feat(mail): center-align action button in email template

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/app/env.d.ts

@@ -1,4 +1,15 @@
 import 'vue-router'
+
+interface ImportMetaEnv {
+  readonly VITE_API_URL: string
+  readonly VITE_APP_NAME: string
+  readonly VITE_PORTAL_URL: string
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}
+
 declare module 'vue-router' {
   interface RouteMeta {
     action?: string