feat(me): add ActivityTimeline and NotificationList components

Add ActivityTimeline component with user activity display and
NotificationList for user notifications.

src/app/me/components/ActivityTimeline.tsx

@@ -1,3 +1,4 @@
+import { memo } from "react";
 import { formatDistanceToNow } from "date-fns";
 import {
   History,
@@ -35,7 +36,7 @@ const ICON_MAP: Record<string, React.ComponentType<{ className?: string; "aria-h
   avatar_upload: ImageIcon,
 };
 
-export function ActivityTimeline({ items, isLoading }: ActivityTimelineProps) {
+export const ActivityTimeline = memo(function ActivityTimeline({ items, isLoading }: ActivityTimelineProps) {
   if (isLoading) {
     return (
       <div className="flow-root">
@@ -93,4 +94,4 @@ export function ActivityTimeline({ items, isLoading }: ActivityTimelineProps) {
       </ul>
     </div>
   );
-}
+});

src/app/me/components/MeSidebar.tsx

@@ -7,6 +7,7 @@ import {
     Star,
     Users,
     MessageSquare,
+    Bell,
     PanelLeftClose
 } from "lucide-react";
 import type { ComponentType } from "react";
@@ -47,6 +48,11 @@ const ME_NAV_ITEMS: NavItem[] = [
         name: "Chat",
         icon: MessageSquare,
     },
+    {
+        path: "/me/notify",
+        name: "Notifications",
+        icon: Bell,
+    },
     {
         path: "/me/stars",
         name: "Stars",

src/app/me/components/NotificationList.tsx

@@ -0,0 +1,172 @@
+import { useState } from "react";
+import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
+import { notificationList, notificationMarkRead, notificationMarkAllRead } from "@/client/api";
+import type { NotificationResponse } from "@/client/model";
+import { Bell, CheckCheck, Mail, MailOpen, Loader2 } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+const NOTIFICATION_TYPE_LABELS: Record<string, string> = {
+  mention: "Mention",
+  invitation: "Invitation",
+  role_change: "Role Change",
+  room_created: "Room Created",
+  room_deleted: "Room Deleted",
+  system_announcement: "Announcement",
+  project_invitation: "Project Invitation",
+};
+
+function NotificationItem({ notification }: { notification: NotificationResponse }) {
+  const queryClient = useQueryClient();
+  const markReadMutation = useMutation({
+    mutationFn: () => notificationMarkRead(notification.id),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["notificationList"] });
+    },
+  });
+
+  return (
+    <div
+      className="p-4 rounded-xl border-[0.5px] transition-all"
+      style={{
+        backgroundColor: notification.is_read ? "var(--surface-secondary)" : "var(--surface-tertiary)",
+        borderColor: "var(--border-subtle)",
+        opacity: notification.is_read ? 0.75 : 1,
+      }}
+      onClick={() => {
+        if (!notification.is_read) {
+          markReadMutation.mutate();
+        }
+      }}
+    >
+      <div className="flex items-start gap-3">
+        <div
+          className="mt-0.5 w-8 h-8 rounded-lg flex items-center justify-center shrink-0"
+          style={{ backgroundColor: notification.is_read ? "var(--surface-ground)" : "var(--accent)" }}
+        >
+          {notification.is_read ? (
+            <MailOpen className="w-4 h-4" style={{ color: "var(--text-muted)" }} />
+          ) : (
+            <Mail className="w-4 h-4 text-white" />
+          )}
+        </div>
+        <div className="flex-1 min-w-0">
+          <div className="flex items-center gap-2 mb-0.5">
+            <span className="text-[12px] font-medium" style={{ color: "var(--text-primary)" }}>
+              {NOTIFICATION_TYPE_LABELS[notification.notification_type] || notification.notification_type}
+            </span>
+            {!notification.is_read && (
+              <span className="w-1.5 h-1.5 rounded-full shrink-0" style={{ backgroundColor: "var(--accent)" }} />
+            )}
+            <span className="text-[11px] ml-auto shrink-0" style={{ color: "var(--text-tertiary)" }}>
+              {new Date(notification.created_at).toLocaleString()}
+            </span>
+          </div>
+          <p className="text-[13px] font-medium truncate" style={{ color: "var(--text-primary)" }}>
+            {notification.title}
+          </p>
+          {notification.content && (
+            <p className="text-[12px] mt-1 line-clamp-2" style={{ color: "var(--text-secondary)" }}>
+              {notification.content}
+            </p>
+          )}
+          {(notification.room || notification.project) && (
+            <div className="flex items-center gap-2 mt-2 text-[11px]" style={{ color: "var(--text-tertiary)" }}>
+              {notification.project && <span>Project: {notification.project}</span>}
+              {notification.room && <span>Room: {notification.room}</span>}
+            </div>
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export function NotificationList() {
+  const queryClient = useQueryClient();
+  const [onlyUnread, setOnlyUnread] = useState(false);
+
+  const { data, isLoading, isError } = useQuery({
+    queryKey: ["notificationList", onlyUnread],
+    queryFn: () => notificationList({ only_unread: onlyUnread || undefined, limit: 50 }),
+  });
+
+  const markAllReadMutation = useMutation({
+    mutationFn: notificationMarkAllRead,
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["notificationList"] });
+    },
+  });
+
+  if (isLoading) {
+    return (
+      <div className="flex justify-center py-12">
+        <Loader2 className="w-6 h-6 animate-spin" style={{ color: "var(--accent)" }} />
+      </div>
+    );
+  }
+
+  if (isError) {
+    return (
+      <div className="text-center py-12" style={{ color: "var(--text-muted)" }}>
+        <p>Failed to load notifications</p>
+      </div>
+    );
+  }
+
+  const notifications = data?.data?.data?.notifications ?? [];
+  const unreadCount = data?.data?.data?.unread_count ?? 0;
+
+  return (
+    <div className="space-y-4">
+      {/* Toolbar */}
+      <div className="flex items-center justify-between">
+        <div className="flex items-center gap-2">
+          <Bell className="w-4 h-4" style={{ color: "var(--text-tertiary)" }} />
+          <span className="text-[13px]" style={{ color: "var(--text-secondary)" }}>
+            {unreadCount > 0 ? `${unreadCount} unread` : "All read"}
+          </span>
+        </div>
+        <div className="flex items-center gap-2">
+          <button
+            className="text-[12px] px-2.5 py-1 rounded-md transition-colors"
+            style={{
+              color: onlyUnread ? "var(--accent)" : "var(--text-secondary)",
+              backgroundColor: onlyUnread ? "color-mix(in srgb, var(--accent) 10%, transparent)" : "transparent",
+            }}
+            onClick={() => setOnlyUnread(!onlyUnread)}
+          >
+            Unread only
+          </button>
+          {unreadCount > 0 && (
+            <Button
+              variant="ghost"
+              size="sm"
+              className="text-[12px] h-7 gap-1"
+              onClick={() => markAllReadMutation.mutate()}
+              disabled={markAllReadMutation.isPending}
+            >
+              <CheckCheck className="w-3.5 h-3.5" />
+              Mark all read
+            </Button>
+          )}
+        </div>
+      </div>
+
+      {notifications.length === 0 ? (
+        <div className="text-center py-16" style={{ color: "var(--text-muted)" }}>
+          <Bell className="w-10 h-10 mx-auto mb-3" style={{ color: "var(--text-tertiary)" }} />
+          <p className="text-[14px] font-medium">No notifications</p>
+          <p className="text-[12px] mt-1">
+            {onlyUnread ? "No unread notifications" : "You're all caught up"}
+          </p>
+        </div>
+      ) : (
+        <div className="space-y-2">
+          {notifications.map((n) => (
+            <NotificationItem key={n.id} notification={n} />
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}