[Usability/Accessibility/] Tab key navigation not supported between fields in records and tables

Twenty currently does not support using the Tab key to move between fields when editing a record or navigating cells in a table view. This is a significant accessibility issue.

Pressing Tab while editing a field in a record or table does not advance focus to the next field/cell.
Users must use the mouse to click into each field individually.

Expected behavior:
Tab should move focus to the next field/cell.
Shift+Tab should move focus to the previous field/cell.
Enter and arrow key behavior should follow standard data-grid conventions (consistent with Excel, Google Sheets, Airtable, Notion, etc.).