C3: replace Svelte's pages:dev with pages:preview and add optional previewScript to the c3 summary

[dario-piotrowicz]

Fixes #4799

[changeset-bot]

🦋 Changeset detected

Latest commit: 307ad11

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
create-cloudflare	Minor

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7685979099/npm-package-wrangler-4850

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/4850/npm-package-wrangler-4850

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7685979099/npm-package-wrangler-4850 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7685979099/npm-package-create-cloudflare-4850 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7685979099/npm-package-miniflare-4850

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7685979099/npm-package-cloudflare-pages-shared-4850

Note that these links will no longer work once the GitHub Actions artifact expires.

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20231218.4
workerd	1.20231218.0	1.20231218.0
workerd --version	1.20231218.0	2023-12-18

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (75f99d7) 70.70% compared to head (307ad11) 70.72%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4850      +/-   ##
==========================================
+ Coverage   70.70%   70.72%   +0.01%     
==========================================
  Files         291      291              
  Lines       15164    15164              
  Branches     3859     3859              
==========================================
+ Hits        10721    10724       +3     
+ Misses       4443     4440       -3     

see 5 files with indirect coverage changes