refactor(ui): replace native window.confirm with ConfirmDialog for task deletion

Unify confirmation UX — task-list and board-container now use the shared
ConfirmDialog component instead of browser-native window.confirm().

ui/web/src/pages/teams/board/board-container.tsx

@@ -9,6 +9,7 @@ import { BoardToolbar } from "./board-toolbar";
 import { KanbanBoard } from "./kanban-board";
 import { TaskDetailDialog } from "../task-sections/task-detail-dialog";
 import { TaskList } from "../task-sections";
+import { ConfirmDialog } from "@/components/shared/confirm-dialog";
 import type {
   TeamTaskData, TeamTaskComment, TeamTaskEvent, TeamTaskAttachment,
   TeamMemberData, ScopeEntry,
@@ -72,6 +73,8 @@ export const BoardContainer = memo(function BoardContainer({
   const [statusFilter, setStatusFilter] = useState<StatusFilter>("all");
   const [selectedScope, setSelectedScope] = useState<ScopeEntry | null>(null);
   const [selectedTask, setSelectedTask] = useState<TeamTaskData | null>(null);
+  const [deleteTargetId, setDeleteTargetId] = useState<string | null>(null);
+  const [singleDeleting, setSingleDeleting] = useState(false);
 
   // Lookups for name resolution
   const taskLookup = useMemo(() => buildTaskLookup(tasks), [tasks]);
@@ -227,16 +230,24 @@ export const BoardContainer = memo(function BoardContainer({
 
   const deleteTaskRef = useRef(deleteTask);
   deleteTaskRef.current = deleteTask;
-  const handleDeleteTask = useCallback(async (taskId: string) => {
+  const handleDeleteTask = useCallback((taskId: string) => {
     if (!deleteTaskRef.current) return;
-    if (!window.confirm(t("tasks.deleteConfirm"))) return;
+    setDeleteTargetId(taskId);
+  }, []);
+
+  const confirmDeleteTask = useCallback(async () => {
+    if (!deleteTaskRef.current || !deleteTargetId) return;
+    setSingleDeleting(true);
     try {
-      await deleteTaskRef.current(teamId, taskId);
+      await deleteTaskRef.current(teamId, deleteTargetId);
       toast.success(t("toast.taskDeleted"));
+      setDeleteTargetId(null);
     } catch {
       toast.error(t("toast.failedDeleteTask"));
+    } finally {
+      setSingleDeleting(false);
     }
-  }, [teamId, t]);
+  }, [teamId, deleteTargetId, t]);
 
   return (
     <div className="flex flex-1 flex-col gap-3 overflow-hidden p-3 sm:p-4">
@@ -280,6 +291,17 @@ export const BoardContainer = memo(function BoardContainer({
         )}
       </div>
 
+      <ConfirmDialog
+        open={!!deleteTargetId}
+        onOpenChange={(v) => !v && setDeleteTargetId(null)}
+        title={t("tasks.delete")}
+        description={t("tasks.deleteConfirm")}
+        confirmLabel={t("tasks.delete")}
+        variant="destructive"
+        onConfirm={confirmDeleteTask}
+        loading={singleDeleting}
+      />
+
       {selectedTask && (
         <TaskDetailDialog
           task={selectedTask}

ui/web/src/pages/teams/task-sections/task-list.tsx

@@ -3,6 +3,7 @@ import { ClipboardList, Trash2 } from "lucide-react";
 import { Badge } from "@/components/ui/badge";
 import { Button } from "@/components/ui/button";
 import { useTranslation } from "react-i18next";
+import { ConfirmDialog } from "@/components/shared/confirm-dialog";
 import { ConfirmDeleteDialog } from "@/components/shared/confirm-delete-dialog";
 import { Pagination } from "@/components/shared/pagination";
 import { usePagination } from "@/hooks/use-pagination";
@@ -36,6 +37,8 @@ export function TaskList({
   const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set());
   const [confirmOpen, setConfirmOpen] = useState(false);
   const [deleting, setDeleting] = useState(false);
+  const [deleteTargetId, setDeleteTargetId] = useState<string | null>(null);
+  const [singleDeleting, setSingleDeleting] = useState(false);
   const taskLookup = useMemo(() => buildTaskLookup(tasks), [tasks]);
   const memberLookup = useMemo(() => buildMemberLookup(members), [members]);
   const { pageItems, pagination, setPage, setPageSize } = usePagination(tasks, { defaultPageSize: 20 });
@@ -107,10 +110,20 @@ export function TaskList({
   const handleDelete = (e: React.MouseEvent, taskId: string) => {
     e.stopPropagation();
     if (!deleteTask) return;
-    if (!window.confirm(t("tasks.deleteConfirm"))) return;
-    deleteTask(teamId, taskId);
+    setDeleteTargetId(taskId);
   };
 
+  const handleSingleDelete = useCallback(async () => {
+    if (!deleteTask || !deleteTargetId) return;
+    setSingleDeleting(true);
+    try {
+      await deleteTask(teamId, deleteTargetId);
+      setDeleteTargetId(null);
+    } finally {
+      setSingleDeleting(false);
+    }
+  }, [deleteTask, teamId, deleteTargetId]);
+
   const hasBulkDelete = !!deleteTasksBulk && pageTerminalIds.length > 0;
   const allPageSelected = pageTerminalIds.length > 0 && pageTerminalIds.every((id) => selectedIds.has(id));
   const someSelected = selectedIds.size > 0 && !allPageSelected;
@@ -255,6 +268,17 @@ export function TaskList({
         />
       )}
 
+      <ConfirmDialog
+        open={!!deleteTargetId}
+        onOpenChange={(v) => !v && setDeleteTargetId(null)}
+        title={t("tasks.delete")}
+        description={t("tasks.deleteConfirm")}
+        confirmLabel={t("tasks.delete")}
+        variant="destructive"
+        onConfirm={handleSingleDelete}
+        loading={singleDeleting}
+      />
+
       <ConfirmDeleteDialog
         open={confirmOpen}
         onOpenChange={setConfirmOpen}