fix: Removed deprecated sugar-web library causing maintenance overhead

[Anshumancanrock]

What does this PR do?

This PR removes all remaining references to the deprecated sugar-web library from the Music Blocks codebase. It deletes the outdated lib/sugar-web/ directory, cleans up related entries in the service worker, and removes obsolete comments. The change fully eliminates sugar-web while preserving application functionality and ensuring no breaking changes.

Fixes #4680

After Fix (Video):

Recording.2025-09-18.002441.mp4

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[Anshumancanrock]

@omsuneri Hi Sir, Kindly review my PR and let me know if you want any changes. Thank you!

[omsuneri]

@omsuneri Hi Sir, Kindly review my PR and let me know if you want any changes. Thank you!

I ll test this and will let you know !!

[omsuneri]

@Anshumancanrock please change your commit message to follow our contributors guideline
"done" and "fix" seems very unprofessional commit messages cause over the time we only have commit messages with us to track the code !!
check this out https://github.com/sugarlabs/sugar-docs/blob/master/src/contributing.md

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[Anshumancanrock]

@omsuneri Thanks for the suggestion ! have fixed the commit message and i will take care of this from now onwards.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.

[github-actions]

✅ All Jest tests passed! This PR is ready to merge.