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/ssr/selmer_test.clj

@@ -0,0 +1,36 @@
+(ns auto-ap.ssr.selmer-test
+  (:require
+   [auto-ap.ssr.selmer :as sut]
+   [clojure.string :as str]
+   [clojure.test :refer [deftest is testing]]
+   [hiccup2.core :as h2]))
+
+(deftest hiccup->html
+  (testing "renders a Hiccup form to an HTML string"
+    (is (= "<span class=\"label\">A &amp; B</span>"
+           (sut/hiccup->html [:span.label "A & B"])))))
+
+(deftest selmer-embeds-hiccup
+  (testing "a Hiccup component renders inside a Selmer template via |safe"
+    (let [frag (sut/hiccup->html [:span.badge "from hiccup"])
+          out  (sut/render-str "<div>{{frag|safe}}</div>" {:frag frag})]
+      (is (str/includes? out "<span class=\"badge\">from hiccup</span>"))
+      ;; without |safe the markup would be escaped; |safe keeps it verbatim
+      (is (not (str/includes? out "&lt;span"))))))
+
+(deftest selmer-fragment-inside-hiccup
+  (testing "a Selmer fragment renders inside a Hiccup tree without double-escaping"
+    (let [sel (sut/render-str "<a href=\"{{url}}\">{{label}}</a>" {:url "/x" :label "Go"})
+          out (str (h2/html {} [:div (sut/raw sel)]))]
+      (is (= "<div><a href=\"/x\">Go</a></div>" out)))))
+
+(deftest render-file-from-classpath
+  (testing "render-file resolves a template under resources/templates and keeps plain-HTML Alpine/HTMX attrs"
+    (let [out (sut/render "templates/interop-smoke.html"
+                          {:title "Interop OK"
+                           :hiccup_frag (sut/hiccup->html [:span.badge "from hiccup"])})]
+      (is (str/includes? out "Interop OK"))
+      (is (str/includes? out "from hiccup"))
+      ;; plain-HTML attributes (the whole point of Selmer) survive unambiguously
+      (is (str/includes? out "x-model=\"value.value\""))
+      (is (str/includes? out "tippy?.show()")))))