feat(client): workflow-graph Tasks page with teams board and jobs drawer

The Subagent page becomes the Tasks page per the approved Variant-D design:

- tasks-model.ts feeds BOTH modes from one pre-order node list: graph
  canvas (TasksGraph: layered nodes over bezier edges, drag-pan,
  wheel-zoom-to-cursor, phase frames, bottom-right control cluster) and
  the classic tree (TasksTree: keyboard navigable) — the view toggle and
  fold toggle stay reachable in both modes.
- Workflow runs (workflows.list) hang under their origin agent; member
  agents re-parent under the run node, missing ones synthesize from run
  data; completed leaf agents fold into per-parent aggregate nodes
  (click or cluster toggle to expand/re-collapse).
- Agent Teams (experimental): roster enriches nodes; a header chip opens
  the shared task board popover with basic CAS operations (complete /
  reopen / delete / reassign / create / edit); no experimental layer →
  the whole block hides (structural degradation).
- Background jobs move into a bottom drawer that auto-collapses at 8+
  agents (manual toggle wins); job output opens as an anchored popover
  (event replay, never the model's cursor); two-click kill preserved.
- Live activity lines render as glyph + tool + args (tool-icons map onto
  host primitive icons).
- Node click jumps to the transcript; ⓘ opens the detail popover;
  popovers follow the selection-popup dismissal contract (Escape /
  outside click / anchor off-screen via IntersectionObserver).
- tasksViewMode pref (graph default) with a select row in settings;
  58 new copy keys across zh/en/ja + 18 third-language dictionaries;
  dead CSS from the old tree/dock pruned.
- Tests: 6 new page-interaction specs (auto-collapse, both-mode toggle,
  jump, fold, popover); jobs-view suite re-pointed at the popover;
  prefs/builtins/smoke lock tests updated for the new pref.

src/client/locales.ts

@@ -402,6 +402,64 @@ export const zh = {
   jobKill: '终止',
   jobKillConfirm: '再次点击确认终止',
   jobKillError: '终止失败',
+  tasksViewGraph: '工作流图',
+  tasksViewTree: '树状图',
+  tasksViewSwitchToGraph: '切换为工作流图',
+  tasksViewSwitchToTree: '切换为树状图',
+  settingsViewModeTitle: '任务管理默认视图',
+  settingsViewModeDesc: '任务管理页打开时的默认展示方式（页内仍可临时切换）',
+  settingsViewModeGraph: '工作流图',
+  settingsViewModeGraphDesc: '分层节点图，可缩放平移',
+  settingsViewModeTree: '树状图',
+  settingsViewModeTreeDesc: '经典缩进树，键盘可导航',
+  tasksWorkflowMember: '工作流成员',
+  tasksFoldCompleted: '✓ {count} 已完成',
+  tasksFoldExpand: '展开已完成的节点',
+  tasksFoldCollapse: '折叠已完成的节点',
+  tasksZoomIn: '放大',
+  tasksZoomOut: '缩小',
+  tasksZoomFit: '适应画布',
+  tasksNodeJump: '查看转录',
+  tasksNodeState: '状态',
+  tasksNodeMode: '模式',
+  tasksNodeModel: '模型',
+  tasksNodeTeamRole: '团队角色',
+  tasksNodeActivity: '最近活动',
+  tasksStateRunning: '运行中',
+  tasksStateIdle: '待命',
+  tasksStateDone: '已完成',
+  tasksStateError: '出错',
+  teamBoard: '团队任务板',
+  teamChip: '团队 {members} 成员 · {tasks} 任务',
+  teamMembers: '成员',
+  teamTasksEmpty: '暂无共享任务',
+  teamTaskCreate: '新建任务',
+  teamTaskSubject: '标题',
+  teamTaskDescription: '描述',
+  teamTaskOwner: '负责人',
+  teamTaskUnowned: '未认领',
+  teamTaskPending: '待办',
+  teamTaskInProgress: '进行中',
+  teamTaskCompleted: '已完成',
+  teamTaskBlocked: '阻塞',
+  teamTaskComplete: '完成',
+  teamTaskReopen: '重开',
+  teamTaskDelete: '删除',
+  teamTaskDeleteConfirm: '确认删除',
+  teamTaskEdit: '编辑',
+  teamTaskSave: '保存',
+  teamTaskCancel: '取消',
+  teamTaskConflict: '任务已被他人修改，已刷新',
+  teamTaskError: '操作失败：{message}',
+  teamTaskDeleted: '已删除',
+  workflowRunning: '进行中',
+  workflowCompleted: '已完成',
+  workflowCancelled: '已取消',
+  workflowFailed: '失败',
+  workflowPhaseUnnamed: '未命名阶段',
+  workflowMembers: '{done}/{total} 成员',
+  jobsAutoCollapsed: '代理较多，已自动折叠',
+  catalogLoadFailed: '{count} 个分支加载失败',
   addPluginsTabCard: '添加 Tab 插件',
   addPluginsTabCardDesc: '注册新的侧边栏页面',
   addPluginsViewerCard: '添加预览插件',
@@ -837,6 +895,64 @@ export const en: Record<keyof typeof zh, string> = {
   jobKill: 'Kill',
   jobKillConfirm: 'Click again to confirm kill',
   jobKillError: 'Kill failed',
+  tasksViewGraph: 'Workflow graph',
+  tasksViewTree: 'Tree',
+  tasksViewSwitchToGraph: 'Switch to the workflow graph',
+  tasksViewSwitchToTree: 'Switch to the tree',
+  settingsViewModeTitle: 'Tasks page default view',
+  settingsViewModeDesc: 'How the Tasks page renders on open (the in-page toggle still flips it ad hoc)',
+  settingsViewModeGraph: 'Workflow graph',
+  settingsViewModeGraphDesc: 'Layered node graph with zoom and pan',
+  settingsViewModeTree: 'Tree',
+  settingsViewModeTreeDesc: 'Classic indentation tree, keyboard navigable',
+  tasksWorkflowMember: 'Workflow member',
+  tasksFoldCompleted: '✓ {count} completed',
+  tasksFoldExpand: 'Expand the completed nodes',
+  tasksFoldCollapse: 'Collapse the completed nodes',
+  tasksZoomIn: 'Zoom in',
+  tasksZoomOut: 'Zoom out',
+  tasksZoomFit: 'Fit to canvas',
+  tasksNodeJump: 'Open transcript',
+  tasksNodeState: 'State',
+  tasksNodeMode: 'Mode',
+  tasksNodeModel: 'Model',
+  tasksNodeTeamRole: 'Team role',
+  tasksNodeActivity: 'Latest activity',
+  tasksStateRunning: 'Running',
+  tasksStateIdle: 'Idle',
+  tasksStateDone: 'Done',
+  tasksStateError: 'Error',
+  teamBoard: 'Team task board',
+  teamChip: 'Team {members} members · {tasks} tasks',
+  teamMembers: 'Members',
+  teamTasksEmpty: 'No shared tasks yet',
+  teamTaskCreate: 'New task',
+  teamTaskSubject: 'Subject',
+  teamTaskDescription: 'Description',
+  teamTaskOwner: 'Owner',
+  teamTaskUnowned: 'Unclaimed',
+  teamTaskPending: 'Pending',
+  teamTaskInProgress: 'In progress',
+  teamTaskCompleted: 'Completed',
+  teamTaskBlocked: 'Blocked',
+  teamTaskComplete: 'Complete',
+  teamTaskReopen: 'Reopen',
+  teamTaskDelete: 'Delete',
+  teamTaskDeleteConfirm: 'Confirm delete',
+  teamTaskEdit: 'Edit',
+  teamTaskSave: 'Save',
+  teamTaskCancel: 'Cancel',
+  teamTaskConflict: 'The task changed elsewhere; refreshed',
+  teamTaskError: 'Operation failed: {message}',
+  teamTaskDeleted: 'Deleted',
+  workflowRunning: 'Running',
+  workflowCompleted: 'Completed',
+  workflowCancelled: 'Cancelled',
+  workflowFailed: 'Failed',
+  workflowPhaseUnnamed: 'Unnamed phase',
+  workflowMembers: '{done}/{total} members',
+  jobsAutoCollapsed: 'Auto-collapsed (many agents)',
+  catalogLoadFailed: '{count} branches failed to load',
   addPluginsTabCard: 'Add tab plugins',
   addPluginsTabCardDesc: 'Register a new sidebar page',
   addPluginsViewerCard: 'Add preview plugins',