CalendarView: Tooltip is not provided for "Next" and "Previous" month buttons.

[YuliKl]

Describe the bug

Steps to reproduce the bug

Steps to reproduce the behavior:

1. Open Xaml Controls Gallery and navigation to CalendarView page
2. Navigate to Previous, Next buttons
3. Observe the issue.

Expected behavior

Tooltip should be provided for "Next" and "Previous" month buttons.

Screenshots

Additional context

Copied from internal bug

[mdtauk]

As you have access to the month names, should they not be in the tooltip/accessibility name?

                        (Previous: February)     (Next: April)
March                           🔺                    🔻

[StephenLPeters]

I think that would be awesome, but probably requires winui 3. we can get static labels in winui2

[Felix-Dev]

Binding the button tooltip content to the UIA name property of the respective button will give us "Previous" and "Next" as tooltips. Seems fine for now and we can add the month name once WinUI 3 has been open-sourced (for which we should create a new tracking item/proposal).

I would like to work on this.

@StephenLPeters @YuliKl How about adding a tooltip for the CalendarView's "header" button as well?

Perhaps "Month view"/"Year view" (depending on how interpreted "Year view"/"Decade view" could also be used). This would require winui 3 though and the UIA name property of that button also isn't set. This wasn't flagged as an accessibility issue yet, but it's not looking unreasonable to me.

[github-actions]

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