style: 统一导航与目录的直角满行布局

src/admin.css

@@ -61,6 +61,12 @@ body {
 .admin-sider {
     height: 100%;
 }
+/* Naive 菜单背景默认左右内缩 8px；只铺满导航行，不改图标与文字缩进。 */
+.admin-sider .n-menu .n-menu-item-content::before {
+    left: 0;
+    right: 0;
+    border-radius: 0;
+}
 .admin-brand {
     display: flex;
     align-items: center;
@@ -452,11 +458,11 @@ body {
     display: flex;
     flex-direction: column;
     gap: 8px;
-    padding: 8px 10px 16px;
+    padding: 8px 0 16px;
 }
 .directory-group-heading {
     flex-shrink: 0;
-    padding: 14px 6px 2px;
+    padding: 14px 14px 2px;
     font:
         11px/1.6 ui-monospace,
         monospace;
@@ -472,7 +478,7 @@ body {
     height: auto;
     min-height: 88px;
     padding: 12px 14px;
-    border-radius: 5px;
+    border-radius: 0;
     white-space: normal;
     text-align: left;
 }
@@ -673,14 +679,15 @@ body {
     display: flex;
     flex-direction: column;
     gap: 6px;
-    padding: 4px 10px 18px;
+    padding: 4px 0 18px;
 }
 .n-button.reader-episode-link {
     flex-shrink: 0;
+    width: 100%;
     height: auto;
     min-height: 64px;
     padding: 12px 14px;
-    border-radius: 5px;
+    border-radius: 0;
     color: var(--app-muted);
     white-space: normal;
     text-align: left;
@@ -762,9 +769,6 @@ body {
         padding: 16px 12px 12px;
         flex-wrap: wrap;
     }
-    .reader-directory-content {
-        padding-inline: 6px;
-    }
     .n-button.reader-episode-link {
         padding: 12px 10px;
     }