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>

resources/templates/components/location-select.html

@@ -0,0 +1,8 @@
+{# Location <select> for a transaction account row. Plain-HTML attributes -- the Selmer
+   migration target (no Hiccup keyword/string attribute ambiguity). Rendered into the
+   surrounding Hiccup row via the auto-ap.ssr.selmer interop bridge. #}
+<select name="{{ name }}" class="{{ classes }}">
+  {% for opt in options %}
+  <option value="{{ opt.value }}"{% if opt.selected %} selected{% endif %}>{{ opt.label }}</option>
+  {% endfor %}
+</select>