EPUB rendering improvements:
- Add margin-left/padding-left CSS parsing for block indentation
- Add vertical bar and italic styling for blockquotes
- Add left margin indentation for list items (ol/ul)
- Fix ordered lists showing bullets instead of numbers
- Fix nested <p> inside <li> causing marker on separate line
End-of-book improvements:
- Add "Start Over" option to wrap to first page when pressing next
- Show "Start Over" button hint on finished book prompt
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