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-nl.ts

@@ -388,6 +388,64 @@ export const nl: Record<string, string> = {
   jobKill: 'Beëindigen',
   jobKillConfirm: 'Klik nogmaals om beëindigen te bevestigen',
   jobKillError: 'Beëindigen mislukt',
+  tasksViewGraph: 'Workflowgrafiek',
+  tasksViewTree: 'Boom',
+  tasksViewSwitchToGraph: 'Omschakelen naar de workflowgrafiek',
+  tasksViewSwitchToTree: 'Omschakelen naar de boom',
+  settingsViewModeTitle: 'Standaardweergave van de takenpagina',
+  settingsViewModeDesc: 'Hoe de takenpagina bij het openen wordt weergegeven (de schakelaar op de pagina wisselt nog steeds ad hoc)',
+  settingsViewModeGraph: 'Workflowgrafiek',
+  settingsViewModeGraphDesc: 'Gelaagde knoppengrafiek met in- en uitzoomen en pannen',
+  settingsViewModeTree: 'Boom',
+  settingsViewModeTreeDesc: 'Klassieke inspringboom, navigeerbaar met het toetsenbord',
+  tasksWorkflowMember: 'Workflowlid',
+  tasksFoldCompleted: '✓ {count} voltooid',
+  tasksFoldExpand: 'Voltooide knopen uitklappen',
+  tasksFoldCollapse: 'Voltooide knopen inklappen',
+  tasksZoomIn: 'Inzoomen',
+  tasksZoomOut: 'Uitzoomen',
+  tasksZoomFit: 'Passend maken',
+  tasksNodeJump: 'Transcript openen',
+  tasksNodeState: 'Status',
+  tasksNodeMode: 'Modus',
+  tasksNodeModel: 'Model',
+  tasksNodeTeamRole: 'Teamrol',
+  tasksNodeActivity: 'Laatste activiteit',
+  tasksStateRunning: 'Bezig',
+  tasksStateIdle: 'Inactief',
+  tasksStateDone: 'Voltooid',
+  tasksStateError: 'Fout',
+  teamBoard: 'Teamtakenbord',
+  teamChip: 'Team {members} leden · {tasks} taken',
+  teamMembers: 'Leden',
+  teamTasksEmpty: 'Nog geen gedeelde taken',
+  teamTaskCreate: 'Nieuwe taak',
+  teamTaskSubject: 'Onderwerp',
+  teamTaskDescription: 'Beschrijving',
+  teamTaskOwner: 'Verantwoordelijke',
+  teamTaskUnowned: 'Niet opgeëist',
+  teamTaskPending: 'Te doen',
+  teamTaskInProgress: 'Bezig',
+  teamTaskCompleted: 'Voltooid',
+  teamTaskBlocked: 'Geblokkeerd',
+  teamTaskComplete: 'Voltooien',
+  teamTaskReopen: 'Heropenen',
+  teamTaskDelete: 'Verwijderen',
+  teamTaskDeleteConfirm: 'Verwijderen bevestigen',
+  teamTaskEdit: 'Bewerken',
+  teamTaskSave: 'Opslaan',
+  teamTaskCancel: 'Annuleren',
+  teamTaskConflict: 'De taak is elders gewijzigd; vernieuwd',
+  teamTaskError: 'Bewerking mislukt: {message}',
+  teamTaskDeleted: 'Verwijderd',
+  workflowRunning: 'Bezig',
+  workflowCompleted: 'Voltooid',
+  workflowCancelled: 'Geannuleerd',
+  workflowFailed: 'Mislukt',
+  workflowPhaseUnnamed: 'Naamloze fase',
+  workflowMembers: '{done}/{total} leden',
+  jobsAutoCollapsed: 'Automatisch ingeklapt (veel agents)',
+  catalogLoadFailed: '{count} branches konden niet worden geladen',
   addPluginsTabCard: 'Tabblad-plugins toevoegen',
   addPluginsTabCardDesc: 'Een nieuwe zijbalkpagina registreren',
   addPluginsViewerCard: 'Preview-plugins toevoegen',