UI - Date Picker | Enhancements

**Figma File** | [Components 2.0: Date Picker](https://www.figma.com/design/I1nuD0lJB9scfCVLdoWe7P/Components--2.0-?node-id=3844-10191)

### Summary
The date picker component is missing several accessibility and functionality fixes, identified during design review of Components 2.0: Date Picker.

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- [ ] **Enable manual date entry**

Allow the person to click or Tab into the field and type a date directly, in addition to selecting via the calendar.

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- [ ] **Custom SR announcement when clicking/tabbing into the date picker field**

Add an announcement so screen reader users know when the calendar has appeared, since focus stays on the field rather than moving into the grid.

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- [ ] **Date format needs to be updated to Month DD, YYYY**

Update the field's expected/displayed format to Month DD, YYYY (e.g., "January 1, 2026"), consistent with the format hint already shown below the field.

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- [ ] **Tab Focus styling buttons**

Make sure tab focus styling is visible for buttons:
- calendar (Prev/Next/month-year/ controls)
- (x) clear button
- calendar icon

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- [ ] **(X) button and Calendar icon is selectable**

- Include an X button to clear the field once a date is entered or selected, not currently included in this iteration.
- Confirm the calendar icon can be activated by mouse, touch, and keyboard.
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- [ ] **Accept loose typed date formats**

Allow the field to accept multiple common date formats when typed, similar to Eve's effective date work, including:
- 2006-01-01
- Jan 01 2006
- Jan 01, 2006
- January 01, 2006
- 01/01/2006

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- [ ] Option to disable future or past dates

- [ ] Validation is still displayed when the date is selected from the date picker until the user clicks elsewhere on the screen.