⚡ Bolt: Offload blocking I/O to background tasks

[acebytes]

💡 What: Offloaded synchronous blocking operations (DiskInfo.current(), Process.run(), process.waitUntilExit(), and readDataToEndOfFile()) from the @MainActor to a detached background task using Task.detached { ... }.value.
🎯 Why: Running synchronous filesystem reads and process executions within an @MainActor function causes the main thread to block, leading to UI freezes (spinning beachball) while scanning or pruning Docker.
📊 Impact: Prevents UI unresponsiveness during Docker prune and disk space calculations. Scanning and pruning will no longer block the main thread.
🔬 Measurement: Trigger a Docker prune via the UI or run a normal scan; the application should remain responsive (animations run, buttons clickable) while the operation completes.

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PR created automatically by Jules for task 873444635962137159 started by @acebytes

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