fix: Modify preview url

[xuanlid]

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PR

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our Commit Message Guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• Built its own designer, fully self-validated

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Background and solution

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

Summary by CodeRabbit

• Bug Fixes
  • Improved preview URL handling across production and alpha environments.
  • Added support for explicitly configured preview URLs.
  • Ensured preview links remain blank when no applicable URL is available.

[coderabbitai]

Walkthrough

Preview URL resolution was extracted into module-level constants in both designer registries. An explicit VITE_PREVIEW_URL now takes precedence, with production and alpha mode fallbacks retained before assigning the result to the Preview configuration.

Changes

Preview URL configuration

Layer / File(s)	Summary
Resolve and wire preview URLs designer-demo/registry.js, packages/engine-cli/template/designer/registry.js	Both registries prioritize VITE_PREVIEW_URL, otherwise derive /preview.html for production or alpha modes and use an empty value elsewhere. The Preview configuration references the computed constant.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: bug

Poem

I’m a rabbit with a preview to show,
An explicit URL leads the flow.
In alpha or production, pages appear,
Other modes keep the path clear.
Hop, hop—configuration is neat!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: updating preview URL behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Warning

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@designer-demo/registry.js`:
- Around line 21-22: Update the preview-mode gate in the registry configuration
to include `prod` alongside `production` and `alpha`, ensuring the
VITE_PREVIEW_URL fallback is enabled when running the documented production
build mode.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0963a1e3-ad4c-4059-9501-5ac6e305ade6

📥 Commits

Reviewing files that changed from the base of the PR and between 484898f and a8a87e3.

📒 Files selected for processing (2)

• designer-demo/registry.js
• packages/engine-cli/template/designer/registry.js