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-bulk-code/bulk-code-form.html

@@ -2,4 +2,5 @@
    id set rides in hidden ids[] fields -- the analog of the edit modal's single db/id
    hidden -- so the selection survives form-changed / submit posts without an EDN snapshot
    or a filter round-trip. #}
-<form id="bulk-code-form"{{ form_attrs|safe }}>{{ ids_hidden|safe }}{{ modal|safe }}</form>
+<form id="bulk-code-form"{{ form_attrs|safe }}>{{ ids_hidden|safe }}{{ modal|safe }}
+</form>