Fix stepper checkmarks, error recovery, radio button spacing

- Both steppers now show green checkmark on final step when completed
  instead of leaving it highlighted as 'current' (blue)
- Stems error is cleared at the start of every generate_stems attempt,
  not just on success — no stale error messages after retry
- Radio buttons in stems section use same compact spacing as checkboxes

app.py

@@ -1214,6 +1214,7 @@ def admin_request(rid):
 
         elif action == 'generate_stems':
             # Queue a stem extraction job for the selected MP3 (Version A or B).
+            # Clear any previous error at the start of every attempt.
             api_key = get_musicgpt_api_key()
             if not api_key:
                 flash('MusicGPT API key is not configured.', 'error')
@@ -1221,6 +1222,8 @@ def admin_request(rid):
             if req.get('stems_status') in ('IN_QUEUE', 'IN_PROGRESS'):
                 flash('A stems extraction is already in progress.', 'error')
                 return redirect(url_for('admin_request', rid=rid))
+            # Clear prior error so the operator doesn't see a stale message after retry.
+            update_request(rid, stems_error=None)
             # Operator selects which version (A or B) to extract stems from.
             selected = request.form.get('stems_source', '').strip()
             if selected == 'a':

templates/admin/request.html

@@ -111,7 +111,8 @@
       margin:.6rem 0;
       padding:.4rem 0;
     }
-    .song-row input[type="checkbox"]{
+    .song-row input[type="checkbox"],
+    .song-row input[type="radio"]{
       width:auto;
       margin:.2rem 0 0 0;
       flex-shrink:0;
@@ -256,8 +257,9 @@
           <ol class="steps" aria-label="Request progress">
             {% for i in range(steps|length) %}
             {% set key, label = steps[i] %}
-            {% set is_completed = i < current_step %}
+            {% set is_last = i == steps|length - 1 %}
-            {% set is_current = i == current_step %}
+            {% set is_completed = i < current_step or (is_last and current_step == i) %}
+            {% set is_current = i == current_step and not is_last %}
             <li class="step-item {% if is_completed %}completed{% elif is_current %}current{% else %}upcoming{% endif %}" {% if is_current %}aria-current="step"{% endif %}>
               <div class="step-indicator">
                 {% if is_completed %}✓{% else %}{{ i + 1 }}{% endif %}
@@ -282,10 +284,11 @@
               {% if mg_steps[j][0] == current_mg %}{% set ns.mg_index = j %}{% endif %}
             {% endfor %}
             {% if current_mg in ('FAILED', 'ERROR', 'CANCELLED') %}{% set ns.mg_index = -2 %}{% endif %}
+            {% set mg_completed_step = req.musicgpt_status in ('COMPLETED', 'FINISHED') %}
             {% for j in range(mg_steps|length) %}
               {% set mg_key, mg_label = mg_steps[j] %}
-              {% set mg_completed = j < ns.mg_index %}
+              {% set mg_completed = j < ns.mg_index or mg_completed_step %}
-              {% set mg_current = j == ns.mg_index %}
+              {% set mg_current = j == ns.mg_index and not mg_completed_step %}
               <li class="step-item {% if mg_completed %}completed{% elif mg_current %}current{% else %}upcoming{% endif %} {% if ns.mg_index == -2 and not mg_completed and not mg_current %}upcoming{% endif %}" {% if mg_current %}aria-current="step"{% endif %}>
                 <div class="step-indicator">
                   {% if mg_completed %}✓{% else %}{{ j + 1 }}{% endif %}