feat(vercel): add pullNewEnvVars option and modal dismiss control

Add pullNewEnvVars to Vercel integration types, schema, defaults,
and parsing so integrations can opt into discovering new environment
variables from Vercel during builds.

- Add pullNewEnv boolean to VercelProjectIntegrationData and to the
  Vercel integration Zod schema (nullable/optional).
- Default pullNewEnvVars to true in createDefaultVercelIntegrationData
  and update defaults for atomicBuilds and pullEnvVarsBeforeBuild to
  include non-dev environments.
- Add helper isPullNewEnvVarsEnabled to coerce undefined/null to true.
- Parse pullNewEnvVars from route form input (string -> boolean|null).

Also improve GitHub connect modal handling:

- Add preventDismiss prop to the connect GitHub modal component.
- Prevent closing the modal via Escape key or clicking outside when
  preventDismiss is true by blocking onInteractOutside/onEscapeKeyDown
  and refusing to change open state when attempting to close.

These changes enable automatic discovery of new Vercel env vars by
default and provide a way to force modal persistence during critical
flows.

Author: 0ski

apps/webapp/app/routes/resources.orgs.$organizationSlug.projects.$projectParam.env.$envParam.github.tsx

@@ -330,12 +330,15 @@ export function ConnectGitHubRepoModal({
   projectSlug,
   environmentSlug,
   redirectUrl,
+  preventDismiss,
 }: {
   gitHubAppInstallations: GitHubAppInstallation[];
   organizationSlug: string;
   projectSlug: string;
   environmentSlug: string;
   redirectUrl?: string;
+  /** When true, prevents closing the modal via Escape key or clicking outside */
+  preventDismiss?: boolean;
 }) {
   const [isModalOpen, setIsModalOpen] = useState(false);
   const lastSubmission = useActionData() as any;
@@ -385,13 +388,34 @@ export function ConnectGitHubRepoModal({
   const actionUrl = gitHubResourcePath(organizationSlug, projectSlug, environmentSlug);
 
   return (
-    <Dialog open={isModalOpen} onOpenChange={setIsModalOpen}>
+    <Dialog
+      open={isModalOpen}
+      onOpenChange={(open) => {
+        // When preventDismiss is true, only allow opening, not closing
+        if (preventDismiss && !open) {
+          return;
+        }
+        setIsModalOpen(open);
+      }}
+    >
       <DialogTrigger asChild>
         <Button type="button" variant={"secondary/medium"} LeadingIcon={OctoKitty}>
           Connect GitHub repo
         </Button>
       </DialogTrigger>
-      <DialogContent>
+      <DialogContent
+        showCloseButton={!preventDismiss}
+        onInteractOutside={(e) => {
+          if (preventDismiss) {
+            e.preventDefault();
+          }
+        }}
+        onEscapeKeyDown={(e) => {
+          if (preventDismiss) {
+            e.preventDefault();
+          }
+        }}
+      >
         <DialogHeader>Connect GitHub repository</DialogHeader>
         <div className="mt-2 flex flex-col gap-4">
           <Form method="post" action={actionUrl} {...form.props} className="w-full">