fix(date-picker): support both input typing and calendar picking

• Replace button trigger with text input + calendar icon in form DatePickerField and table header DateFilterPopover
• Auto-insert slashes as user types DD/MM/YYYY format
• Fix calendar dropdown closing: remove modal prop, use explicit close via onPointerDownOutside/onEscapeKeyDown, prevent onFocusOutside to keep calendar month/year selects working
• Apply same fix to DateRoadMapFilterPopover

Closes VSN-2513