[P3] Enlarge tutorial step navigation hit areas #359

Priority

P3 - direct tutorial navigation is unnecessarily difficult on touch devices.

Evidence

The eight .tut-dot buttons measure 10 by 10 CSS pixels with about 7 pixels spacing, below the WCAG 2.2 target-size criterion.

Acceptance criteria

• Give each control at least a 24 by 24 active area or equivalent non-overlapping spacing.
• The visual dot may remain 10 pixels.
• Make the focus indicator cover the complete active area.