feat: 实时消息与管理端运营能力

新增群聊/私信与公共 WebSocket 总线，站长用户内容档案，并将通知与待审角标改为推送驱动；同步精简管理仪表盘并修复主题换肤 DOM 冲突。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/globals.css

@@ -155,6 +155,89 @@ h1, h2, h3, h4 {
   border-radius: 6px;
 }
 
+/* 消息侧栏搜索：单层描边，避免外框 + focus-visible 双线 */
+.j13-chat-search:focus-within {
+  border-color: var(--accent) !important;
+  box-shadow: 0 0 0 3px var(--accent-soft);
+}
+.j13-chat-search-input,
+.j13-chat-search-input:focus,
+.j13-chat-search-input:focus-visible {
+  outline: none !important;
+  box-shadow: none !important;
+}
+
+/* 聊天输入区：与搜索框同款聚焦态 */
+.j13-chat-composer:focus-within {
+  border-color: var(--accent) !important;
+  box-shadow: 0 0 0 3px var(--accent-soft);
+}
+.j13-chat-composer-input,
+.j13-chat-composer-input:focus,
+.j13-chat-composer-input:focus-visible {
+  outline: none !important;
+  box-shadow: none !important;
+  resize: none !important;
+}
+.j13-chat-composer-input.has-value {
+  color: transparent;
+  caret-color: var(--ink);
+}
+.j13-chat-composer-input.has-value::placeholder {
+  color: transparent;
+}
+.j13-chat-composer-mirror {
+  position: absolute;
+  inset: 0;
+  overflow: hidden;
+  pointer-events: none;
+  white-space: pre-wrap;
+  overflow-wrap: break-word;
+  word-break: break-word;
+  color: var(--ink);
+}
+.j13-mention-token {
+  display: inline-block;
+  padding: 2px 8px;
+  margin: 0 2px;
+  border-radius: 999px;
+  line-height: 1.35;
+  vertical-align: baseline;
+  /* 主题强调色加深 + 对比色字，胶囊形 */
+  background: color-mix(in srgb, var(--accent) 82%, #000);
+  color: #fff !important;
+  font-weight: 600;
+  text-decoration: none !important;
+  cursor: pointer;
+  transition: filter 0.12s ease, opacity 0.12s ease;
+  box-decoration-break: clone;
+  -webkit-box-decoration-break: clone;
+}
+a.j13-mention-token:hover {
+  filter: brightness(1.08);
+  opacity: 0.95;
+}
+.dark .j13-mention-token {
+  /* 暗色下 accent 偏亮，用实心 accent + 配套字色 */
+  background: var(--accent);
+  color: var(--accent-on) !important;
+}
+/* 输入镜像层：不加粗/不加 padding，避免与透明 textarea 字宽错位 */
+.j13-chat-composer-mirror .j13-mention-token {
+  display: inline;
+  padding: 0;
+  margin: 0;
+  line-height: inherit;
+  font-weight: inherit;
+  border-radius: 999px;
+  box-shadow: none;
+  background: color-mix(in srgb, var(--accent) 82%, #000);
+}
+.dark .j13-chat-composer-mirror .j13-mention-token {
+  background: var(--accent);
+  color: var(--accent-on) !important;
+}
+
 @layer components {
   /* ----- 小标签（旧名 .kicker 保留兼容） ----- */
   .kicker {
@@ -230,6 +313,22 @@ h1, h2, h3, h4 {
   .btn-primary:active:not(:disabled) {
     transform: translateY(0);
   }
+  /* 与 btn-primary 同款，历史类名兼容 */
+  .btn-accent {
+    background: var(--accent);
+    color: var(--accent-on);
+    box-shadow: 0 1px 2px rgba(16, 24, 40, 0.12),
+      0 2px 8px color-mix(in srgb, var(--accent) 26%, transparent);
+  }
+  .btn-accent:hover:not(:disabled) {
+    background: var(--accent-hi);
+    transform: translateY(-1px);
+    box-shadow: 0 2px 6px rgba(16, 24, 40, 0.1),
+      0 8px 20px color-mix(in srgb, var(--accent) 34%, transparent);
+  }
+  .btn-accent:active:not(:disabled) {
+    transform: translateY(0);
+  }
 
   .btn-line {
     background: var(--panel);
@@ -380,6 +479,18 @@ h1, h2, h3, h4 {
     border-radius: 999px;
     white-space: nowrap;
   }
+  .badge-pending {
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+    font-size: 12px;
+    font-weight: 700;
+    padding: 4px 11px;
+    background: var(--accent-soft);
+    color: var(--accent);
+    border-radius: 999px;
+    white-space: nowrap;
+  }
 
   /* 帖子列表中的板块小标签：全站统一浅灰配色，避免每行多色眩目 */
   .j13-board-tag {
@@ -539,6 +650,20 @@ h1, h2, h3, h4 {
     transform: scale(0.97);
   }
 
+  /* 帖子流「有新内容」提示条（三期） */
+  .j13-feed-new-tip:hover {
+    filter: brightness(0.97);
+  }
+  .j13-feed-new-tip:focus-visible {
+    outline: 2px solid var(--accent);
+    outline-offset: 2px;
+  }
+  @media (prefers-reduced-motion: reduce) {
+    .j13-feed-new-tip {
+      transition: none;
+    }
+  }
+
   /* 侧栏导航项 */
   .j13-raillink {
     display: flex;