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

test/clj/auto_ap/ssr/ledger_test.clj

@@ -411,7 +411,7 @@
                                 :location "HQ"}]}
           admin-identity (admin-token)]
       (is (thrown? Exception (sut/import-ledger {:form-params form-params
-                                                  :identity admin-identity})))))
+                                                 :identity admin-identity})))))
 
   (testing "Should produce form-errors for invalid account entries"
     (let [_ (setup-test-data [(test-client :db/id "err-client-1"
@@ -430,7 +430,7 @@
                                 :location "HQ"}]}
           admin-identity (admin-token)]
       (is (thrown? Exception (sut/import-ledger {:form-params form-params
-                                                  :identity admin-identity}))))))
+                                                 :identity admin-identity}))))))
 
 (deftest import-ledger-with-warnings-test
   (testing "Should ignore entries with only warnings"