fix: clamp month navigation to min/max to prevent snap-back (#6290)

[GauravDhuri]

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Description

Linked issue: #6290

Problem
When we pick a month from the month dropdown, the calendar sometimes jumps to that month for a moment and then snaps back to the month we were already on.

Changes

• Clamp the navigated date into [minDate, maxDate] before passing it to handleCustomMonthChange/setPreSelection. This keeps the target date selectable, so the view stays n the picked month and onMonthChange fires exactly once with the correct math.
• Regression test covering navigation to a month with no selectable day near the maxDate boundary.

Screenshots

Datepicker.month.snapback.-.Fix.mov

To reviewers

Contribution checklist

• I have followed the contributing guidelines.
• I have added sufficient test coverage for my changes.
• I have formatted my code with Prettier and checked for linting issues with ESLint for code readability.