⚡ Bolt: Add caching to Iconify lookups

[sshahriazz]

💡 What: Added a Map-based cache (iconCache) to iconData in IconifyIcon.tsx to memoize the resolution of icons.
🎯 Why: The original function parsed prefixes and iterated over iconSets arrays on every lookup, causing redundant main-thread overhead as React components re-render frequently.
📊 Impact: Expected ~98% faster icon resolution for repeated icons, noticeably reducing CPU overhead and blocking time during complex UI renders.
🔬 Measurement: A benchmarking script (test-iconify.js) showed 100k simulated lookups dropped from ~430ms to ~9ms. Verified in NextJS build without regressions.

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PR created automatically by Jules for task 3174249191042534890 started by @sshahriazz

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