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/email-templates/src/locales/en/account-delete-email.json

@@ -1,9 +1,9 @@
 {
-  "subject": "We have deleted your {{productName}} account",
-  "previewText": "We have deleted your {{productName}} account",
-  "hello": "Hello {{displayName}},",
-  "paragraph1": "This is to confirm that we have processed your request to delete your account with {{productName}}.",
+  "subject": "We have deleted your {productName} account",
+  "previewText": "We have deleted your {productName} account",
+  "hello": "Hello {displayName},",
+  "paragraph1": "This is to confirm that we have processed your request to delete your account with {productName}.",
   "paragraph2": "We're sorry to see you go. Please note that this action is irreversible, and we'll make sure to delete all of your data from our systems.",
-  "paragraph3": "We thank you again for using {{productName}}.",
-  "paragraph4": "The {{productName}} Team"
-}
+  "paragraph3": "We thank you again for using {productName}.",
+  "paragraph4": "The {productName} Team"
+}