workspaceQueryRunnerGraphqlApiExceptionHandler(error, options);
     }