fix: EditableTable Cells from testing feedback

[snowystinger]

Closes

This changes from the popover to a true dialog for touch devices where a keyboard may come into view and mess with the scroll position.
It removes the intermediate ref from the examples and uses the form submission to track updated values.
Adds aria labels and better label examples.
Removes inverted row hover color.

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs

[rspbot]

## API Changes

@react-spectrum/s2

/@react-spectrum/s2:EditableCell

 EditableCell {
   align?: 'start' | 'center' | 'end' = 'start'
   children: ReactNode
   colSpan?: number
   id?: Key
   isSaving?: boolean
-  onSubmit: () => void
+  onSubmit: (Record<string, any>) => void
   renderEditing: () => ReactNode
   showDivider?: boolean
   textValue?: string
 }

---