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

Migrate every part of the Transaction Edit modal's HTML to Selmer templates
(zero Hiccup in the render path) and delete the mm multi-modal "wizard"
abstraction entirely -- there was only ever one step.

- New auto-ap.ssr.components.selmer (sc) + ~22 shared component partials under
  resources/templates/components/ (typeahead, button-group, radio-card,
  data-grid, validated-field, modal, buttons, inputs, SVGs). Each wrapper renders
  its own partial; dynamic HTMX/Alpine attrs bridge via attrs->str -> {{attrs|safe}}.
- 15 modal templates under resources/templates/transaction-edit/.
- Delete EditWizard/LinksStep records + all mm/* usage. Plain handlers: flat
  wrap-decode-edit (fields renamed off step-params[...], stray keys stripped),
  flat wrap-derive-state, *errors*-based field errors, generic wrap-form-4xx-2.
- Drop the edit-wizard-navigate route (routes ~12 -> 5).
- Fix: stray `method` (tab button-group hidden) leaked into the upsert -> 500;
  strip decoded map to schema keys.
- e2e selectors updated (#wizard-form->#edit-form, #wizardmodal->#editmodal,
  step-params[...] field names). Parity: swap 6/6, edit 8/8, suite 38/1
  (1 pre-existing unrelated nav test).
- ssr-form-migration skill updated with the learnings (composition mechanics,
  sc/* library, drop-the-wizard recipe, scorecard row, 3 new gotchas).

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

.claude/skills/ssr-form-migration/reference/selmer-conventions.md

@@ -75,11 +75,60 @@ Lessons:
 - **Embed via the bridge.** `render->hiccup` lets the Selmer fragment sit inside the
   still-Hiccup row (`com/validated-field` wraps it) — strangler, one component at a time.
 
-## Composition
+## Composition — verified mechanics (selmer 1.12.61)
 
-Selmer composes via `{% include %}` and `{% block %}`. Prefer small per-component templates
-referenced by classpath path. Keep `|safe` to values the server fully controls (rendered
-Hiccup, JSON for `x-data`), never raw user input.
+Proven by REPL before the full migration (do the same before relying on any of these):
+
+- **`{% include %}` works in FILE renders only.** `sel/render` = `selmer/render-file`, and
+  include/extends/block are *parse-stage* tags. Rendering a template **string** that
+  contains `{% include %}` throws `unrecognized tag: :include` (the runtime expr-tag has a
+  nil handler). So includes only work from a `.html` file, never from `render-str`.
+- **`{% include %}` sees `{% for %}` loop bindings.** Inside `{% for row in rows %}…{% include "components/x.html" %}…{% endfor %}` the partial can read `row.*`. Good for repeated
+  rows — though Clojure-composing the rows (below) is usually simpler.
+- **`{% include … with k=v %}` is IGNORED** in 1.12.61 (the `with` clause is dropped). To
+  parametrize, either wrap with the block tag `{% with k=v %}{% include … %}{% endwith %}`
+  (works), or — preferred — let a Clojure wrapper render the partial with an explicit ctx.
+
+## The Clojure-wrapper composition pattern (`auto-ap.ssr.components.selmer` / `sc`)
+
+Because `{% include with %}` can't pass args and the server computes most values anyway,
+each shared component is a **thin Clojure wrapper that renders its own partial** (the
+proven `location-select*` shape, generalised). The element *structure* lives 100% in the
+`.html`; the only Clojure is data assembly. The modal's render fns compose these wrappers
+and assemble a view-model, interpolating the pre-rendered fragments as `{{ frag|safe }}`.
+
+```clojure
+(sc/hidden {:name … :value …})            ; -> render "components/hidden.html"
+(sc/validated-field {:label … :errors …} body…)
+(sc/typeahead {:name … :url … :value … :content-fn …})   ; resolves label server-side
+(sc/data-grid {:headers […] :footer-tbody …} rows…)
+```
+
+### `attrs->str` — the dynamic-attribute bridge
+
+HTMX/Alpine attributes vary per call site, so a fixed template can't enumerate them.
+`sc/attrs->str` serialises an attribute *map* to an HTML attribute *string* injected with
+`{{ attrs|safe }}`: `<input type="hidden"{{ attrs|safe }}>`. Rules mirror hiccup2 — nil/false
+dropped, `true` → bare boolean attr, else `name="escaped"` (via `hu/escape-html`, so JSON
+`x-data` and `x-init` quotes become `&quot;`/`&apos;` and the browser decodes them back).
+Keyword keys keep their full name incl. namespaced/colon forms (`:x-hx-val:account-id` →
+`x-hx-val:account-id`). This keeps templates free of per-attribute `{% if %}` ladders while
+still emitting 100% Selmer markup — `attrs->str` serialises data, it does not build Hiccup.
+
+### Reuse the real class helpers
+
+Wrappers reuse `inputs/default-input-classes`, `inputs/use-size`, `hh/add-class`,
+`btn/bg-colors` so output matches the Hiccup component **modulo Tailwind class order**.
+Verify by class-**set** equality + e2e, never byte-parity (see the cookbook entries).
+
+### Trivial wrapper divs
+
+A bare `<div class="w-72">…</div>` around a fragment is composed with a `wrap-div` string
+helper (or put the class in the parent template), not a Hiccup vector — string composition
+of a structural wrapper is not Hiccup and avoids a micro-template per div.
+
+Keep `|safe` to values the server fully controls (rendered fragments, JSON for `x-data`),
+never raw user input.
 
 ## Scope (Open decision 2)