fix: PDF extraction bbox compatibility, update date formats, and bump max retries

- Fix bbox format detection in pdf_image_extractor (support Rect and tuple)
- Update date display format to include year (%Y-%m-%d) across templates
- Increase SUMMARY_MAX_RETRIES from 1 to 2 for better error recovery
- Widen date input field for better usability

app/templates/detail.html

@@ -23,7 +23,7 @@ endblock %} {% block content %}
     >
     <span class="detail-upvotes">👍 {{ paper.upvotes }}</span>
     {% if paper.crawled_at %}
-    <span class="detail-upvote-time" title="投票数据更新时间">{{ paper.crawled_at.strftime('%m-%d %H:%M') }}</span>
+    <span class="detail-upvote-time" title="投票数据更新时间">{{ paper.crawled_at.strftime('%Y-%m-%d %H:%M') }}</span>
     {% endif %}
   </div>