Calendar Month and Year view multi-modal keyboard navigation doesn't work due to focus handling

[damyanpetev]

Description

Can't continue with KB navigation after clicking inside a Calendar Month or Year view.

• igniteui-angular version: 18.1.x at least
• browser: N/A

Steps to reproduce

1. Open https://www.infragistics.com/products/ignite-ui-angular/angular/components/calendar#angular-calendar-views
   OR https://stackblitz.com/edit/ecaxc2 (Month View cached fork)
   OR https://stackblitz.com/edit/nuyftt (Year View cached fork)
2. Click on any month/year item
3. Attempt to continue navigation with KB arrows for example

Result

KB nav doesn't work because the month/year view doesn't gain focus. Best guess atm there's a mousedown handler that prevents default so the wrapper container with tabindex="0" won't gain focus automatically and no logic backfills this behavior. If you click in-between items the view gains focus, which seems like a confirmation.

Expected result

The view should gain focus when interacted with pointer and allow navigation to continue with KB.

Attachments

Attach a sample if available, and screenshots, if applicable.