Add 'Compute now' button to job detail File & Geometry card

POST /jobs/{id}/analyse clears the stl_cache entry and re-runs trimesh,
then redirects back to the detail page. Button hidden for .gcode files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/templates/job_detail.html

@@ -70,8 +70,15 @@
   {# ── STL geometry ── #}
   <div class="col-md-6">
     <div class="card h-100">
-      <div class="card-header text-secondary small text-uppercase fw-normal" style="border-color:#21262d">
-        File &amp; Geometry
+      <div class="card-header border-secondary d-flex align-items-center justify-content-between" style="border-color:#21262d">
+        <span class="text-secondary small text-uppercase fw-normal">File &amp; Geometry</span>
+        {% if job.file_name and not job.file_name.endswith('.gcode') %}
+        <form method="POST" action="/jobs/{{ job.id }}/analyse">
+          <button type="submit" class="btn btn-outline-secondary btn-sm py-0 px-2" style="font-size:.75rem">
+            <i class="bi bi-cpu me-1"></i>Compute now
+          </button>
+        </form>
+        {% endif %}
       </div>
       <div class="card-body">
         {% if job.file_name %}
@@ -91,7 +98,7 @@
         {% elif job.file_name and job.file_name.endswith('.gcode') %}
         <p class="text-secondary small mb-0">Geometry not available for gcode files.</p>
         {% elif job.file_name %}
-        <p class="text-secondary small mb-0">Not yet analysed — will be computed on next upload.</p>
+        <p class="text-secondary small mb-0">Not yet analysed.</p>
         {% else %}
         <p class="text-secondary small mb-0">No file attached.</p>
         {% endif %}