refactor(ssr): full Selmer migration of Transaction Edit; remove the wizard

Squashed Phase-2 SSR work: migrate the Transaction Edit modal's render path
entirely to Selmer templates (zero Hiccup in the render path), rip out the
multi-step wizard abstraction (EditWizard/LinksStep records, MultiStepFormState,
step-params[...] field names, mm/* middleware) in favor of a plain form with
flat derived state, and promote shared UI components to reusable Selmer partials
under resources/templates/components/. Adds the Selmer interop bridge, the
auto-ap.ssr.components.selmer (sc) wrapper library, and the ssr-form-migration
skill capturing the learnings.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

test/clj/auto_ap/test_server.clj

@@ -100,6 +100,9 @@
                                  {:db/id "vendor-id"
                                   :vendor/name "Test Vendor"
                                   :vendor/default-account "account-id"}
+                                 {:db/id "vendor-id-2"
+                                  :vendor/name "Second Vendor"
+                                  :vendor/default-account "account-id-2"}
                                  (test-transaction :db/id "transaction-id"
                                                    :transaction/client "client-id"
                                                    :transaction/bank-account "bank-account-id"
@@ -166,7 +169,8 @@
              :second-account (get tempids "account-id-2")
              :fixed-location-account (get tempids "account-id-fixed-loc")
              :ap-account (get tempids "ap-account-id")
-             :vendor (get tempids "vendor-id")})
+             :vendor (get tempids "vendor-id")
+             :vendor2 (get tempids "vendor-id-2")})
     (reset! test-client-ids
             {:test (get tempids "client-id")
              :test2 (get tempids "client-id-2")})