⚡ Bolt: Optimize IconifyIcon prefixless lookups with memoization

[sshahriazz]

💡 What:
Introduced a module-level Map (iconCache) in client/src/components/base/IconifyIcon.tsx to memoize the results of the iconData() function.

🎯 Why:
The previous implementation invoked a fallback loop iterating over Object.entries(iconSets) (11 sets) whenever an icon without an explicit prefix was requested. In heavily populated UIs (like large menus, tables, and settings panels), this caused excessive array allocations and string manipulations on every re-render.

📊 Impact:
Reduces the time complexity of repetitive icon data lookups from O(N) to O(1). This eliminates a significant CPU overhead during render cycles where multiple generic icons are present, leading to faster component mounting and fewer main-thread blocking operations.

🔬 Measurement:
Since this project relies on Next.js, run pnpm --filter client build and verify that rendering and bundle optimizations succeed. Additionally, observing the UI locally when rendering large lists (like the Sidenav) will demonstrate reduced lag and CPU overhead.

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PR created automatically by Jules for task 11924295661522107414 started by @sshahriazz

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