[TheerasakPing]

💡 What:
Optimized the render loop in FileList.jsx by replacing O(M) Array.prototype.some searches inside the .map iteration with O(1) Set.has lookups. Created selectedPaths and cutPaths Sets memoized via useMemo.

🎯 Why:
For each item in sortedItems (N), the component was iterating through selectedItems (M1) and clipboard.items (M2). This created an O(N * (M1+M2)) complexity during the critical render phase, causing noticeable frame drops and slow interactions when navigating directories with hundreds or thousands of files with many files selected.

📊 Impact:
Reduces the computational complexity of rendering the file list from O(N*M) to O(N). This makes rendering virtually constant time with respect to the number of selected/cut items, eliminating UI jank when selecting multiple files in large directories.

🔬 Measurement:

1. Open a directory with 1000+ files.
2. Select 100+ items.
3. Observe React Profiler commit times during selection updates. Before this change, the FileList render time scaled linearly with selection size. After this change, it scales only with the visible/total items length.

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PR created automatically by Jules for task 12768537958252469048 started by @TheerasakPing

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