Simplify the service worker's onfetch handler

[rthellend]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @rthellend, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request simplifies the asynchronous logic within the service worker's onfetch and onmessage handlers. By refactoring the promise-based flow, the code becomes more straightforward, directly assigning response resolution functions to appStreams entries, which are then immediately callable upon receiving messages. This change improves readability and maintains the same functionality with a cleaner implementation.

Highlights

• Simplified onfetch Handler: The service worker's onfetch event handler has been refactored to use a more direct and less nested Promise structure for responding to fetch requests, improving clarity and maintainability.
• Direct Function Assignment for appStreams: The appStreams[id] entry is now directly assigned a function that resolves the fetch response, rather than a Promise that resolves to a function, streamlining the asynchronous flow.
• Streamlined Message Handling: The self.onmessage handler has been updated to directly invoke the function stored in appStreams[id], aligning with the new pattern of direct function assignment.

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[gemini-code-assist]

Code Review

This pull request simplifies the onfetch handler in the service worker by removing nested promises. The change is a good improvement for readability. I've added one suggestion to further improve the onfetch handler by using async/await and adding a timeout to prevent potential memory leaks if the client page becomes unresponsive.