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/components/forms/email-preview.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { generateInvoiceEmailTemplate } from "~/lib/email-templates";
+import { getAppUrl } from "~/lib/app-url";
 
 interface EmailPreviewProps {
   subject: string;
@@ -89,10 +90,7 @@ export function EmailPreview({
         customMessage: customMessage,
         userName: invoice.business?.name ?? "Your Business",
         userEmail: fromEmail,
-        baseUrl:
-          typeof window !== "undefined"
-            ? window.location.origin
-            : "https://beenvoice.app",
+        baseUrl: getAppUrl(),
       })
     : null;