⚡ Bolt: Optimize useQuestionsFirestore lookups (O(N) -> O(1))

[google-labs-jules]

💡 What: Replaced O(N) array filtering with O(1) Map lookups in useQuestionsFirestore hook.
🎯 Why: getQuestionsByWorld was performing a linear scan of all questions every time it was called. availableWorlds was also iterating all questions to find unique worlds.
📊 Impact: Lookups for world questions are now instantaneous (O(1)). World list generation is now O(W) instead of O(N) (where W is number of worlds).
🔬 Measurement: Verified with new unit test src/hooks/__tests__/useQuestionsFirestore.test.tsx ensuring correct Map population and retrieval.

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PR created automatically by Jules for task 6456320172949676878 started by @albertoivo

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