feat(frontend): Add worker ID to AppWorker class

[AntonioVentilii]

Motivation

We will use the workers as singleton. However, there is no way of connecting automatically each posted message to their correct listener, unless we completely rewrite the way we use workers.

Furthermore, not all workers will be singleton. And some of them will be only for iOS (to try and reduce the Jetsam issue).

An alternative solution is to provide each worker with an unique ID, and wrap the listener to such ID: in case the worker is a singleton, the listener will be triggered only for the correct worker ID.

In this PR, we add the worker ID, since it can be independent of the rest of the flow.

Changes

• Create worker ID on worker initialization.
• Send always the worker ID with the message.

Tests

Since we are here, we add tests.

[Copilot]

Pull Request Overview

This PR adds unique worker IDs to the AppWorker class to support singleton worker patterns and enable proper message routing between workers and their listeners. The worker ID is generated on initialization and automatically attached to all outgoing messages.

Key changes:

• Added WorkerId type and WithoutWorkerId<T> utility type for type safety
• Generated unique worker ID using crypto.randomUUID() on worker initialization
• Modified postMessage to automatically attach worker ID to all messages
• Added comprehensive test suite covering worker instantiation, messaging, and singleton behavior

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/frontend/src/lib/types/worker.ts	Added WorkerId type alias and WithoutWorkerId<T> utility type to prevent accidental worker ID collisions
src/frontend/src/lib/services/_worker.services.ts	Added worker ID field, generation logic, and automatic attachment to outgoing messages
src/frontend/src/tests/lib/services/worker.services.spec.ts	Added comprehensive test coverage for AppWorker functionality including worker ID attachment, singleton behavior, and message handling

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