chore(build): add Vercel preview builds for framework test apps

[ShaneK]

Issue number: resolves internal

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What is the current behavior?

Vercel preview deployments only build and serve core Stencil component test pages. Framework-specific test apps (Angular, React, Vue, React Router) are not included, requiring developers to pull and build locally to validate them.

What is the new behavior?

Vercel preview deployments build and serve framework test apps alongside core component tests under a single preview URL.

Does this introduce a breaking change?

• Yes
• No

Other information

[vercel]

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Project	Deployment	Actions	Updated (UTC)
ionic-framework	Ready	Preview, Comment	Apr 14, 2026 5:17pm

[thetaPC]

Mainly requesting for the sync command.

Question: Is it possible to add a way where we can determine if we want to build the frameworks? That way if we only need core then we don't have to wait for the others to build. It can be a label that is added to the PR or text command that is submitted through the comments, etc.

[ShaneK]

RE: Your review comment:

Not really, unfortunately. If we relied on code-based suggestion, we'd be building most of the time anyway (we need to build them all any time core changes). If we went the tag route, we'd have to make some annoying changes to Vercel, including giving it a GitHub token to read that I think. I'm pretty sure what it currently has access to isn't enough to pull labels like that.

[thetaPC]

LGTM, thank you so much!!