fix(discovery): 修复真实书籍封面显示

static/css/styles.css

@@ -9,3 +9,6 @@
 @media(max-width:600px){.compact-value{font-size:20px}.list-art .mini-cover{width:56px}.full-books .cover{width:105px;height:159px}.goal-card .section-head{gap:10px}.book-row .mini-cover{display:none}.detail-tabs{gap:16px}.date-fields input{min-height:40px}.detail-info .primary{font-size:11px;padding:9px}}
 .mini-cover.c2,.mini-cover.c3{color:#fff5df}
 .export-preview{width:100%;height:320px;margin-top:20px;border:1px solid var(--line);border-radius:8px;padding:18px;background:var(--bg);color:var(--text);font:12px/1.9 'PingFang SC',sans-serif;resize:vertical}
+.real-cover{display:block;width:118px;height:168px;object-fit:cover;border-radius:4px;box-shadow:4px 5px 10px #0002;background:var(--quote)}
+.mini-real-cover{width:66px;height:92px;flex-shrink:0}
+.book-row .mini-real-cover{width:42px;height:58px}