Add Progress throttling

[tapava]

Add optional progressThrottle option to prevent state flooding when compute functions fire progress updates in tight loops. Should throttle/debounce progress callbacks to avoid choking the main thread with re-renders.

• Add progressThrottle?: number option (ms) to ComputeOptions
• Throttle onProgress calls in the React hook
• Consider both throttle (regular intervals) and debounce (wait for pause) strategies