Run spxls in Web Worker

[nighca]

close #1187.

[qiniu-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Files not reviewed (1)

• spx-gui/tsconfig.app.json: Language not supported

Comments suppressed due to low confidence (1)

tools/spxls/client.ts:8

• The error message 'unknown message type' is unclear. It should be updated to 'Unknown message type received in handleMessage'.

throw new Error('unknown message type')

[qiniu-ci]

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