Next.js Supabase V3 (#463)

Version 3 of the kit:
- Radix UI replaced with Base UI (using the Shadcn UI patterns)
- next-intl replaces react-i18next
- enhanceAction deprecated; usage moved to next-safe-action
- main layout now wrapped with [locale] path segment
- Teams only mode
- Layout updates
- Zod v4
- Next.js 16.2
- Typescript 6
- All other dependencies updated
- Removed deprecated Edge CSRF
- Dynamic Github Action runner

packages/i18n/src/navigation.ts

@@ -0,0 +1,10 @@
+import { createNavigation } from 'next-intl/navigation';
+
+import { routing } from './routing';
+
+/**
+ * Creates navigation utilities for next-intl.
+ * These utilities are locale-aware and automatically handle routing with locales.
+ */
+export const { Link, redirect, usePathname, useRouter, permanentRedirect } =
+  createNavigation(routing);