Quality scan v4: calibrated PIL verdicts (dark/blurry, 300px downscale, threshold 200); persist status+flag_reason; lazy thumbnails (11.5s→0.08s page load)

dashboard/templates/_card.html

@@ -15,6 +15,7 @@
     <span class="badge {{ item["status"] }}">{{ item["status"] }}</span>
     <span style="color:#666"> · {{ item["source"] }}</span>
     {% if item["size_mb"] %}<span style="color:#666"> · {{ item["size_mb"] }}MB</span>{% endif %}
+    {% if item.get("flag_reason") %}<span style="color:#d43"> · ⚠ {{ item["flag_reason"] }}</span>{% endif %}
   </div>
   <div class="actions">
     <button class="approve" hx-post="/review/{{ item["sha256"] }}/approve" hx-target="#card-{{ sha8 }}" hx-swap="outerHTML" hx-on::after-request="if(event.detail.successful){this.closest('.card').remove();updateCount();showToast('Approved');}">✅ Keep</button>