⚡ Bolt: Optimize IconifyIcon lookup with in-memory caching

[sshahriazz]

💡 What: Added an in-memory cache (iconCache) to the custom IconifyIcon component (client/src/components/base/IconifyIcon.tsx) to store both successful and failed (null) icon lookups.
🎯 Why: The component previously iterated over 11 different icon sets (@iconify-json/...) to find prefix-less icons on every single render. Since icons are heavily used in lists, navigation, and common components, this resulted in thousands of redundant getIconData calls and loops during initial renders and updates.
📊 Impact: Reduces an $O(N)$ lookup across 11 dictionaries to an $O(1)$ dictionary lookup after the first render of any unique icon. Should significantly reduce JS execution time during page transitions and list rendering.
🔬 Measurement: Verify by placing a console.log inside the iconSets loop in IconifyIcon.tsx before and after this change. After the change, the loop will only run once per unique icon name for the entire lifecycle of the application.

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PR created automatically by Jules for task 3367771893545722268 started by @sshahriazz

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