fix: Improve accessibility of FieldDate

[gonfunko]

The basics

• I validated my changes

The details

Proposed Changes

This PR improves the accessibility of FieldDate. Specifically, it:

• Indicates the field's type as "date"
• Customizes the ARIA label to use a localized, long-form description of the date, like "January 23, 2024" rather than "1/23/2024" (or local equivalent) which may be read out as "one slash twenty three slash two thousand twenty four", to improve understandability.

9986 is also needed to make this field accessible; without it, the value cannot be committed via the keyboard.