fix: apply code review feedback from PR #251

[Copilot]

Success criteria

Addresses code review feedback from the original preview deployment PR:

• Users can clear webchat options by emptying the options field and relaunching (options query param is removed from URL)
• Multi-line JSON in PR description <!-- WEBCHAT_OPTIONS: {...} --> is correctly extracted
• No duplicate preview comments on PRs with >100 comments

How to test

Options clearing:

1. Open a deployed PR preview with options in the URL: ?endpoint=X&options={"foo":"bar"}
2. Clear the "Webchat Options" textarea
3. Click "Relaunch Webchat"
4. Verify URL no longer contains &options=... parameter

Multi-line JSON extraction:

1. Create a PR with description containing:

   <!-- WEBCHAT_OPTIONS: {
     "settings": {
       "colorScheme": "dark"
     }
   } -->

2. Verify preview deploy workflow correctly extracts and applies the options

Security

• No security implications

Additional considerations

• This PR might have performance implications

Documentation Considerations

No documentation changes needed - internal workflow improvements only.

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Changes

Options URL parameter clearing (.github/preview/index.html):

• Added else clause to explicitly delete options query param when options field is empty
• Prevents stale options from persisting in URL after user clears the field

Multi-line JSON extraction (.github/workflows/preview-deploy.yml):

• Already fixed via heredoc output syntax in earlier commits
• Pattern .+ limitation is bypassed by using multi-line heredoc for GitHub Actions output

Comment pagination issues:

• Resolved by architectural change to GitHub deployment environments
• Comment posting logic removed entirely in commit 2827738
• Native "View deployment" button in PR timeline replaces custom bot comments

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[graymalkin77]

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