feat(ledger): add bookkeeping workbench and transaction views

- Add transactions_dirty table and zero-tolerance cleansing action

- Implement bookkeeping workbench (/bookkeeping) with searchable Combobox channel selector and card suffix / account identifier

- Implement transaction ledger (/transactions) with date groupings, multi-currency metrics, and filters

- Update AGENTS.md guidelines for Base UI Select and Combobox bindings

app/api/auth/[...nextauth]/route.ts

@@ -1,3 +1,3 @@
-import { handlers } from "@/lib/auth";
+import { handlers } from "@/lib/auth"
 
-export const { GET, POST } = handlers;
+export const { GET, POST } = handlers