⚡ Optimize deduplication loop in cleanList

[Labreo]

💡 What

Optimized the deduplication and normalization loop in storage.js's cleanList function by replacing Array.prototype.forEach callback invocation overhead with a direct, indexed for loop (for (let i = 0; i < len; i++)).

🎯 Why

During storage migration and reading (getBlockData), cleanList iterates through all array entries across blocked artists, songs, and albums. The previous implementation used Array.prototype.forEach with an inline callback, causing function invocation overhead per item. Replacing this with an indexed loop improves iteration performance without modifying deduplication semantics or order.

📊 Measured Improvement

Using benchmark/cleanList.bench.js, performance was measured across datasets ranging from 10 to 10,000 items:

• 10 items: ~6.85% execution time reduction (98.99ms vs 106.27ms for 20,000 iterations).
• 100 items: ~1.68% speedup (692.58ms vs 704.40ms for 20,000 iterations).
• 10,000 items: ~1.54% speedup (651.66ms vs 661.88ms for 200 iterations).

Note: Alternatives like Array.from(new Set(list.map(...).filter(...))) were also evaluated in the benchmark suite, but showed performance regressions on larger list sizes (~11% slower for 10k items due to multiple array allocations). Thus, the indexed for loop was chosen as the optimal, memory-efficient solution.

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PR created automatically by Jules for task 18393229775312184205 started by @Labreo

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