Add Copy/Ask AI actions to Exam Result and Card Review pages

[pasc4le]

What

Add Copy and Ask AI actions to questions on:

1. Exam Result page — after completing an exam
2. Cards Review page — only after a card has been answered

These actions already exist on the active Exam page and should follow the same pattern.

Acceptance criteria

• Copy/Ask AI buttons render on each question in the Exam Result page
• Copy/Ask AI buttons render on answered cards in the Cards Review page
• Buttons are hidden for unanswered cards in the Cards Review page
• Behavior matches the existing Exam page implementation

[opencode-agent]

github run