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/manual-coding.html

@@ -1,3 +1,11 @@
 {# Vendor field (a change repopulates the default account via a whole-form swap) + either
    the simple single-row coding or the advanced account grid. #}
-<div id="manual-coding-section">{{ mode_hidden|safe }}<div{{ vendor_changed_attrs|safe }}>{{ vendor_field|safe }}</div>{% if is_simple %}<div x-data="{{ simple_xdata }}">{{ simple_mode|safe }}</div>{% else %}<div>{{ toggle_link|safe }}{{ accounts_field|safe }}</div>{% endif %}</div>
+<div id="manual-coding-section">
+  {{ mode_hidden|safe }}<div {{ vendor_changed_attrs|safe }}>{{ vendor_field|safe }}
+</div>
+{% if is_simple %}
+  <div x-data="{{ simple_xdata }}">{{ simple_mode|safe }}</div>
+{% else %}
+  <div>{{ toggle_link|safe }}{{ accounts_field|safe }}</div>
+{% endif %}
+</div>