⚡ Bolt: Consolidate map/flatMap into single loop for CategoryFilterWidget

[alazndy]

🎯 What: Consolidates the calculation of activeCategories and uniqueProfiles in CategoryFilterWidget into a single useMemo block that iterates through the shortcuts array exactly once, replacing multiple chained array methods (.map(), .flatMap(), and converting to Set).

💡 Why: Chaining array methods introduces multiple iterations over the potentially large shortcuts array and creates unnecessary intermediate array and Set allocations. This can become a performance bottleneck. Consolidating into a single pass reduces both CPU overhead and memory churn.

📊 Impact: A benchmark simulating 10,000 shortcuts with multiple profiles showed execution time dropped from ~532ms to ~181ms (a ~66% reduction in calculation time).

🔬 Measurement: Verified using a standalone Node.js benchmark script (benchmark.cjs) with simulated data structures, and ran tsc --noEmit, pnpm run build and pnpm run build:store to confirm no type or build regressions.

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PR created automatically by Jules for task 4247440959969106123 started by @alazndy

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