feat: 主体目录增加母版缩略图与紧凑图文布局

src/admin.css

@@ -494,6 +494,74 @@ body {
     gap: 7px;
     min-width: 0;
 }
+/* 可选前导内容用于主体母版，不改变剧集与镜头目录的原有排版。 */
+.n-button.directory-item.has-leading .n-button__content {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+}
+.directory-item-leading {
+    display: flex;
+    flex-shrink: 0;
+}
+.directory-item.has-leading .directory-item-body {
+    flex: 1;
+}
+.identity-subject-list-content {
+    gap: 0;
+    padding: 0 0 8px;
+}
+.n-button.identity-subject-item {
+    min-height: 86px;
+    padding: 10px 14px;
+    border-bottom: 1px solid var(--app-border);
+}
+.n-button.identity-subject-item:not(.selected) {
+    background: var(--app-surface);
+}
+.n-button.identity-subject-item:not(.selected):hover {
+    background: var(--app-subtle);
+}
+.identity-subject-item .directory-item-body {
+    gap: 3px;
+}
+.identity-subject-item .directory-item-title {
+    order: 0;
+    font-size: 14px;
+    font-weight: 600;
+}
+.identity-subject-item .directory-item-eyebrow {
+    order: 1;
+    font-size: 10px;
+}
+.identity-subject-item .directory-item-meta {
+    order: 2;
+    gap: 4px 6px;
+    font-size: 10px;
+}
+.identity-thumbnail {
+    display: flex;
+    width: 48px;
+    height: 64px;
+    overflow: hidden;
+    background: var(--app-subtle);
+}
+.identity-thumbnail .n-image,
+.identity-thumbnail .n-image img {
+    width: 100%;
+    height: 100%;
+}
+.identity-thumbnail-placeholder {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    width: 100%;
+    height: 100%;
+    gap: 5px;
+    color: var(--app-muted);
+    font-size: 10px;
+}
 .directory-item-eyebrow {
     font:
         11px/1.5 ui-monospace,