Add vendor pre-population for bulk code and individual edit forms

- Add vendor-changed HTMX handlers for both bulk code and individual edit
- Pre-populate default account at 100% when vendor is selected and no accounts exist
- Fix render-accounts-section to render from step-params correctly
- Change bulk code vendor-changed from hx-get to hx-post to include form data
- Add routes for vendor-changed endpoints
- Update e2e tests to cover vendor pre-population
- Run lein cljfmt fix across codebase

src/clj/auto_ap/jobs/close_auto_invoices.clj

@@ -20,8 +20,7 @@
 
                                 (mapv (fn [[i]] {:db/id                       i
                                                  :invoice/outstanding-balance 0.0
-                                                 :invoice/status              :invoice-status/paid}))
-                                ))
+                                                 :invoice/status              :invoice-status/paid}))))
 
     (alog/info ::closed :count (count invoices-to-close))))