fix(results): restore nested if blocks in trace panel template

[sentry]

Fixes a TemplateSyntaxError: Invalid block tag on line 256: 'endif' that broke scenario result views (e.g. /runs/{run_id}/results/{result_id}/).

Root Cause

In commit 163f058, refactoring the target-trace section into a <details> element merged the outer {% if rep.trace %} and inner {% if rep.trace.spans %} checks into a single {% if rep.trace and rep.trace.spans %}. However, the inner block's {% else %} and {% endif %} were left in place alongside the outer {% endif %} and an extra closing </div>, leaving line 256's {% endif %} without a matching opening tag and causing Django's template compiler to fail immediately.

Changes

• Split the condition back into an outer {% if rep.trace %} around the <details> wrapper and an inner {% if rep.trace.spans %} inside <div class="mt-3">.
• Reconnected the existing {% else %} branch so the "target exported no spans" message can render as intended.
• Removed the redundant closing </div> and extra {% endif %}.
• Dropped the duplicate inline evidence-link expand script inside the trace block; the comprehensive version at the bottom of the partial already handles nested details expansion and hash changes.

Fixes SIMPLEAUDITSTUDIO-2Q

_{@sentry <feedback>: Autofix iterates on these changes
@sentry stop iterating: Autofix stops iterating on this run}