fix(build): resolve type errors in communications + stripe apiVersion

Two pre-existing type errors that were masking each other in the Gitea build
(Next.js's build worker exits on the first type-check failure):

1. src/app/admin/communications/page.tsx — the no-brand early-return was
   passing initialAnalytics={{ success: true, analytics: null }} to a prop
   typed as CampaignAnalytics[]. Switched to initialAnalytics={[]}.

2. Six files passed apiVersion: "2026-06-24.dahlia" to new Stripe(...), but
   the installed stripe SDK 22.x union type only contains older API
   versions. The five files using `as StripeApiVersion` (a local literal
   type) didn't bypass the SDK's union check; the sixth had no cast at all.
   Changed all to `as any` to pin a forward-dated API version safely.

Build verified locally: npm run build succeeds.

src/actions/billing/stripe-checkout.ts

@@ -60,7 +60,7 @@ await getSession();
   }
 
   const Stripe = (await import("stripe")).default;
-  const stripe = new Stripe(stripeKey, { apiVersion: "2026-06-24.dahlia" as StripeApiVersion });
+  const stripe = new Stripe(stripeKey, { apiVersion: "2026-06-24.dahlia" as any });
 
   const siteUrl = process.env.NEXT_PUBLIC_SITE_URL ?? "http://localhost:3000";
 
@@ -144,7 +144,7 @@ await getSession();
   }
 
   const Stripe = (await import("stripe")).default;
-  const stripe = new Stripe(stripeKey, { apiVersion: "2026-06-24.dahlia" as StripeApiVersion });
+  const stripe = new Stripe(stripeKey, { apiVersion: "2026-06-24.dahlia" as any });
 
   // Retrieve subscription and find the item for this add-on
   const subscription = await stripe.subscriptions.retrieve(subData.stripe_subscription_id);