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-url.ts

@@ -0,0 +1,20 @@
+/** Public app origin (no trailing slash). */
+export function getAppUrl(): string {
+  if (typeof window !== "undefined") {
+    return window.location.origin.replace(/\/$/, "");
+  }
+
+  const fromEnv = process.env.NEXT_PUBLIC_APP_URL?.trim();
+  if (fromEnv) return fromEnv.replace(/\/$/, "");
+
+  return `http://localhost:${process.env.PORT ?? 3000}`;
+}
+
+/** Hostname for display (e.g. marketing browser chrome). */
+export function getAppHost(): string {
+  try {
+    return new URL(getAppUrl()).host;
+  } catch {
+    return "beenvoice.app";
+  }
+}