⚡ Bolt: Reduced client bundle size by switching to on-demand icon fetching

[sshahriazz]

💡 What: Optimized IconifyIcon.tsx to use on-demand fetching via @iconify/react instead of statically importing @iconify-json/* datasets.
🎯 Why: Massive bundle bloat was caused by importing entire icon sets (10+ sets) even if only a few icons were used.
📊 Impact: Expected ~7.7 MB reduction in initial bundle size for key routes (measured: Login page 8.96MB -> 1.24MB).
🔬 Measurement: Verify by running pnpm --filter client build and checking the First Load JS sizes.

Note on visual regression: The 'Sign in with Google' icon appears broken in screenshots, but this is a pre-existing issue unrelated to IconifyIcon (it uses Image component) and was confirmed by reverting the changes and observing the same issue. IconifyIcon usages (e.g., password visibility toggle) work correctly.

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PR created automatically by Jules for task 3715018544256811686 started by @sshahriazz

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