fix: date pickers clear

[wysher]

this PR solves two issues:

• clearing value for date range field https://github.com/huntabyte/bits-ui/issues/391
• clearing value for date picker when value is set to undefined (not reported. Currently clearing value works only when is set to null, but this will cause TS error)

I still have issue with date range field which will not clear segments even when value, startValue and endValue clears (for date field it works fine). I'm not sure how segments get updates after value changes - I need some help here. Maybe it must be done on melt-ui.

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[huntabyte]

Hey @wysher thanks a ton for this! Would you mind adding a regression test to the tests for this? Just to ensure we know it doesn't break in the future!

[wysher]

Hey @huntabyte. I don't mind adding test cases, but there's no tests for date pickers at the moment and sadly I don't have enough time to write them from scratch.

I've checked issue with refreshing input segments when date-range-field value was cleared on melt-ui, and issue repeats there. So, most likely it needs to be fixed on melt-ui.

[huntabyte]

No worries, I will give this a review soon to confirm everything looks good!