dashboard — barre de progression extraction par job

- dispatcher.py : ffmpeg lancé en background (setsid), polling du
  nombre de frames toutes les 5s → mise à jour du champ `progress`
  en DB. ffprobe estime le total avant lancement pour calculer le %.
- _jobs_table.html : barre de progression visible sur les jobs
  en status extracting/running
- style.css : styles .prog-wrap/.prog-fill/.prog-text

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

app/static/style.css

@@ -71,7 +71,10 @@ progress::-moz-progress-bar { background: var(--accent); }
 .job-list .job-item.error .icon { background: var(--err); color: #fff; font-weight: bold; }
 
 .job-list .label { color: var(--text); overflow: hidden; text-overflow: ellipsis;
-  white-space: nowrap; }
+  white-space: nowrap; display: flex; flex-direction: column; gap: 2px; }
+.prog-wrap { display: flex; align-items: center; gap: 4px; height: 10px; position: relative; width: 100%; max-width: 160px; }
+.prog-fill { display: block; height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.5s; min-width: 2px; }
+.prog-text { font-size: 0.7rem; color: var(--muted); white-space: nowrap; }
 .job-list .dur { color: var(--muted); font-size: 0.78rem; }
 .job-list .ext { margin-left: 0.5rem; color: var(--accent); font-size: 0.75rem; }
 button.ext.viewer-btn { background: transparent; border: 1px solid var(--accent);

app/templates/_jobs_table.html

@@ -19,6 +19,9 @@
           </span>
           <span class="label">
             {{ j.auv }}/{{ j.gopro_serial }}/{{ j.segment_label }}
+            {% if j.status in ('extracting','running') %}
+              <span class="prog-wrap"><span class="prog-fill" style="width:{{ j.progress }}%"></span><span class="prog-text">{{ j.progress }}%</span></span>
+            {% endif %}
             {% if j.status == 'done' and j.ply_path %}
               <button class="ext viewer-btn" data-view-url="jobs/{{ j.id }}/view">viser</button>
             {% endif %}