fix: 空评论列表 500，并完善撤回审计与角色说明

空切片 JSON 统一为数组；撤回保留正文供站长阅读，成员侧居中提示与重新编辑；头像支持拖放；角色弹窗补全职责说明并汇入封禁。

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

backend/handler/admin_user.go

@@ -102,7 +102,7 @@ func (h *Handlers) AdminUserLoginLogs(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取登录历史失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"logs": logs, "total": total, "page": page})
+	c.JSON(http.StatusOK, gin.H{"logs": nonNilSlice(logs), "total": total, "page": page})
 }
 
 // AdminGetUserAudit 站长：用户内容档案摘要
@@ -131,7 +131,7 @@ func (h *Handlers) AdminUserAuditPosts(c *gin.Context) {
 		respondAdminUserError(c, err)
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"items": items, "total": total, "page": page})
+	c.JSON(http.StatusOK, gin.H{"items": nonNilSlice(items), "total": total, "page": page})
 }
 
 // AdminUserAuditComments 站长：用户评论（含驳回/软删）
@@ -146,7 +146,7 @@ func (h *Handlers) AdminUserAuditComments(c *gin.Context) {
 		respondAdminUserError(c, err)
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"items": items, "total": total, "page": page})
+	c.JSON(http.StatusOK, gin.H{"items": nonNilSlice(items), "total": total, "page": page})
 }
 
 // AdminUserAuditMessages 站长：用户聊天消息（含撤回/软删）
@@ -161,7 +161,7 @@ func (h *Handlers) AdminUserAuditMessages(c *gin.Context) {
 		respondAdminUserError(c, err)
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"items": items, "total": total, "page": page})
+	c.JSON(http.StatusOK, gin.H{"items": nonNilSlice(items), "total": total, "page": page})
 }
 
 // parseAdminUserID 解析路径中的用户 ID，失败时直接写出 400

backend/handler/announcement.go

@@ -19,7 +19,7 @@ func (h *Handlers) AnnouncementsList(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取公告失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"announcements": list})
+	c.JSON(http.StatusOK, gin.H{"announcements": nonNilSlice(list)})
 }
 
 // AnnouncementDetail 已发布公告详情
@@ -50,7 +50,7 @@ func (h *Handlers) AdminListAnnouncements(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取公告失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"announcements": list})
+	c.JSON(http.StatusOK, gin.H{"announcements": nonNilSlice(list)})
 }
 
 // AdminCreateAnnouncement 新建公告

backend/handler/board.go

@@ -13,5 +13,5 @@ func (h *Handlers) Boards(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"boards": boards})
+	c.JSON(http.StatusOK, gin.H{"boards": nonNilSlice(boards)})
 }

backend/handler/chat.go

@@ -98,7 +98,7 @@ func (h *Handlers) ListChatRooms(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取会话列表失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"rooms": rooms, "total": total, "page": page, "size": size})
+	c.JSON(http.StatusOK, gin.H{"rooms": nonNilSlice(rooms), "total": total, "page": page, "size": size})
 }
 
 // GetChatRoom 群详情（公开非成员可预览；私密非成员 404）
@@ -273,7 +273,7 @@ func (h *Handlers) ListChatMembers(c *gin.Context) {
 		c.JSON(chatErrToStatus(err), gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"members": list})
+	c.JSON(http.StatusOK, gin.H{"members": nonNilSlice(list)})
 }
 
 // KickChatMember 群主踢人
@@ -315,7 +315,7 @@ func (h *Handlers) ListChatMessages(c *gin.Context) {
 		c.JSON(chatErrToStatus(err), gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"messages": msgs, "has_more": hasMore})
+	c.JSON(http.StatusOK, gin.H{"messages": nonNilSlice(msgs), "has_more": hasMore})
 }
 
 // SendChatMessage 发消息
@@ -387,16 +387,30 @@ func (h *Handlers) RecallChatMessage(c *gin.Context) {
 		c.JSON(chatErrToStatus(err), gin.H{"error": err.Error()})
 		return
 	}
-	h.Hub.BroadcastRoom(realtime.RoomChat(roomID), realtime.Envelope{
-		Type: realtime.EventChatRecalled,
-		Data: gin.H{
+	data := gin.H{
 		"id":          msg.ID,
 		"room_id":     roomID,
 		"sender_id":   msg.SenderID,
 		"recalled_by": msg.RecalledBy,
 		"recalled_at": msg.RecalledAt,
-		},
+	}
+	if msg.Recaller != nil && msg.Recaller.ID > 0 {
+		data["recaller"] = gin.H{
+			"id":       msg.Recaller.ID,
+			"username": msg.Recaller.Username,
+			"nickname": msg.Recaller.Nickname,
+			"avatar":   msg.Recaller.Avatar,
+			"role":     msg.Recaller.Role,
+		}
+	}
+	h.Hub.BroadcastRoom(realtime.RoomChat(roomID), realtime.Envelope{
+		Type: realtime.EventChatRecalled,
+		Data: data,
 	})
+	// 监管者保留正文供界面展示；撤回者本人保留正文供「重新编辑」；其余不回传
+	if !oversee && msg.SenderID != claims.ID {
+		msg.Content = ""
+	}
 	c.JSON(http.StatusOK, gin.H{"message": msg})
 }
 
@@ -444,7 +458,7 @@ func (h *Handlers) SearchChatUsers(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "搜索失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"users": users})
+	c.JSON(http.StatusOK, gin.H{"users": nonNilSlice(users)})
 }
 
 // ChatUnreadSummary 未读汇总

backend/handler/comment.go

@@ -44,7 +44,7 @@ func (h *Handlers) PostComments(c *gin.Context) {
 		return
 	}
 	c.JSON(http.StatusOK, gin.H{
-		"comments":       comments,
+		"comments":       nonNilSlice(comments),
 		"total":          floors,        // 楼层数（主评论数）→ 前端分页与楼层号计算
 		"total_comments": totalComments, // 全部评论数（含回复）→ 展示徽标
 		"page":           page,

backend/handler/jsonutil.go

@@ -0,0 +1,9 @@
+package handler
+
+// nonNilSlice 保证 JSON 序列化为 [] 而非 null（Go nil slice 会编成 null）。
+func nonNilSlice[T any](s []T) []T {
+	if s == nil {
+		return []T{}
+	}
+	return s
+}

backend/handler/moderation.go

@@ -21,7 +21,7 @@ func (h *Handlers) AdminPendingPosts(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取待审帖子失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"posts": posts, "total": total, "page": page})
+	c.JSON(http.StatusOK, gin.H{"posts": nonNilSlice(posts), "total": total, "page": page})
 }
 
 // AdminPendingComments 待审核评论分页
@@ -32,7 +32,7 @@ func (h *Handlers) AdminPendingComments(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "获取待审评论失败"})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"comments": comments, "total": total, "page": page})
+	c.JSON(http.StatusOK, gin.H{"comments": nonNilSlice(comments), "total": total, "page": page})
 }
 
 // AdminPendingCounts 当前操作者可见的待审数量（导航角标）

backend/handler/notification.go

@@ -20,7 +20,7 @@ func (h *Handlers) Notifications(c *gin.Context) {
 		return
 	}
 	c.JSON(http.StatusOK, gin.H{
-		"notifications": list,
+		"notifications": nonNilSlice(list),
 		"total":         total,
 		"page":          page,
 		"size":          size,

backend/handler/upload.go

@@ -77,7 +77,7 @@ func (h *Handlers) MyMedia(c *gin.Context) {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
 		return
 	}
-	c.JSON(http.StatusOK, gin.H{"attachments": list})
+	c.JSON(http.StatusOK, gin.H{"attachments": nonNilSlice(list)})
 }
 
 // DeleteAttachment 彻底删除本人附件（DB + 物理文件）

backend/handler/user.go

@@ -104,6 +104,9 @@ func (h *Handlers) UserProfile(c *gin.Context) {
 	if user.Role == model.RoleBoardAdmin {
 		boardIDs, _ = h.Auth.GetUserBoardIDs(user.ID)
 	}
+	if boardIDs == nil {
+		boardIDs = []uint{}
+	}
 
 	c.JSON(http.StatusOK, gin.H{
 		"user": gin.H{
@@ -122,7 +125,7 @@ func (h *Handlers) UserProfile(c *gin.Context) {
 			"points":        pointsTotal,
 			"streak":        streak,
 		},
-		"posts":       posts,
+		"posts":       nonNilSlice(posts),
 		"posts_total": postsTotal,
 		"page":        page,
 		"size":        size,
@@ -152,7 +155,7 @@ func (h *Handlers) UserComments(c *gin.Context) {
 	}
 
 	c.JSON(http.StatusOK, gin.H{
-		"comments": comments,
+		"comments": nonNilSlice(comments),
 		"total":    total,
 		"page":     page,
 		"size":     size,

backend/model/models.go

@@ -319,4 +319,6 @@ type ChatMessage struct {
 	DeletedAt  gorm.DeletedAt `gorm:"index" json:"-"`
 
 	Sender   User  `gorm:"foreignKey:SenderID" json:"sender,omitempty"`
+	// RecalledBy=0 时不建 FK；Preload 仅用于已撤回消息展示撤回者昵称
+	Recaller *User `gorm:"foreignKey:RecalledBy;constraint:-" json:"recaller,omitempty"`
 }

backend/service/admin_user.go

@@ -652,8 +652,9 @@ func (s *AdminUserService) ListAuditMessages(actor *Actor, userID uint, page, si
 		}
 		content := m.Content
 		recalled := m.RecalledAt != nil
+		// 历史数据：早期撤回曾清空正文，无法还原
 		if recalled && content == "" {
-			content = "（已撤回的消息）"
+			content = "（撤回时未保留正文）"
 		}
 		it := AdminAuditMessageItem{
 			ID:        m.ID,

backend/service/chat.go

@@ -153,6 +153,10 @@ func (s *ChatService) toViews(rooms []model.ChatRoom, userID uint) []RoomView {
 	unread := s.unreadCounts(userID, ids)
 	views := make([]RoomView, 0, len(rooms))
 	for _, r := range rooms {
+		// 会话列表预览不向前台下发已撤回正文
+		if r.LastMessage != nil && r.LastMessage.RecalledAt != nil {
+			r.LastMessage.Content = ""
+		}
 		v := RoomView{ChatRoom: r, UnreadCount: unread[r.ID]}
 		if r.IsDefault {
 			v.Pinned = true
@@ -887,7 +891,7 @@ func (s *ChatService) ListMessages(userID, roomID, beforeID uint, size int, over
 		q = q.Where("id < ?", beforeID)
 	}
 	var msgs []model.ChatMessage
-	if err := q.Order("id DESC").Limit(size + 1).Preload("Sender").Find(&msgs).Error; err != nil {
+	if err := q.Order("id DESC").Limit(size + 1).Preload("Sender").Preload("Recaller").Find(&msgs).Error; err != nil {
 		return nil, false, err
 	}
 	hasMore := len(msgs) > size
@@ -897,7 +901,7 @@ func (s *ChatService) ListMessages(userID, roomID, beforeID uint, size int, over
 	for i, j := 0, len(msgs)-1; i < j; i, j = i+1, j-1 {
 		msgs[i], msgs[j] = msgs[j], msgs[i]
 	}
-	// 对非监管者清空已撤回正文
+	// 已撤回正文：仅监管者（站长/超管）保留，供聊天界面审计展示；普通成员清空
 	if !oversee {
 		for i := range msgs {
 			if msgs[i].RecalledAt != nil {
@@ -908,7 +912,7 @@ func (s *ChatService) ListMessages(userID, roomID, beforeID uint, size int, over
 	return msgs, hasMore, nil
 }
 
-// RecallMessage 撤回消息：群主可撤自己的；监管者可撤任意；标记 RecalledAt 不清行
+// RecallMessage 撤回消息：群主可撤自己的；监管者可撤任意；标记 RecalledAt，正文保留供审计
 func (s *ChatService) RecallMessage(operatorID, roomID, messageID uint, oversee bool) (*model.ChatMessage, error) {
 	if _, err := s.getRoom(roomID); err != nil {
 		return nil, err
@@ -935,17 +939,16 @@ func (s *ChatService) RecallMessage(operatorID, roomID, messageID uint, oversee
 		}
 	}
 	now := time.Now()
+	// 只打撤回标记，保留正文供站长审计；前台 ListMessages 对非监管者置空 content
 	if err := s.db.Model(&msg).Updates(map[string]interface{}{
 		"recalled_at": now,
 		"recalled_by": operatorID,
-		"content":     "",
 	}).Error; err != nil {
 		return nil, err
 	}
 	msg.RecalledAt = &now
 	msg.RecalledBy = operatorID
-	msg.Content = ""
-	_ = s.db.Preload("Sender").First(&msg, msg.ID)
+	_ = s.db.Preload("Sender").Preload("Recaller").First(&msg, msg.ID)
 	return &msg, nil
 }
 

backend/service/comment.go

@@ -225,6 +225,9 @@ func (s *CommentService) ListByUser(userID uint, page, size int) ([]UserCommentI
 	if err := query.Order("comments.created_at DESC").Offset(offset).Limit(size).Scan(&items).Error; err != nil {
 		return nil, 0, err
 	}
+	if items == nil {
+		items = []UserCommentItem{}
+	}
 	return items, total, nil
 }
 

frontend/app/admin/AdminNav.tsx

@@ -22,6 +22,7 @@ import {
   type RoleUserLike,
 } from "@/lib/roles";
 import { realtime, RT_MODERATION_CHANGED } from "@/lib/realtime";
+import { onDocumentVisible } from "@/lib/visibilityReconcile";
 import Avatar from "@/components/Avatar";
 import RoleBadge from "@/components/RoleBadge";
 
@@ -85,14 +86,11 @@ function usePendingCounts(enabled: boolean) {
     };
     load();
     const off = realtime.on(RT_MODERATION_CHANGED, () => load());
-    const onVisible = () => {
-      if (document.visibilityState === "visible") load();
-    };
-    document.addEventListener("visibilitychange", onVisible);
+    const offVisible = onDocumentVisible(load);
     return () => {
       alive = false;
       off();
-      document.removeEventListener("visibilitychange", onVisible);
+      offVisible();
     };
   }, [enabled]);
   return counts.posts + counts.comments;

frontend/app/admin/users/UsersAdmin.tsx

@@ -32,7 +32,7 @@ import {
   type Board,
   type LoginLog,
 } from "@/lib/api";
-import { isOwner, ROLES } from "@/lib/roles";
+import { isOwner, ROLES, ROLE_META } from "@/lib/roles";
 import { formatDate, formatRelative } from "@/lib/format";
 import { toast } from "@/lib/toast";
 import { realtime } from "@/lib/realtime";
@@ -60,7 +60,6 @@ interface RoleOption {
   value: string;
   title: string;
   desc: string;
-  icon: React.ReactNode;
   token: string;
 }
 
@@ -131,9 +130,7 @@ export default function UsersAdmin({
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState(initError);
   const [actingId, setActingId] = useState<number | null>(null);
-  // 封禁二次确认弹窗；null 关闭
-  const [banTarget, setBanTarget] = useState<AdminUser | null>(null);
-  // 角色授权弹窗 / 登录历史弹窗
+  // 角色与账号弹窗 / 登录历史弹窗
   const [roleTarget, setRoleTarget] = useState<AdminUser | null>(null);
   const [logsTarget, setLogsTarget] = useState<AdminUser | null>(null);
 
@@ -412,42 +409,33 @@ export default function UsersAdmin({
         </Link>
         <button
           type="button"
-          title="设置管理角色"
-          aria-label={`设置 ${u.username} 的管理角色`}
+          title="角色与账号"
+          aria-label={`设置 ${u.username} 的角色与账号状态`}
           disabled={busy}
           onClick={() => setRoleTarget(u)}
           className={ghostBtn}
-          style={u.role === ROLES.USER ? { color: "var(--ink-3)" } : { color: "var(--accent)" }}
+          style={
+            u.banned
+              ? { color: "var(--danger)" }
+              : u.role === ROLES.USER
+                ? { color: "var(--ink-3)" }
+                : { color: "var(--accent)" }
+          }
           onMouseEnter={(e) => {
-            e.currentTarget.style.background = "var(--accent-soft)";
-            e.currentTarget.style.color = "var(--accent)";
+            e.currentTarget.style.background = u.banned ? "var(--danger-soft)" : "var(--accent-soft)";
+            e.currentTarget.style.color = u.banned ? "var(--danger)" : "var(--accent)";
           }}
           onMouseLeave={(e) => {
             e.currentTarget.style.background = "";
-            e.currentTarget.style.color = u.role === ROLES.USER ? "var(--ink-3)" : "var(--accent)";
+            e.currentTarget.style.color = u.banned
+              ? "var(--danger)"
+              : u.role === ROLES.USER
+                ? "var(--ink-3)"
+                : "var(--accent)";
           }}
         >
           <ShieldCheck size={15} />
         </button>
-        <button
-          type="button"
-          title={u.banned ? "解封" : "封禁"}
-          aria-label={u.banned ? `解封 ${u.username}` : `封禁 ${u.username}`}
-          disabled={busy}
-          onClick={() => setBanTarget(u)}
-          className={ghostBtn}
-          style={u.banned ? { color: "var(--danger)" } : { color: "var(--ink-3)" }}
-          onMouseEnter={(e) => {
-            e.currentTarget.style.background = "var(--danger-soft)";
-            e.currentTarget.style.color = "var(--danger)";
-          }}
-          onMouseLeave={(e) => {
-            e.currentTarget.style.background = "";
-            e.currentTarget.style.color = u.banned ? "var(--danger)" : "var(--ink-3)";
-          }}
-        >
-          {u.banned ? <RotateCcw size={15} /> : <Ban size={15} />}
-        </button>
       </div>
     );
   };
@@ -475,7 +463,7 @@ export default function UsersAdmin({
           用户管理
         </h1>
         <p className="meta mt-1.5 text-[12.5px]">
-          检索全部成员，配置管理角色与板块授权；站长账号受保护，操作即时生效
+          检索全部成员；在「角色与账号」中配置管理角色、板块授权与封禁；站长账号受保护
         </p>
       </div>
 
@@ -738,24 +726,16 @@ export default function UsersAdmin({
                             disabled={actingId === u.id}
                             onClick={() => setRoleTarget(u)}
                             className="btn btn-line btn-sm"
-                            style={u.role !== ROLES.USER ? { color: "var(--accent)", borderColor: "var(--accent)" } : undefined}
-                          >
-                            <ShieldCheck size={13} />
-                            角色权限
-                          </button>
-                          <button
-                            type="button"
-                            disabled={actingId === u.id}
-                            onClick={() => setBanTarget(u)}
-                            className="btn btn-sm"
                             style={
                               u.banned
-                                ? { background: "var(--ok-soft)", color: "var(--ok)" }
-                                : { background: "var(--danger-soft)", color: "var(--danger)" }
+                                ? { color: "var(--danger)", borderColor: "var(--danger)" }
+                                : u.role !== ROLES.USER
+                                  ? { color: "var(--accent)", borderColor: "var(--accent)" }
+                                  : undefined
                             }
                           >
-                            {u.banned ? <RotateCcw size={13} /> : <Ban size={13} />}
-                            {u.banned ? "解封" : "封禁"}
+                            <ShieldCheck size={13} />
+                            角色与账号
                           </button>
                         </>
                       )}
@@ -811,33 +791,12 @@ export default function UsersAdmin({
         setActing={(v) => setActingId(v ? roleTarget?.id ?? null : null)}
       />
 
-      <BanConfirmDialog
-        target={banTarget}
-        busy={actingId === banTarget?.id}
-        onCancel={() => setBanTarget(null)}
-        onConfirm={async () => {
-          const u = banTarget;
-          if (!u) return;
-          setActingId(u.id);
-          try {
-            await apiAdminSetUserBan(u.id, !u.banned);
-            toast(u.banned ? "已解封" : "已封禁", "ok");
-            setBanTarget(null);
-            await reload();
-          } catch (e) {
-            toast(e instanceof Error ? e.message : "操作失败");
-          } finally {
-            setActingId(null);
-          }
-        }}
-      />
-
       <LoginLogsDialog target={logsTarget} onClose={() => setLogsTarget(null)} />
     </div>
   );
 }
 
-// ===== 角色授权弹窗 =====
+// ===== 角色与账号弹窗（角色授权 + 封禁状态） =====
 
 function RoleAssignDialog({
   target,
@@ -856,47 +815,35 @@ function RoleAssignDialog({
   onSaved: () => void;
   setActing: (v: boolean) => void;
 }) {
-  // 可授予角色（按等级从高到低）；超管选项仅站长可见
-  const options: RoleOption[] = [
-    {
-      value: ROLES.SUPER_ADMIN,
-      title: "超级管理员",
-      desc: "可操作全站后台：用户权限、公告、外观设置、内容审核；站长账号除外",
-      icon: <ShieldCheck size={18} />,
-      token: "--accent",
-    },
-    {
-      value: ROLES.ADMIN,
-      title: "管理员",
-      desc: "可管理公告，审核全站帖子与评论，可置顶/加精",
-      icon: <ShieldCheck size={18} />,
-      token: "--accent",
-    },
-    {
-      value: ROLES.BOARD_ADMIN,
-      title: "板块管理员",
-      desc: "仅可审核被授权板块的帖子与评论",
-      icon: <ShieldCheck size={18} />,
-      token: "--accent",
-    },
-    {
-      value: ROLES.USER,
-      title: "普通用户",
-      desc: "无后台权限；发帖与评论需通过审核",
-      icon: <UsersIcon size={18} />,
-      token: "--ink-3",
-    },
-  ].filter((o) => canGrantSuper || o.value !== ROLES.SUPER_ADMIN);
+  const grantKeys = [
+    ROLES.SUPER_ADMIN,
+    ROLES.ADMIN,
+    ROLES.BOARD_ADMIN,
+    ROLES.USER,
+  ] as const;
+
+  const options: RoleOption[] = grantKeys
+    .filter((k) => canGrantSuper || k !== ROLES.SUPER_ADMIN)
+    .map((k) => {
+      const meta = ROLE_META[k];
+      return {
+        value: k,
+        title: meta.label,
+        desc: meta.grantDesc || "",
+        token: meta.colorToken,
+      };
+    });
 
   const [role, setRole] = useState<string>(ROLES.USER);
   const [boardIds, setBoardIds] = useState<number[]>([]);
+  const [banned, setBanned] = useState(false);
   const [err, setErr] = useState("");
 
-  // 每次打开按目标当前角色/授权初始化
   useEffect(() => {
     if (target) {
       setRole(target.role === ROLES.OWNER ? ROLES.USER : target.role);
       setBoardIds(target.board_ids ?? []);
+      setBanned(!!target.banned);
       setErr("");
     }
   }, [target]);
@@ -916,15 +863,36 @@ function RoleAssignDialog({
     setBoardIds((prev) => (prev.includes(id) ? prev.filter((b) => b !== id) : [...prev, id]));
   };
 
+  const sameBoards =
+    JSON.stringify([...(target.board_ids ?? [])].sort((a, b) => a - b)) ===
+    JSON.stringify([...boardIds].sort((a, b) => a - b));
+  const roleChanged = role !== target.role || (role === ROLES.BOARD_ADMIN && !sameBoards);
+  const banChanged = banned !== !!target.banned;
+  const willBan = banChanged && banned;
+  const willUnban = banChanged && !banned;
+
   const submit = async () => {
     if (role === ROLES.BOARD_ADMIN && boardIds.length === 0) {
       setErr("请至少选择一个授权板块");
       return;
     }
+    if (!roleChanged && !banChanged) {
+      onClose();
+      return;
+    }
     setActing(true);
     try {
+      if (roleChanged) {
         await apiAdminSetUserRole(target.id, role, role === ROLES.BOARD_ADMIN ? boardIds : []);
-      toast("角色权限已更新", "ok");
+      }
+      if (banChanged) {
+        await apiAdminSetUserBan(target.id, banned);
+      }
+      const parts: string[] = [];
+      if (roleChanged) parts.push("角色已更新");
+      if (willBan) parts.push("已封禁");
+      if (willUnban) parts.push("已解封");
+      toast(parts.join(" · ") || "已保存", "ok");
       onSaved();
     } catch (e) {
       toast(e instanceof Error ? e.message : "操作失败");
@@ -933,6 +901,8 @@ function RoleAssignDialog({
     }
   };
 
+  const saveLabel = willBan ? "保存并封禁" : willUnban ? "保存并解封" : "保存";
+
   return (
     <div
       className="fixed inset-0 z-[1000] flex items-center justify-center p-4"
@@ -940,17 +910,17 @@ function RoleAssignDialog({
       onClick={() => !acting && onClose()}
     >
       <div
-        className="j13-toast-in panel w-full max-w-[460px] rounded-2xl p-6 max-h-[88vh] overflow-y-auto"
+        className="j13-toast-in panel w-full max-w-[500px] rounded-2xl p-6 max-h-[88vh] overflow-y-auto"
         style={{ boxShadow: "var(--shadow-lg)" }}
         onClick={(e) => e.stopPropagation()}
         role="dialog"
         aria-modal="true"
-        aria-label="设置管理角色"
+        aria-label="角色与账号"
       >
         <div className="flex items-start justify-between gap-3">
           <div className="min-w-0">
             <h3 className="text-[16px] font-extrabold tracking-tight" style={{ color: "var(--ink)" }}>
-              设置管理角色
+              角色与账号
             </h3>
             <p className="meta mt-1 text-[12.5px] truncate">
               @{target.username}（{target.nickname}）
@@ -968,7 +938,14 @@ function RoleAssignDialog({
           </button>
         </div>
 
-        <div className="mt-4 flex flex-col gap-2" role="radiogroup" aria-label="管理角色">
+        <p className="mt-3 text-[12px] leading-relaxed" style={{ color: "var(--ink-3)" }}>
+          角色决定后台入口与前台管理能力；封禁立即强制下线。登录历史、站长内容档案仍走列表其他入口。
+        </p>
+
+        <p className="mt-4 mb-2 text-[12.5px] font-bold" style={{ color: "var(--ink)" }}>
+          管理角色
+        </p>
+        <div className="flex flex-col gap-2" role="radiogroup" aria-label="管理角色">
           {options.map((o) => {
             const active = role === o.value;
             return (
@@ -981,7 +958,7 @@ function RoleAssignDialog({
                   setRole(o.value);
                   setErr("");
                 }}
-                className="text-left rounded-xl p-3 flex items-start gap-3 transition-colors"
+                className="text-left rounded-xl p-3.5 flex items-start gap-3 transition-colors"
                 style={{
                   border: `1.5px solid ${active ? "var(--accent)" : "var(--line)"}`,
                   background: active ? "var(--accent-soft)" : "var(--panel-2)",
@@ -995,13 +972,13 @@ function RoleAssignDialog({
                   }}
                   aria-hidden="true"
                 >
-                  {o.icon}
+                  {o.value === ROLES.USER ? <UsersIcon size={18} /> : <ShieldCheck size={18} />}
                 </span>
                 <span className="min-w-0 flex-1">
                   <span className="block text-[13.5px] font-bold" style={{ color: "var(--ink)" }}>
                     {o.title}
                   </span>
-                  <span className="block mt-0.5 text-[12px] leading-relaxed" style={{ color: "var(--ink-3)" }}>
+                  <span className="block mt-1 text-[12px] leading-relaxed" style={{ color: "var(--ink-3)" }}>
                     {o.desc}
                   </span>
                 </span>
@@ -1017,7 +994,6 @@ function RoleAssignDialog({
           })}
         </div>
 
-        {/* 板块授权（仅板块管理员） */}
         {role === ROLES.BOARD_ADMIN && (
           <div className="mt-4">
             <p className="text-[12.5px] font-bold mb-2" style={{ color: "var(--ink)" }}>
@@ -1060,111 +1036,89 @@ function RoleAssignDialog({
                 })}
               </div>
             )}
-            {err && <p className="mt-2 text-[12px] font-semibold" style={{ color: "var(--danger)" }}>{err}</p>}
+            {err && (
+              <p className="mt-2 text-[12px] font-semibold" style={{ color: "var(--danger)" }}>
+                {err}
+              </p>
+            )}
           </div>
         )}
 
+        <div className="mt-5 pt-4" style={{ borderTop: "1px solid var(--line)" }}>
+          <p className="text-[12.5px] font-bold mb-2" style={{ color: "var(--ink)" }}>
+            账号状态
+          </p>
+          <div className="grid grid-cols-2 gap-2" role="radiogroup" aria-label="账号状态">
+            <button
+              type="button"
+              role="radio"
+              aria-checked={!banned}
+              onClick={() => setBanned(false)}
+              className="rounded-xl px-3 py-2.5 text-left transition-colors"
+              style={{
+                border: `1.5px solid ${!banned ? "var(--ok)" : "var(--line)"}`,
+                background: !banned ? "var(--ok-soft)" : "var(--panel-2)",
+              }}
+            >
+              <span
+                className="flex items-center gap-1.5 text-[13px] font-bold"
+                style={{ color: !banned ? "var(--ok)" : "var(--ink)" }}
+              >
+                <RotateCcw size={14} /> 正常
+              </span>
+              <span className="block mt-1 text-[11.5px] leading-snug" style={{ color: "var(--ink-3)" }}>
+                可登录与互动
+              </span>
+            </button>
+            <button
+              type="button"
+              role="radio"
+              aria-checked={banned}
+              onClick={() => setBanned(true)}
+              className="rounded-xl px-3 py-2.5 text-left transition-colors"
+              style={{
+                border: `1.5px solid ${banned ? "var(--danger)" : "var(--line)"}`,
+                background: banned ? "var(--danger-soft)" : "var(--panel-2)",
+              }}
+            >
+              <span
+                className="flex items-center gap-1.5 text-[13px] font-bold"
+                style={{ color: banned ? "var(--danger)" : "var(--ink)" }}
+              >
+                <Ban size={14} /> 封禁
+              </span>
+              <span className="block mt-1 text-[11.5px] leading-snug" style={{ color: "var(--ink-3)" }}>
+                强制下线，禁止登录
+              </span>
+            </button>
+          </div>
+          {willBan && (
+            <p className="mt-2 text-[12px] leading-relaxed" style={{ color: "var(--danger)" }}>
+              封禁后立即强制下线，无法登录、发帖与回复；已发布内容保留。角色变更与封禁将一并保存。
+            </p>
+          )}
+        </div>
+
         <div className="flex items-center justify-end gap-2 mt-5">
           <button type="button" className="btn btn-line" onClick={onClose} disabled={acting}>
             取消
           </button>
-          <button type="button" className="btn" onClick={submit} disabled={acting}>
-            {acting && <Loader2 size={15} className="animate-spin" />}
-            保存角色
-          </button>
-        </div>
-      </div>
-    </div>
-  );
-}
-
-// ===== 封禁确认弹窗 =====
-
-function BanConfirmDialog({
-  target,
-  busy,
-  onCancel,
-  onConfirm,
-}: {
-  target: AdminUser | null;
-  busy: boolean;
-  onCancel: () => void;
-  onConfirm: () => void;
-}) {
-  useEffect(() => {
-    if (!target) return;
-    const onKey = (e: KeyboardEvent) => {
-      if (e.key === "Escape" && !busy) onCancel();
-    };
-    window.addEventListener("keydown", onKey);
-    return () => window.removeEventListener("keydown", onKey);
-  }, [target, busy, onCancel]);
-
-  if (!target) return null;
-  const banning = !target.banned;
-
-  return (
-    <div
-      className="fixed inset-0 z-[1000] flex items-center justify-center p-4"
-      style={{ background: "color-mix(in srgb, var(--ink) 55%, transparent)" }}
-      onClick={() => !busy && onCancel()}
-    >
-      <div
-        className="j13-toast-in panel w-full max-w-[400px] rounded-2xl p-6"
-        style={{ boxShadow: "var(--shadow-lg)" }}
-        onClick={(e) => e.stopPropagation()}
-        role="dialog"
-        aria-modal="true"
-      >
-        <div className="flex items-start gap-4">
-          <span
-            className="w-12 h-12 rounded-full flex items-center justify-center shrink-0"
-            style={{
-              background: banning ? "var(--danger-soft)" : "var(--ok-soft)",
-              color: banning ? "var(--danger)" : "var(--ok)",
-            }}
-            aria-hidden="true"
-          >
-            {banning ? <Ban size={23} /> : <RotateCcw size={21} />}
-          </span>
-          <div className="min-w-0 flex-1">
-            <h3 className="text-[16px] font-extrabold tracking-tight" style={{ color: "var(--ink)" }}>
-              {banning ? "封禁账号" : "解除封禁"}
-            </h3>
-            <p className="meta mt-1.5 text-[13px] leading-relaxed">
-              {banning
-                ? `封禁后 @${target.username} 将被立即强制下线，无法登录、发帖与回复；其已发布内容保留。`
-                : `解除后 @${target.username} 可以重新登录，并恢复发帖、回复等全部功能。`}
-            </p>
-          </div>
-        </div>
-        <div className="flex items-center justify-end gap-2 mt-5">
-          <button type="button" className="btn btn-line" onClick={onCancel} disabled={busy} autoFocus>
-            取消
-          </button>
-          {banning ? (
-            <button type="button" className="btn btn-danger" onClick={onConfirm} disabled={busy}>
-              {busy && <Loader2 size={15} className="animate-spin" />}
-              确认封禁
-            </button>
-          ) : (
           <button
             type="button"
-              className="btn"
-              style={{ background: "var(--ok-soft)", color: "var(--ok)" }}
-              onClick={onConfirm}
-              disabled={busy}
+            className={willBan ? "btn btn-danger" : "btn"}
+            onClick={submit}
+            disabled={acting}
           >
-              {busy && <Loader2 size={15} className="animate-spin" />}
-              解除封禁
+            {acting && <Loader2 size={15} className="animate-spin" />}
+            {saveLabel}
           </button>
-          )}
         </div>
       </div>
     </div>
   );
 }
 
+
 // ===== 登录历史弹窗 =====
 
 function LoginLogsDialog({ target, onClose }: { target: AdminUser | null; onClose: () => void }) {

frontend/app/chat/ChatShell.tsx

@@ -22,6 +22,7 @@ import {
 } from "@/lib/api";
 import { realtime, RT_CHAT_UNREAD, RT_CHAT_MEMBERSHIP } from "@/lib/realtime";
 import type { RtChatUnreadData, RtChatMembershipData } from "@/lib/realtime";
+import { onDocumentVisible } from "@/lib/visibilityReconcile";
 import { toast } from "@/lib/toast";
 import Avatar from "@/components/Avatar";
 import ContextMenu, { type CtxMenuItem } from "@/components/ContextMenu";
@@ -114,28 +115,35 @@ export default function ChatShell({
     setRooms(sortRooms(initialRooms));
   }, [initialRooms]);
 
-  const refreshRooms = useCallback(async () => {
+  const roomsInFlight = useRef(false);
+  const lastRoomsFetchAt = useRef(0);
+
+  const refreshRooms = useCallback(async (opts?: { force?: boolean }) => {
+    const now = Date.now();
+    if (!opts?.force) {
+      if (roomsInFlight.current) return;
+      // 切房/回前台可合并；建群、被邀请等走 force
+      if (now - lastRoomsFetchAt.current < 2_000) return;
+    }
+    roomsInFlight.current = true;
+    lastRoomsFetchAt.current = now;
     try {
       const res = await apiListChatRooms(1, 50, "", "joined");
       setRooms(sortRooms(res.rooms || []));
     } catch {
       // 静默
+    } finally {
+      roomsInFlight.current = false;
     }
   }, []);
 
-  // 每次进入消息壳都用 HTTP 拉最新排序（避免首页 Link 预取/路由缓存导致新消息会话不置顶）
+  // 进入消息壳 / 切会话：HTTP 拉最新排序（避开预取缓存）
   useEffect(() => {
-    refreshRooms();
+    void refreshRooms();
   }, [refreshRooms, activeRoomId]);
 
-  // 从其他标签页切回时也对账一次
-  useEffect(() => {
-    const onVisible = () => {
-      if (document.visibilityState === "visible") refreshRooms();
-    };
-    document.addEventListener("visibilitychange", onVisible);
-    return () => document.removeEventListener("visibilitychange", onVisible);
-  }, [refreshRooms]);
+  // 从其他标签页切回时对账（10s 限频 + 上方 2s 合并）
+  useEffect(() => onDocumentVisible(() => void refreshRooms()), [refreshRooms]);
 
   // 实时未读：更新侧栏角标与预览，按置顶规则重排（不盲目置顶到最前）
   useEffect(() => {
@@ -145,7 +153,7 @@ export default function ChatShell({
       setRooms((prev) => {
         const idx = prev.findIndex((r) => r.id === data.room_id);
         if (idx < 0) {
-          refreshRooms();
+          void refreshRooms({ force: true });
           return prev;
         }
         const next = [...prev];
@@ -179,7 +187,7 @@ export default function ChatShell({
     const off = realtime.on<RtChatMembershipData>(RT_CHAT_MEMBERSHIP, (data) => {
       if (!data) return;
       if (data.status === "invited" || data.status === "dissolved" || data.status === "kicked") {
-        refreshRooms();
+        void refreshRooms({ force: true });
       }
     });
     return off;
@@ -230,7 +238,7 @@ export default function ChatShell({
       setQuery("");
       setUserHits([]);
       router.push(`/chat/${room.id}`);
-      refreshRooms();
+      void refreshRooms({ force: true });
     } catch (e) {
       toast(e instanceof Error ? e.message : "无法发起私聊");
     }
@@ -524,7 +532,7 @@ export default function ChatShell({
             setShowCreate(false);
             toast("群已创建", "ok");
             router.push(`/chat/${id}`);
-            refreshRooms();
+            void refreshRooms({ force: true });
           }}
         />
       )}

frontend/app/chat/[id]/ChatRoomClient.tsx

@@ -31,6 +31,7 @@ import {
   apiRecallChatMessage,
   type ChatMessage,
   type ChatRoomMember,
+  type User,
 } from "@/lib/api";
 import {
   realtime,
@@ -49,6 +50,30 @@ import Avatar from "@/components/Avatar";
 import ConfirmDialog from "@/components/ConfirmDialog";
 import ContextMenu, { type CtxMenuItem } from "@/components/ContextMenu";
 
+/** 同一房间已读：进行中去重 + 2s 内合并（滚动/新消息/Strict Mode 连打） */
+const MARK_READ_GAP_MS = 2_000;
+const markReadInflight = new Set<number>();
+const markReadLastAt = new Map<number, number>();
+
+function requestMarkChatRead(roomId: number): void {
+  const now = Date.now();
+  const last = markReadLastAt.get(roomId) || 0;
+  if (markReadInflight.has(roomId) || now - last < MARK_READ_GAP_MS) return;
+  markReadInflight.add(roomId);
+  markReadLastAt.set(roomId, now);
+  apiMarkChatRead(roomId, 0)
+    .then(() => {
+      window.dispatchEvent(new Event("j13-chat-unread-sync"));
+    })
+    .catch(() => {})
+    .finally(() => {
+      markReadInflight.delete(roomId);
+    });
+}
+
+/** 成员列表：并发去重（进房 effect 与面板刷新） */
+const membersInflight = new Set<number>();
+
 type RightPanel = null | "members" | "settings" | "invite";
 
 type ConfirmState = {
@@ -59,17 +84,83 @@ type ConfirmState = {
   action: () => Promise<void> | void;
 } | null;
 
-function recallLabel(m: ChatMessage, meId: number): string {
-  if (!m.recalled_at) return "";
-  // 操作者不是发送者 → 管理员/监管撤回
-  if (m.recalled_by && m.recalled_by !== m.sender_id) {
-    return "管理员撤回了此消息";
+/** 撤回提示：本人 / 他人撤回 / 管理员代撤 */
+function RecallNotice({
+  message,
+  meId,
+  members,
+}: {
+  message: ChatMessage;
+  meId: number;
+  members: ChatRoomMember[];
+}) {
+  if (!message.recalled_at) return null;
+  const by =
+    message.recalled_by ||
+    message.recaller?.id ||
+    message.sender_id;
+  // 操作者不是原发送者 → 监管代撤
+  const adminRecall = !!(by && by !== message.sender_id);
+
+  if (by === meId) {
+    return (
+      <span>
+        {adminRecall ? "你撤回了一条成员消息" : "你撤回了一条消息"}
+      </span>
+    );
   }
-  if (m.sender_id === meId || m.recalled_by === meId) {
-    return "你撤回了一条消息";
+
+  let recaller: User | null | undefined =
+    message.recaller && message.recaller.id
+      ? message.recaller
+      : by === message.sender_id
+        ? message.sender
+        : null;
+  if ((!recaller || !recaller.id) && by > 0) {
+    const hit = members.find((x) => x.user_id === by);
+    if (hit) recaller = hit.user;
   }
-  return "此消息已撤回";
+  const name =
+    (recaller?.nickname || recaller?.username || "").trim() || "有人";
+  const uid = recaller?.id || by;
+  const nameStyle = {
+    color: "color-mix(in srgb, var(--accent) 72%, var(--ink))",
+  } as const;
+  const nameNode =
+    uid > 0 ? (
+      <Link
+        href={`/u/${uid}`}
+        className="font-semibold transition-opacity hover:opacity-80"
+        style={nameStyle}
+        title={`查看 ${name} 的主页`}
+      >
+        {name}
+      </Link>
+    ) : (
+      <span className="font-semibold" style={nameStyle}>
+        {name}
+      </span>
+    );
+
+  if (adminRecall) {
+    return (
+      <span>
+        管理员
+        {nameNode}
+        撤回了一条成员消息
+      </span>
+    );
   }
+  return (
+    <span>
+      {nameNode}
+      撤回了一条消息
+    </span>
+  );
+}
+
+/** 撤回后「重新编辑」有效窗口（接近微信体验） */
+const RE_EDIT_MS = 2 * 60 * 1000;
 
 interface Props {
   roomId: number;
@@ -236,6 +327,10 @@ export default function ChatRoomClient({
   const [mentionIndex, setMentionIndex] = useState(0);
   /** 从选择器确认插入的 @，在输入区以 token 整体展示/删除 */
   const [mentionTokens, setMentionTokens] = useState<Set<string>>(() => new Set());
+  /** 本人撤回后的可重新编辑草稿（仅本端内存，不展示正文） */
+  const [reEditDrafts, setReEditDrafts] = useState<
+    Record<number, { text: string; until: number }>
+  >({});
   const longPressTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
 
   const listRef = useRef<HTMLDivElement>(null);
@@ -250,6 +345,40 @@ export default function ChatRoomClient({
   const oversee = canOverseeChat(meRole);
   const canManageInvite = !isDirect && (isOwner || oversee);
 
+  const rememberReEdit = useCallback((id: number, text: string) => {
+    const t = text.trim();
+    if (!t) return;
+    setReEditDrafts((prev) => ({
+      ...prev,
+      [id]: { text: t, until: Date.now() + RE_EDIT_MS },
+    }));
+  }, []);
+
+  const takeReEditDraft = useCallback((id: number): string | null => {
+    const d = reEditDrafts[id];
+    if (!d || Date.now() > d.until) return null;
+    return d.text;
+  }, [reEditDrafts]);
+
+  // 到期后清掉「重新编辑」，避免按钮残留
+  useEffect(() => {
+    const ids = Object.keys(reEditDrafts);
+    if (ids.length === 0) return;
+    const nearest = Math.min(...Object.values(reEditDrafts).map((d) => d.until));
+    const wait = Math.max(0, nearest - Date.now()) + 50;
+    const t = setTimeout(() => {
+      setReEditDrafts((prev) => {
+        const now = Date.now();
+        const next: typeof prev = {};
+        for (const [k, v] of Object.entries(prev)) {
+          if (v.until > now) next[Number(k)] = v;
+        }
+        return next;
+      });
+    }, wait);
+    return () => clearTimeout(t);
+  }, [reEditDrafts]);
+
   const scrollToBottom = useCallback((smooth = false) => {
     const el = listRef.current;
     if (!el) return;
@@ -261,34 +390,36 @@ export default function ChatRoomClient({
 
   const refreshMembers = useCallback(async () => {
     if (!canView) return;
+    if (membersInflight.has(roomId)) return;
+    membersInflight.add(roomId);
     try {
       const res = await apiListChatMembers(roomId);
       setMembers(res.members || []);
       if (res.members) setMemberCount(res.members.length);
     } catch {
       // 静默：@ 功能降级为纯文本
+    } finally {
+      membersInflight.delete(roomId);
     }
   }, [roomId, canView]);
 
   const markReadToLatest = useCallback(() => {
     if (!isRealMember) return;
-    apiMarkChatRead(roomId, 0)
-      .then(() => {
-        window.dispatchEvent(new Event("j13-chat-unread-sync"));
-      })
-      .catch(() => {});
+    requestMarkChatRead(roomId);
   }, [roomId, isRealMember]);
 
   useEffect(() => {
     if (!canView) return;
     realtime.joinRoom(roomId);
-    refreshMembers();
+    void refreshMembers();
     requestAnimationFrame(() => scrollToBottom(false));
     markReadToLatest();
     return () => {
       realtime.leaveRoom(roomId);
     };
-  }, [roomId, canView, refreshMembers, scrollToBottom, markReadToLatest]);
+    // 只随房间切换订阅/首拉；避免回调身份变化重复打 members/read
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [roomId, canView]);
 
   useEffect(() => {
     const off = realtime.on<RtChatMessageData>(RT_CHAT_MESSAGE, (data) => {
@@ -315,21 +446,34 @@ export default function ChatRoomClient({
     const off = realtime.on<RtChatRecalledData>(RT_CHAT_RECALLED, (data) => {
       if (!data || data.room_id !== roomId) return;
       setMessages((prev) =>
-        prev.map((m) =>
-          m.id === data.id
-            ? {
+        prev.map((m) => {
+          if (m.id !== data.id) return m;
+          // 本人撤回：草稿留给「重新编辑」，气泡不展示正文
+          if (m.sender_id === meId && m.content) {
+            rememberReEdit(m.id, m.content);
+          }
+          return {
             ...m,
-                content: "",
+            // 仅监管界面保留正文；普通成员（含撤回者自己）气泡不展示
+            content: oversee ? m.content : "",
             recalled_at: data.recalled_at || new Date().toISOString(),
             recalled_by: data.recalled_by,
             sender_id: data.sender_id || m.sender_id,
+            recaller: data.recaller
+              ? {
+                  id: data.recaller.id,
+                  username: data.recaller.username,
+                  nickname: data.recaller.nickname,
+                  avatar: data.recaller.avatar,
+                  role: data.recaller.role || "user",
                 }
-            : m
-        )
+              : m.recaller,
+          };
+        })
       );
     });
     return off;
-  }, [roomId]);
+  }, [roomId, oversee, meId, rememberReEdit]);
 
   useEffect(() => {
     const off = realtime.on<RtChatMembershipData>(
@@ -359,7 +503,7 @@ export default function ChatRoomClient({
     try {
       const before = messages[0].id;
       const res = await apiListChatMessages(roomId, before, 30);
-      if (res.messages.length > 0) {
+      if ((res.messages || []).length > 0) {
         setMessages((prev) => [...res.messages, ...prev]);
         setHasMore(res.has_more);
         requestAnimationFrame(() => {
@@ -672,6 +816,7 @@ export default function ChatRoomClient({
   };
 
   const handleRecall = (mid: number) => {
+    const snapshot = messages.find((m) => m.id === mid);
     setCtxMenu(null);
     setConfirm({
       title: "撤回消息",
@@ -680,14 +825,18 @@ export default function ChatRoomClient({
       danger: true,
       action: async () => {
         const { message } = await apiRecallChatMessage(roomId, mid);
+        const body = (message.content || snapshot?.content || "").trim();
+        const mine = (snapshot?.sender_id ?? message.sender_id) === meId;
+        if (mine && body) rememberReEdit(mid, body);
         setMessages((prev) =>
           prev.map((m) =>
             m.id === mid
               ? {
                   ...m,
-                  content: "",
+                  content: oversee ? body || m.content : "",
                   recalled_at: message.recalled_at || new Date().toISOString(),
                   recalled_by: message.recalled_by,
+                  recaller: message.recaller || m.recaller,
                 }
               : m
           )
@@ -697,6 +846,24 @@ export default function ChatRoomClient({
     });
   };
 
+  const handleReEdit = (mid: number) => {
+    const text = takeReEditDraft(mid);
+    if (!text) {
+      toast("重新编辑已过期");
+      return;
+    }
+    setReplyTo(null);
+    setContent(text);
+    requestAnimationFrame(() => {
+      const el = inputRef.current;
+      if (!el) return;
+      el.focus();
+      el.setSelectionRange(text.length, text.length);
+      el.style.height = "auto";
+      el.style.height = `${Math.min(el.scrollHeight, 120)}px`;
+    });
+  };
+
   const scrollToMsg = (id: number) => {
     const el = msgRefs.current.get(id);
     el?.scrollIntoView({ behavior: "smooth", block: "center" });
@@ -925,6 +1092,114 @@ export default function ChatRoomClient({
                       new Date(m.created_at).getTime() -
                         new Date(prev.created_at).getTime() <
                         5 * 60_000;
+                    const reEditText = mine ? takeReEditDraft(m.id) : null;
+
+                    // 普通成员：居中系统提示（本人可重新编辑）；不展示原文
+                    if (recalled && !(oversee && m.content)) {
+                      return (
+                        <div
+                          key={m.id}
+                          ref={(node) => {
+                            if (node) msgRefs.current.set(m.id, node);
+                            else msgRefs.current.delete(m.id);
+                          }}
+                          className="flex justify-center px-2 py-0.5"
+                        >
+                          <p
+                            className="text-[12px] leading-relaxed text-center max-w-[90%]"
+                            style={{ color: "var(--ink-3)" }}
+                          >
+                              <RecallNotice
+                                message={m}
+                                meId={meId}
+                                members={members}
+                              />
+                            {reEditText ? (
+                              <>
+                                {" "}
+                                <button
+                                  type="button"
+                                  onClick={() => handleReEdit(m.id)}
+                                  className="font-semibold transition-opacity hover:opacity-80"
+                                  style={{
+                                    color:
+                                      "color-mix(in srgb, var(--accent) 72%, var(--ink))",
+                                  }}
+                                >
+                                  重新编辑
+                                </button>
+                              </>
+                            ) : null}
+                          </p>
+                        </div>
+                      );
+                    }
+
+                    // 站长/超管：单气泡呈现撤回原文（可读，非双气泡）
+                    if (recalled && oversee && m.content) {
+                      return (
+                        <div
+                          key={m.id}
+                          ref={(node) => {
+                            if (node) msgRefs.current.set(m.id, node);
+                            else msgRefs.current.delete(m.id);
+                          }}
+                          className={`flex gap-2.5 ${mine ? "flex-row-reverse" : ""}`}
+                        >
+                          <div className="w-8 shrink-0">
+                            <Avatar
+                              name={m.sender.nickname || m.sender.username}
+                              src={m.sender.avatar || undefined}
+                              size={32}
+                            />
+                          </div>
+                          <div
+                            className={`flex flex-col min-w-0 max-w-[78%] ${
+                              mine ? "items-end" : "items-start"
+                            }`}
+                          >
+                            <div className="flex items-center gap-2 mb-1">
+                              {!isDirect && m.sender_id === ownerId && (
+                                <Crown size={11} style={{ color: "var(--gold)" }} />
+                              )}
+                              <span
+                                className="text-[12px] font-semibold truncate"
+                                style={{ color: "var(--ink-2)" }}
+                              >
+                                {m.sender.nickname}
+                              </span>
+                              <span className="meta text-[10.5px]">
+                                {formatTime(m.created_at)}
+                              </span>
+                            </div>
+                            <div
+                              className="px-3.5 py-2.5 rounded-2xl text-[14px] leading-[1.55] break-words whitespace-pre-wrap select-text w-full"
+                              style={{
+                                background: "var(--panel-2)",
+                                border:
+                                  "1px solid color-mix(in srgb, var(--line) 80%, var(--ink-3))",
+                                color: "var(--ink)",
+                                borderBottomRightRadius: mine ? 4 : undefined,
+                                borderBottomLeftRadius: mine ? undefined : 4,
+                                opacity: 0.92,
+                              }}
+                            >
+                              <div
+                                className="inline-flex items-center gap-1 mb-1.5 text-[11px] font-semibold"
+                                style={{ color: "var(--ink-3)" }}
+                              >
+                                <Undo2 size={11} strokeWidth={2.4} />
+                                已撤回
+                              </div>
+                              <div style={{ color: "var(--ink-2)" }}>
+                                {highlightMentions(m.content, members)}
+                              </div>
+                            </div>
+                          </div>
+                        </div>
+                      );
+                    }
+
                 return (
                   <div
                     key={m.id}
@@ -964,17 +1239,6 @@ export default function ChatRoomClient({
                           </span>
                         </div>
                       )}
-                      {recalled ? (
-                        <div
-                          className="px-3 py-2 rounded-xl text-[13px] italic"
-                          style={{
-                            background: "var(--panel-2)",
-                            color: "var(--ink-3)",
-                          }}
-                        >
-                          {recallLabel(m, meId)}
-                        </div>
-                      ) : (
                       <div
                         className="px-3.5 py-2.5 rounded-2xl text-[14px] leading-[1.55] break-words whitespace-pre-wrap select-text"
                         onContextMenu={(e) => {
@@ -1025,7 +1289,6 @@ export default function ChatRoomClient({
                         )}
                         {highlightMentions(m.content, members)}
                       </div>
-                      )}
                     </div>
                   </div>
                 );

frontend/app/u/[id]/ProfileForm.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState } from "react";
+import { useCallback, useState } from "react";
 import { useRouter } from "next/navigation";
 import { Check } from "lucide-react";
 import { apiUpdateProfile, type User } from "@/lib/api";
@@ -23,6 +23,34 @@ export default function ProfileForm({ user }: ProfileFormProps) {
   const [submitting, setSubmitting] = useState(false);
   const [error, setError] = useState("");
   const [success, setSuccess] = useState("");
+  const [avatarDragOver, setAvatarDragOver] = useState(false);
+  const [incomingAvatarFile, setIncomingAvatarFile] = useState<File | null>(null);
+
+  const clearIncomingAvatar = useCallback(() => setIncomingAvatarFile(null), []);
+
+  const handleAvatarDragOver = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    if (e.dataTransfer.types.includes("Files")) setAvatarDragOver(true);
+  };
+
+  const handleAvatarDragLeave = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    // 仅在离开整块卡片时取消高亮（避免子元素冒泡闪烁）
+    const related = e.relatedTarget as Node | null;
+    if (related && e.currentTarget.contains(related)) return;
+    setAvatarDragOver(false);
+  };
+
+  const handleAvatarDrop = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setAvatarDragOver(false);
+    const file = e.dataTransfer.files?.[0];
+    if (!file) return;
+    setIncomingAvatarFile(file);
+  };
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault();
@@ -72,20 +100,32 @@ export default function ProfileForm({ user }: ProfileFormProps) {
       )}
       {error && <div className="alert-error" role="alert">{error}</div>}
 
-      {/* 头像：点击上传/裁剪，或从历史图片中选择 */}
+      {/* 头像：点击上传/裁剪，或拖放图片到本区域 */}
       <div
-        className="flex items-center gap-4 p-4 rounded-xl"
-        style={{ background: "var(--panel-2)", border: "1px solid var(--line)" }}
+        className="flex items-center gap-4 p-4 rounded-xl transition-colors"
+        style={{
+          background: avatarDragOver
+            ? "color-mix(in srgb, var(--accent) 12%, var(--panel-2))"
+            : "var(--panel-2)",
+          border: `1px solid ${avatarDragOver ? "var(--accent)" : "var(--line)"}`,
+        }}
+        onDragOver={handleAvatarDragOver}
+        onDragLeave={handleAvatarDragLeave}
+        onDrop={handleAvatarDrop}
       >
         <AvatarPicker
           name={nickname || user.username}
           src={user.avatar || ""}
           size={56}
+          incomingFile={incomingAvatarFile}
+          onIncomingConsumed={clearIncomingAvatar}
         />
         <div className="flex-1 min-w-0">
           <p className="text-[13.5px] font-bold" style={{ color: "var(--ink)" }}>头像</p>
           <p className="text-[12px] mt-1" style={{ color: "var(--ink-3)" }}>
-            点击头像上传新图片，支持拖动裁剪；统一转为 WebP，裁剪后不超过 2MB
+            {avatarDragOver
+              ? "松开即可上传并裁剪"
+              : "点击头像或拖放图片到此处；支持拖动裁剪，统一转为 WebP，裁剪后不超过 2MB"}
           </p>
         </div>
       </div>

frontend/app/u/[id]/UserProfileContent.tsx

@@ -28,7 +28,7 @@ export default function UserProfileContent({
     <div>
       {tab === "posts" ? (
         <div>
-          {profile.posts.length > 0 ? (
+          {Array.isArray(profile.posts) && profile.posts.length > 0 ? (
             <div className="panel overflow-hidden p-0">
               {profile.posts.map((post, i) => (
                 <Link
@@ -83,10 +83,10 @@ export default function UserProfileContent({
           <p className="meta mt-1.5 mb-4">网络异常，请稍后重试</p>
           <Link href={`/u/${userId}?tab=comments`} className="btn btn-line btn-sm">重新加载</Link>
         </div>
-      ) : commentData && commentData.comments.length > 0 ? (
+      ) : commentData && (commentData.comments?.length ?? 0) > 0 ? (
         <div>
           <div className="panel overflow-hidden p-0">
-            {commentData.comments.map((c, i) => (
+            {(commentData.comments ?? []).map((c, i) => (
               <Link
                 key={c.id}
                 href={`/post/${c.post_id}`}

frontend/components/AvatarCropModal.tsx

@@ -18,13 +18,17 @@ interface AvatarCropModalProps {
   currentAvatar: string;
   /** 头像变更（新 URL）或被删除（空串）时触发 */
   onChanged: (avatar: string) => void;
+  /** 外部拖入的图片：打开后直接进入裁剪 */
+  seedFile?: File | null;
+  /** 已消费 seedFile（成功或校验失败后均调用，便于父级清空） */
+  onSeedConsumed?: () => void;
 }
 
 // 源文件大小保护（防止手机相册原图撑爆浏览器内存；最终限制以裁剪后 2MB 为准）
 const SOURCE_MAX_BYTES = 15 * 1024 * 1024;
 
 export default function AvatarCropModal({
-  open, onClose, currentAvatar, onChanged,
+  open, onClose, currentAvatar, onChanged, seedFile, onSeedConsumed,
 }: AvatarCropModalProps) {
   const [media, setMedia] = useState<MediaAttachment[]>([]);
   const [imageSrc, setImageSrc] = useState<string | null>(null); // blob: 或同源 /uploads URL
@@ -37,6 +41,7 @@ export default function AvatarCropModal({
   const [confirmDeleteId, setConfirmDeleteId] = useState<number | null>(null);
   // 正在"直接选用"的历史头像 id（区别于裁剪上传，走 PUT /avatar/use）
   const [usingId, setUsingId] = useState<number | null>(null);
+  const [dragOver, setDragOver] = useState(false);
   const fileInputRef = useRef<HTMLInputElement>(null);
   const confirmTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
 
@@ -64,6 +69,7 @@ export default function AvatarCropModal({
       setBusy(false);
       setConfirmDeleteId(null);
       setUsingId(null);
+      setDragOver(false);
     }
   }, [open]);
 
@@ -85,13 +91,36 @@ export default function AvatarCropModal({
     setPixelCrop(areaPixels);
   }, []);
 
-  const enterCrop = (src: string, isBlob: boolean) => {
+  const enterCrop = useCallback((src: string, isBlob: boolean) => {
     setError("");
-    setImageSrc(src);
+    setImageSrc((prev) => {
+      if (prev && prev.startsWith("blob:")) URL.revokeObjectURL(prev);
+      return src;
+    });
     setSrcIsBlob(isBlob);
     setCrop({ x: 0, y: 0 });
     setZoom(1);
-  };
+  }, []);
+
+  /** 校验并进入裁剪；返回错误文案，成功返回空串 */
+  const acceptImageFile = useCallback((file: File): string => {
+    if (!file.type.startsWith("image/")) {
+      return "请选择图片文件（JPG / PNG / GIF / WebP）";
+    }
+    if (file.size > SOURCE_MAX_BYTES) {
+      return "原图不能超过 15MB，裁剪后的头像需在 2MB 以内";
+    }
+    enterCrop(URL.createObjectURL(file), true);
+    return "";
+  }, [enterCrop]);
+
+  // 外部拖入：弹窗打开后立刻进入裁剪
+  useEffect(() => {
+    if (!open || !seedFile) return;
+    const errMsg = acceptImageFile(seedFile);
+    if (errMsg) setError(errMsg);
+    onSeedConsumed?.();
+  }, [open, seedFile, acceptImageFile, onSeedConsumed]);
 
   /**
    * 点击媒体库图片：
@@ -128,15 +157,31 @@ export default function AvatarCropModal({
     const file = e.target.files?.[0];
     e.target.value = "";
     if (!file) return;
-    if (!file.type.startsWith("image/")) {
-      setError("请选择图片文件（JPG / PNG / GIF / WebP）");
-      return;
-    }
-    if (file.size > SOURCE_MAX_BYTES) {
-      setError("原图不能超过 15MB，裁剪后的头像需在 2MB 以内");
-      return;
-    }
-    enterCrop(URL.createObjectURL(file), true);
+    const errMsg = acceptImageFile(file);
+    if (errMsg) setError(errMsg);
+  };
+
+  const onDropZoneDragOver = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    if (!busy) setDragOver(true);
+  };
+
+  const onDropZoneDragLeave = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setDragOver(false);
+  };
+
+  const onDropZoneDrop = (e: React.DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setDragOver(false);
+    if (busy) return;
+    const file = e.dataTransfer.files?.[0];
+    if (!file) return;
+    const errMsg = acceptImageFile(file);
+    if (errMsg) setError(errMsg);
   };
 
   const backToLibrary = () => {
@@ -233,14 +278,19 @@ export default function AvatarCropModal({
 
         {!imageSrc ? (
           <>
-            {/* 选择新图片 */}
+            {/* 选择新图片：点击或拖放 */}
             <button
               type="button"
               onClick={() => fileInputRef.current?.click()}
+              onDragOver={onDropZoneDragOver}
+              onDragLeave={onDropZoneDragLeave}
+              onDrop={onDropZoneDrop}
               className="w-full flex flex-col items-center justify-center gap-2 rounded-xl py-7 px-4 text-center transition-colors hover:border-[var(--accent)]"
               style={{
-                border: "1.5px dashed var(--line-2)",
-                background: "var(--panel-2)",
+                border: `1.5px dashed ${dragOver ? "var(--accent)" : "var(--line-2)"}`,
+                background: dragOver
+                  ? "color-mix(in srgb, var(--accent) 10%, var(--panel-2))"
+                  : "var(--panel-2)",
                 color: "var(--ink-2)",
               }}
             >
@@ -251,7 +301,7 @@ export default function AvatarCropModal({
                 <UploadCloud size={20} />
               </span>
               <span className="text-[13.5px] font-bold" style={{ color: "var(--ink)" }}>
-                点击选择图片
+                {dragOver ? "松开即可开始裁剪" : "点击选择或拖放图片"}
               </span>
               <span className="text-[12px] leading-relaxed" style={{ color: "var(--ink-3)" }}>
                 支持 JPG / PNG / GIF / WebP，裁剪后统一转为 WebP，大小不超过 2MB

frontend/components/AvatarPicker.tsx

@@ -11,6 +11,9 @@ interface AvatarPickerProps {
   name: string;
   src: string;
   size?: number;
+  /** 外部拖入的文件：非空时打开裁剪弹窗并进入裁剪 */
+  incomingFile?: File | null;
+  onIncomingConsumed?: () => void;
 }
 
 /**
@@ -23,10 +26,13 @@ interface AvatarPickerProps {
  * 另外监听广播，使页面上若存在多个 picker 实例也保持一致；
  * 并随 src prop（SSR 校正）同步，避免 useState 初始值造成数据漂移。
  */
-export default function AvatarPicker({ name, src, size = 56 }: AvatarPickerProps) {
+export default function AvatarPicker({
+  name, src, size = 56, incomingFile, onIncomingConsumed,
+}: AvatarPickerProps) {
   const router = useRouter();
   const [open, setOpen] = useState(false);
   const [current, setCurrent] = useState(src);
+  const [seedFile, setSeedFile] = useState<File | null>(null);
 
   // SSR props 校正（router.refresh 后服务端数据回流）
   useEffect(() => setCurrent(src), [src]);
@@ -36,13 +42,26 @@ export default function AvatarPicker({ name, src, size = 56 }: AvatarPickerProps
     if (typeof patch.avatar === "string") setCurrent(patch.avatar);
   }), []);
 
+  // 外层拖入：打开弹窗并交给裁剪流程
+  useEffect(() => {
+    if (!incomingFile) return;
+    setSeedFile(incomingFile);
+    setOpen(true);
+  }, [incomingFile]);
+
   const handleChanged = (avatar: string) => {
     setCurrent(avatar);
     setOpen(false);
+    setSeedFile(null);
     emitUserUpdate({ avatar });
     router.refresh();
   };
 
+  const handleSeedConsumed = () => {
+    setSeedFile(null);
+    onIncomingConsumed?.();
+  };
+
   return (
     <>
       <button
@@ -66,9 +85,14 @@ export default function AvatarPicker({ name, src, size = 56 }: AvatarPickerProps
 
       <AvatarCropModal
         open={open}
-        onClose={() => setOpen(false)}
+        onClose={() => {
+          setOpen(false);
+          setSeedFile(null);
+        }}
         currentAvatar={current}
         onChanged={handleChanged}
+        seedFile={seedFile}
+        onSeedConsumed={handleSeedConsumed}
       />
     </>
   );

frontend/components/Header.tsx

@@ -27,6 +27,7 @@ import { isStaff } from "@/lib/roles";
 import { onUserUpdate, onForceLogout } from "@/lib/userEvents";
 import { realtime, RT_CHAT_UNREAD } from "@/lib/realtime";
 import type { RtChatUnreadData } from "@/lib/realtime";
+import { onDocumentVisible } from "@/lib/visibilityReconcile";
 import NotificationBell from "./NotificationBell";
 import Avatar from "./Avatar";
 
@@ -112,29 +113,26 @@ export default function Header({
     return off;
   }, [user, pathname]);
 
-  // 会话内已读后主动对账（ChatRoomClient 派发）
+  // 会话内已读 / 回前台：合并对账（短时间多次 markRead 只打一次 summary）
   useEffect(() => {
     if (!user) return;
-    const onSync = () => {
+    let debounceTimer: ReturnType<typeof setTimeout> | null = null;
+    const pullSummary = () => {
       apiChatUnreadSummary()
         .then((res) => setChatUnread(res.total || 0))
         .catch(() => {});
     };
+    const onSync = () => {
+      if (debounceTimer) clearTimeout(debounceTimer);
+      debounceTimer = setTimeout(pullSummary, 250);
+    };
     window.addEventListener("j13-chat-unread-sync", onSync);
-    return () => window.removeEventListener("j13-chat-unread-sync", onSync);
-  }, [user]);
-
-  // 切回标签页时重新对账未读
-  useEffect(() => {
-    if (!user) return;
-    const onVisible = () => {
-      if (document.visibilityState !== "visible") return;
-      apiChatUnreadSummary()
-        .then((res) => setChatUnread(res.total || 0))
-        .catch(() => {});
+    const offVisible = onDocumentVisible(pullSummary);
+    return () => {
+      if (debounceTimer) clearTimeout(debounceTimer);
+      window.removeEventListener("j13-chat-unread-sync", onSync);
+      offVisible();
     };
-    document.addEventListener("visibilitychange", onVisible);
-    return () => document.removeEventListener("visibilitychange", onVisible);
   }, [user]);
 
   const handleSearch = (e: React.FormEvent) => {

frontend/components/NotificationBell.tsx

@@ -12,17 +12,21 @@ import {
   type NotificationItem,
 } from "@/lib/api";
 import { realtime, RT_NOTIFICATION_NEW } from "@/lib/realtime";
+import { onDocumentVisible } from "@/lib/visibilityReconcile";
 
 export default function NotificationBell({ initialUnread = 0 }: { initialUnread?: number }) {
   const router = useRouter();
   const [open, setOpen] = useState(false);
-  // SSR 直出未读数，红点不再挂载后才弹出；挂载后轮询自然校正
+  // SSR 直出未读数，红点不再挂载后才弹出；WS/回前台校准
   const [unread, setUnread] = useState(initialUnread);
   const [notifications, setNotifications] = useState<NotificationItem[]>([]);
   const [loading, setLoading] = useState(false);
   const dropdownRef = useRef<HTMLDivElement>(null);
+  const openRef = useRef(open);
+  openRef.current = open;
+  const loadNotificationsRef = useRef<() => void>(() => {});
 
-  // 未读数：WS 推送后拉取校准；回前台再对账（无定时轮询）
+  // 未读数：首屏用 SSR；WS 推送 / 回前台校准（无定时轮询；open 变化不重订）
   useEffect(() => {
     let cancelled = false;
     let debounceTimer: ReturnType<typeof setTimeout> | null = null;
@@ -40,22 +44,18 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
       debounceTimer = setTimeout(fetchCount, 200);
     };
 
-    fetchCount();
     const off = realtime.on(RT_NOTIFICATION_NEW, () => {
       fetchCountDebounced();
-      if (open) loadNotifications();
+      if (openRef.current) loadNotificationsRef.current();
     });
-    const onVisible = () => {
-      if (document.visibilityState === "visible") fetchCount();
-    };
-    document.addEventListener("visibilitychange", onVisible);
+    const offVisible = onDocumentVisible(fetchCount);
     return () => {
       cancelled = true;
       if (debounceTimer) clearTimeout(debounceTimer);
       off();
-      document.removeEventListener("visibilitychange", onVisible);
+      offVisible();
     };
-  }, [open]);
+  }, []);
 
   // 点击外部关闭下拉
   useEffect(() => {
@@ -78,6 +78,9 @@ export default function NotificationBell({ initialUnread = 0 }: { initialUnread?
     }
     setLoading(false);
   };
+  loadNotificationsRef.current = () => {
+    void loadNotifications();
+  };
 
   const handleToggle = () => {
     const next = !open;

frontend/components/ThemeSync.tsx

@@ -5,13 +5,17 @@ import { usePathname } from "next/navigation";
 import { apiGetSettings } from "@/lib/api";
 import { applyAccentTheme } from "@/lib/theme";
 import { realtime, RT_SETTINGS_CHANGED, type RtSettingsData } from "@/lib/realtime";
+import {
+  VISIBLE_RECONCILE_GAP_MS,
+  onDocumentVisible,
+} from "@/lib/visibilityReconcile";
 
 // 站点主题色同步器：
 // 主题色由管理员在后台修改后，其他用户已打开的标签页不会因软导航重新执行根布局
-// SSR，本组件通过 WS 推送 + 标签页重新可见/获焦时探测公开设置，发现变化即热替换
+// SSR，本组件通过 WS 推送 + 标签页重新可见时探测公开设置，发现变化即热替换
 // accent CSS 变量（复用 lib/theme 的运行时 style 节点），无需 F5 即可换肤。
 // 焦点/可见性事件可能短时间连续触发，限制实际请求间隔
-const MIN_FETCH_GAP_MS = 10_000;
+const MIN_FETCH_GAP_MS = VISIBLE_RECONCILE_GAP_MS;
 
 export default function ThemeSync({ initialAccent }: { initialAccent: string }) {
   const pathname = usePathname();
@@ -56,19 +60,15 @@ export default function ThemeSync({ initialAccent }: { initialAccent: string })
       if (data) apply((data.accent || "").trim().toLowerCase());
     });
 
-    const onActive = () => {
-      if (document.visibilityState === "visible") void sync();
-    };
-    document.addEventListener("visibilitychange", onActive);
-    window.addEventListener("focus", onActive);
+    // 仅 visibility：window focus 与 visibility 常连发，统一走限频即可
+    const offVisible = onDocumentVisible(() => void sync(), MIN_FETCH_GAP_MS);
     // 离开外观页等 pathname 变化时立刻对齐一次（受 MIN_FETCH_GAP 限频）
     void sync();
 
     return () => {
       cancelled = true;
       offPush();
-      document.removeEventListener("visibilitychange", onActive);
-      window.removeEventListener("focus", onActive);
+      offVisible();
     };
   }, [pathname]);
 

frontend/lib/api.ts

@@ -460,7 +460,9 @@ export async function fetchUserComments(id: string, page = 1): Promise<UserComme
   const res = await fetch(`${API_BASE}/api/users/${id}/comments?${params}`, ssrInit());
   if (res.status === 404) throw new Error("用户不存在");
   if (!res.ok) throw new Error("获取评论失败");
-  return res.json();
+  const data = (await res.json()) as UserCommentsResponse;
+  // Go 空切片曾序列化为 null；统一归一成 []，避免 SSR 读 .length 崩
+  return { ...data, comments: data.comments ?? [] };
 }
 
 // SSR 直出通知列表（仅登录用户；401 由页面层转为登录引导）
@@ -1225,6 +1227,8 @@ export interface ChatMessage {
   recalled_at?: string | null;
   recalled_by?: number;
   sender: User;
+  /** 撤回操作者（已撤回时后端 Preload；本人撤回时通常等于 sender） */
+  recaller?: User | null;
 }
 
 // 单群未读明细

frontend/lib/realtime.ts

@@ -72,6 +72,13 @@ export interface RtChatRecalledData {
   sender_id?: number;
   recalled_by: number;
   recalled_at?: string;
+  recaller?: {
+    id: number;
+    username: string;
+    nickname: string;
+    avatar: string;
+    role?: string;
+  };
 }
 
 // 未读增量（推送给未在房内订阅的成员，用于 Header / 会话列表角标）

frontend/lib/roles.ts

@@ -86,6 +86,11 @@ export interface RoleMeta {
   /** 主色使用的 CSS token 名（RoleBadge 取 var(--token)） */
   colorToken: string;
   softToken: string;
+  /**
+   * 授权弹窗用的职责说明（站长不出现在可授权列表）。
+   * 只描述该角色「有什么」，最终权限以后端为准。
+   */
+  grantDesc?: string;
 }
 
 // 各管理角色的图标与配色集中配置；站长固定使用皇冠站长标识
@@ -96,6 +101,8 @@ export const ROLE_META: Record<RoleKey, RoleMeta> = {
     icon: "crown",
     colorToken: "--gold",
     softToken: "--gold-soft",
+    grantDesc:
+      "站点所有者：全部后台能力、群聊监管、用户内容档案；身份不可授予或降级。",
   },
   [ROLES.SUPER_ADMIN]: {
     key: ROLES.SUPER_ADMIN,
@@ -103,6 +110,8 @@ export const ROLE_META: Record<RoleKey, RoleMeta> = {
     icon: "shield-star",
     colorToken: "--accent",
     softToken: "--accent-soft",
+    grantDesc:
+      "用户与角色管理、封禁、外观主题、公告；全站内容审核与置顶/加精；群聊监管（可见全部会话、可撤回任意消息）。不可动站长账号，亦无站长专属的用户内容档案。",
   },
   [ROLES.ADMIN]: {
     key: ROLES.ADMIN,
@@ -110,6 +119,8 @@ export const ROLE_META: Record<RoleKey, RoleMeta> = {
     icon: "shield",
     colorToken: "--accent",
     softToken: "--accent-soft",
+    grantDesc:
+      "公告管理；全站帖子/评论审核；前台置顶与加精。不含用户权限、外观设置与群聊监管旁路。",
   },
   [ROLES.BOARD_ADMIN]: {
     key: ROLES.BOARD_ADMIN,
@@ -117,6 +128,8 @@ export const ROLE_META: Record<RoleKey, RoleMeta> = {
     icon: "shield-board",
     colorToken: "--accent",
     softToken: "--accent-soft",
+    grantDesc:
+      "仅审核并管理被授权板块内的帖子与评论（含删除违规内容）。无公告、置顶/加精、用户管理与外观设置；须至少勾选一个板块。",
   },
   [ROLES.USER]: {
     key: ROLES.USER,
@@ -124,6 +137,8 @@ export const ROLE_META: Record<RoleKey, RoleMeta> = {
     icon: "user",
     colorToken: "--ink-3",
     softToken: "--panel-2",
+    grantDesc:
+      "无任何后台入口。可发帖、评论、私信等；新帖与评论按站点规则进入审核。降级为普通用户时会清空板块授权。",
   },
 };
 

frontend/lib/visibilityReconcile.ts

@@ -0,0 +1,31 @@
+/**
+ * 回前台 HTTP 对账限频。
+ *
+ * 多组件（Header / 通知铃 / 聊天侧栏 / ThemeSync / 管理后台）都会在
+ * visibilitychange 时拉一次状态；短时间切标签会叠加请求。
+ * 本工具保证「同一订阅在 minGapMs 内最多执行一次」。
+ */
+
+/** 与 ThemeSync 对齐：10s 内不重复对账 */
+export const VISIBLE_RECONCILE_GAP_MS = 10_000;
+
+/**
+ * 监听 document 重新可见；限频后调用 run。
+ * 返回取消订阅函数。
+ */
+export function onDocumentVisible(
+  run: () => void,
+  minGapMs: number = VISIBLE_RECONCILE_GAP_MS
+): () => void {
+  if (typeof document === "undefined") return () => {};
+  let lastAt = 0;
+  const onVisible = () => {
+    if (document.visibilityState !== "visible") return;
+    const now = Date.now();
+    if (now - lastAt < minGapMs) return;
+    lastAt = now;
+    run();
+  };
+  document.addEventListener("visibilitychange", onVisible);
+  return () => document.removeEventListener("visibilitychange", onVisible);
+}