Remove scroll animation when opening calendar

[Copilot]

When navigating to the calendar page, the view animates smoothly to the target month. Changed to scroll instantly on initial render.

Changes

• Modified ScrollToOpenToDate() to pass smooth: false to ScrollToMonth()

// Before
Task ScrollToOpenToDate() => ScrollToMonth(OpenToDate.Month);

// After  
Task ScrollToOpenToDate() => ScrollToMonth(OpenToDate.Month, smooth: false);

The ScrollToMonth() method already supported instant scrolling via its smooth parameter (defaults to true). Navigation between months after initial render remains animated.

Original prompt

Remove the scroll animation when navigating to the calendar and just scroll to the month instantly

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