⚡ Bolt: Optimize map/flatMap loops in CategoryFilterWidget

[alazndy]

🎯 What: Consolidated redundant array iterations (.map(), .flatMap(), new Set()) used to derive activeCategories and uniqueProfiles from shortcuts into a single imperative for...of loop inside a single useMemo block in CategoryFilterWidget.

💡 Why: shortcuts can potentially be a large array. Running multiple chained .map() and .flatMap() operations iterates through the array multiple times and creates unnecessary intermediate array allocations before immediately collapsing them into Sets. Combining these into a single pass loop improves memory usage and CPU speed.

📊 Impact: A benchmark with 10,000 items showed a ~45% execution speedup per render cycle for this derivation logic (0.85ms vs 1.55ms).

🔬 Measurement: Created and ran a focused standalone benchmark script comparing the execution time of the previous approach vs the new approach using perf_hooks. Also verified compilation and builds pass successfully locally.

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PR created automatically by Jules for task 2166892038140130879 started by @alazndy

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