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

apps/web/app/[locale]/auth/callback/route.ts

@@ -0,0 +1,18 @@
+import { redirect } from 'next/navigation';
+import type { NextRequest } from 'next/server';
+
+import { createAuthCallbackService } from '@kit/supabase/auth';
+import { getSupabaseServerClient } from '@kit/supabase/server-client';
+
+import pathsConfig from '~/config/paths.config';
+
+export async function GET(request: NextRequest) {
+  const service = createAuthCallbackService(getSupabaseServerClient());
+
+  const { nextPath } = await service.exchangeCodeForSession(request, {
+    joinTeamPath: pathsConfig.app.joinTeam,
+    redirectPath: pathsConfig.app.home,
+  });
+
+  return redirect(nextPath);
+}