style(templates): format Selmer .html templates for readability

Many templates were minified onto a single line. Reformatted every template under
resources/templates/ with djLint (django profile, 2-space indent) so the markup,
{% %} blocks, and {{ }} interpolations are human-readable, plus hand-split the two
multi-<span> option partials (invoice-option / rule-option). Pure reflow — no markup,
tag, or text content changed (the only content-adjacent delta is harmless trailing
whitespace inside single-interpolation elements). link.html / panel-empty.html stay on
one line (single element). resources/public/index.html left as-is (already readable,
non-template static).

Full e2e suite 72/72 green (no rendering regressions).

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

resources/templates/transaction-edit/panel-list.html

@@ -1,3 +1,10 @@
 {# Shared shell for the autopay/unpaid/rule match panels: heading + action hidden +
    prompt label + a radio-card of options. #}
-<div><h3 class="text-lg font-bold mb-4">{{ heading }}</h3>{{ action_hidden|safe }}<div class="space-y-2"><label class="block text-sm font-medium mb-1">{{ prompt }}</label>{{ radio|safe }}</div></div>
+<div>
+  <h3 class="text-lg font-bold mb-4">{{ heading }}</h3>
+  {{ action_hidden|safe }}
+  <div class="space-y-2">
+    <label class="block text-sm font-medium mb-1">{{ prompt }}</label>
+    {{ radio|safe }}
+  </div>
+</div>