Make pedagogical scaffolding controls collapsible (power user feature):
- Pedagogical Scaffolding section collapsed by default
- Live Preview nested inside, also collapsed by default
- Use Radix UI Collapsible for smooth accordion behavior
Changes:
- Add DisplayControlsPanel component with collapsible sections
- Pedagogical Scaffolding header with "(Advanced)" label
- Live Preview header with "(Optional)" label
- Animated arrow indicators for expand/collapse state
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Co-Authored-By: Claude <noreply@anthropic.com>
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