fix(embed): redirect URL after submit + themed success message

[devCluna]

Summary

Two embed fixes for the submit flow.

• Redirect after submit — the redirectUrl form setting was dead (never read by the embed). On submit, the form now navigates to it (window.location.href) when set; otherwise it shows the success message.
• Themed success message — the success <p> was appended after the themed <form> was cleared, so it lost the theme. It's now wrapped in .sfb-form with the resolved --sfb-* variables re-applied, keeping fonts/colors on-theme (matters on third-party embeds where there's no page card to inherit from). Small padding tweak on .sfb-success.

Verification

End-to-end via a cross-origin embed page (localhost:8080 → Strapi on :1338): auto-fills, submits, and the page navigates to the configured redirect URL. Type-check (server + admin), 31/31 tests, build all pass. No dependency changes.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Forms can now redirect visitors to a configured URL after successful submission.
  • Success messages now preserve the form’s theme styling when displayed inline.

• Style

  • Improved success message spacing and readability.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 85090982-5fb3-4ac9-a747-e87ee1316d34

📥 Commits

Reviewing files that changed from the base of the PR and between 1a91916 and 2bff257.

📒 Files selected for processing (1)

• server/src/controllers/form.ts

📝 Walkthrough

Walkthrough

Changes

Form success flow

Layer / File(s)	Summary
Success handling and presentation server/src/controllers/form.ts, admin/src/form-css.ts	Post-submit handling redirects when configured or renders a themed .sfb-form success wrapper, while .sfb-success receives updated sizing and spacing styles.

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

Poem

I’m a bunny hopping through the form,
With redirects ready to perform.
Success gets styled, wrapped, and bright,
Then hops along to its next delight.
Thump-thump—submitted just right!

🚥 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 clearly matches the main changes: post-submit redirect behavior and the themed success message.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/redirect-and-success-theme

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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 `@server/src/controllers/form.ts`:
- Around line 228-244: Validate form.settings.redirectUrl before assigning it in
the submit-success logic: allow only relative URLs or http/https URLs, and
reject javascript: or other schemes. When invalid, restore the submit button’s
enabled state before continuing to the success-message path; only assign
window.location.href for validated redirects.

🪄 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

Run ID: 5deedfaa-2f4f-4297-a812-331ed1c4b164

📥 Commits

Reviewing files that changed from the base of the PR and between 9d3c2d9 and 1a91916.

📒 Files selected for processing (2)

• admin/src/form-css.ts
• server/src/controllers/form.ts