feat: Specify max possible options to select in Form multiselect input

[michael-radency]

Summary

Specify max possible options to select in Form multiselect input
When max is equal 1 field will behave as radiobuttons allowing only single selection

Related Linear tickets, Github issues, and Community forum posts

Review / Merge checklist

• PR title and summary are descriptive. (conventions)
• Docs updated or follow-up ticket created.
• Tests included.
• PR Labeled with release/backport (if the PR is an urgent fix that needs to be backported)

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Your Name seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[cubic-dev-ai]

cubic analysis

1 issue found across 4 files • Review in cubic

_{React with 👍 or 👎 to teach cubic. You can also tag @cubic-dev-ai to give feedback, ask questions, or re-run the review.}

[cubic-dev-ai]

parseInt result is not validated – NaN disables the limit silently, allowing unlimited selections

Prompt for AI agents

Address the following comment on packages/cli/templates/form-trigger.handlebars at line 679:

<comment>parseInt result is not validated – `NaN` disables the limit silently, allowing unlimited selections</comment>

<file context>
@@ -676,8 +676,14 @@
 
 			function validateMultiselect(input, errorElement) {
 				const selectedValues = getSelectedValues(input);
+				const maxSelectAllowed = input.dataset.maxSelectAllowed ? parseInt(input.dataset.maxSelectAllowed, 10) : null;
 
 				if (!selectedValues.length) {
</file context>