Fixed hook order crash when reduced motion or empty data is active

[rahulKarnati181]

Problem
The app crashed with “Rendered fewer hooks than expected” when certain slides activated.
This happened because some background components returned early before calling hooks,
causing hook order mismatches between renders.

Solution

• Ensured hooks are always called unconditionally
• Moved early returns to after hooks
• useMemo now safely returns empty arrays when reduced motion is enabled
• Prevented modulo by zero when emojis array is empty

Result

• No hook order mismatch
• No blank screen when navigating between slides