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>

drizzle/meta/_journal.json

@@ -120,6 +120,20 @@
       "when": 1781500000000,
       "tag": "0016_fix_send_reminder_at_column",
       "breakpoints": true
+    },
+    {
+      "idx": 17,
+      "version": "7",
+      "when": 1781600000000,
+      "tag": "0017_drop_theme_engine_columns",
+      "breakpoints": true
+    },
+    {
+      "idx": 18,
+      "version": "7",
+      "when": 1781700000000,
+      "tag": "0018_user_onboarding",
+      "breakpoints": true
     }
   ]
 }