Remove Redundant "Show Answer" Button in Practice Mode

[0010aor]

Description

In the practice mode interface, the "Show Answer" button is redundant because clicking the card itself already reveals the answer. This button should be removed to simplify the interface.

Current Behavior

• Practice mode displays both the card (clickable to flip) and a separate "Show Answer" button.

Expected Behavior

• Only the card flipping mechanism (clicking the card) is used to reveal the answer.
• The explicit "Show Answer" button is removed.