feat: implement background data refresh using Web Workers

[Buchi-Einstein]

Offloads non-critical data processing to a Web Worker to keep the main thread responsive.

• Worker (lib/workers/dataWorker.ts) handles: data sorting, search filtering, waveform computation
• Client API (lib/workerClient.ts) with Promise-based message passing
• Automatic fallback to main thread execution when Worker API unavailable
• Worker terminated after 30s idle timeout
• Error handling propagated from worker to caller via rejected promises
• next.config.ts configured for proper worker asset output
• Workers loaded via standard webpack 5 new URL pattern for static asset bundling

Closes #111

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