Typed message protocol between UI and worker

[Aditya8369]

I have successfully completed implementing the Typed Message Protocol between the UI hook and the background Web Worker.

Summary of Changes
types/worker.ts (NEW):

Defined strict interfaces for WorkerRequest ({ type, requestId, payload }) and WorkerResponse ({ requestId, success, payload, timings }).
lib/hooks/useCipherWorker.ts:

Refactored the hook to compile and JSON-serialize the strictly structured request payload.
Refactored onmessage handling to validate and process responses conforming to WorkerResponse.
lib/workers/cipher.worker.ts:

Refactored parameters destructuring directly out of the typed payload request object.
Enforced total job execution timing tracking using performance.now().
Sent strictly structured response messages containing calculation results/errors and timings.
tests/unit/hooks/useCipherWorker.test.ts:

Refactored the unit test suite to fully type-check requests and responses. All unit tests successfully compiled and passed.

closes #82

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[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[csxark]

Great work @Aditya8369, and thank you for your contribution! 🎉I've reviewed the changes, and everything looks good. The requested fixes have been addressed correctly, and the implementation aligns well with the requirements. This is ready to be merged. Looking forward to your future contributions!