Unify the dashboard experience and retire the multi-theme engine so onboarding and day-to-day invoicing feel consistent and easier to maintain.

Shared layout, tabs, and sidebar timer; user onboarding and registration polish; settings danger zone and data export; chart and tRPC perf fixes; migrations for onboarding and dropped appearance columns.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/lib/app-email.ts

@@ -0,0 +1,6 @@
+export const APP_EMAIL_DOMAIN = "beenvoice.app";
+
+export const PRIVACY_EMAIL = `privacy@${APP_EMAIL_DOMAIN}`;
+export const LEGAL_EMAIL = `legal@${APP_EMAIL_DOMAIN}`;
+export const SUPPORT_EMAIL = `support@${APP_EMAIL_DOMAIN}`;
+export const NOREPLY_EMAIL = `noreply@${APP_EMAIL_DOMAIN}`;