⚡ Bolt: Add .lazy to chained array transformations in ViewModel

[acebytes]

💡 What: Added .lazy to scanResults and nodeModulesItems before calling chained array functions (.filter followed by .reduce).
🎯 Why: To optimize memory usage by avoiding intermediate array allocations. When chaining multiple array operations without .lazy, Swift will allocate and populate a completely new array between the calls just to hold the intermediate filtered elements. By applying .lazy, a LazySequence is created instead, and elements are yielded one-by-one as requested by .reduce. This is more efficient on both compute and memory overhead, especially when large numbers of caches/node_modules are found.
📊 Impact: Reduces memory overhead, eliminates unnecessary intermediate allocations, and results in slightly faster performance when recalculating total recoverable space and selected sizes.
🔬 Measurement: Validate array allocations by observing peak memory levels under high scale scenarios (e.g. hundreds of node_modules directories found), or by tracing allocations.

Added a learning entry in .jules/bolt.md documenting this finding.

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PR created automatically by Jules for task 5352020796557435002 started by @acebytes

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