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/components/svg-x.html

@@ -1 +1,3 @@
-<svg viewbox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><defs></defs><title>delete-2</title><circle cx="12" cy="12" fill="none" r="11.5" stroke-linecap="round" stroke-linejoin="round" stroke="currentColor"></circle><line fill="none" stroke-linecap="round" stroke-linejoin="round" stroke="currentColor" x1="7" x2="17" y1="7" y2="17"></line><line fill="none" stroke-linecap="round" stroke-linejoin="round" stroke="currentColor" x1="17" x2="7" y1="7" y2="17"></line></svg>
+<svg viewbox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+  <defs></defs><title>delete-2</title><circle cx="12" cy="12" fill="none" r="11.5" stroke-linecap="round" stroke-linejoin="round" stroke="currentColor"></circle><line fill="none" stroke-linecap="round" stroke-linejoin="round" stroke="currentColor" x1="7" x2="17" y1="7" y2="17"></line><line fill="none" stroke-linecap="round" stroke-linejoin="round" stroke="currentColor" x1="17" x2="7" y1="7" y2="17"></line>
+</svg>