fix(tasks-ui): postmodern chrome, working clicks, adaptive layout, lean cards

Review feedback from the live 3384 install, fixed at the root:

- COLORS: the new stylesheet used var(--dsw-alias-accent) in 17 places — a
  token the DSH theme does NOT define, so every declaration was dropped
  (older files only survived because they carry fallbacks); container edges
  used border-l1 (4% black, invisible). Accent now rides
  --dsw-alias-state-business-primary, container edges --dsw-alias-border-l4.
- CLICKS: the canvas called setPointerCapture on pointerdown, which
  retargets the derived click to the container and killed every node (and
  ⓘ) interaction; jsdom cannot see this, a real browser can. Capture is
  gone and panning only starts from the background.
- LAYOUT: fit gave up silently at zero container size and never retried,
  centered only horizontally, and capped at 100% while a five-child level
  scaled to 35%. Now: ResizeObserver + first non-zero fit, both axes
  centered, a 0.78 readability floor, and layoutTasksGraphForWidth picks
  the flattest sibling arrangement that still meets that floor.
- CARDS: title (one line) + mono meta + live line only; display title,
  team role, full model id and latest text moved into the ⓘ popover.
- PANEL: metrics follow the approved 360x660 mockup (132x46 cards, 112 row
  stride), explicit line-heights, user-select:none, horizontal control
  cluster with a labelled mode button, always-visible team board strip.
- Tokens for two new popover headings across all 20 dictionaries.

Tests: 3 new page-interaction specs (click after background pointerdown,
node gestures never pan, team board visible without a click) and a
rewritten 9-case layout suite (band wrap, row reservation, width solver,
reserved live row). Full suite 1400 passed / 133 files.

src/client/locales.ts

@@ -420,6 +420,8 @@ export const zh = {
   tasksZoomOut: '缩小',
   tasksZoomFit: '适应画布',
   tasksNodeJump: '查看转录',
+  tasksNodeDetail: '节点详情',
+  workflowRun: '工作流',
   tasksNodeState: '状态',
   tasksNodeMode: '模式',
   tasksNodeModel: '模型',
@@ -913,6 +915,8 @@ export const en: Record<keyof typeof zh, string> = {
   tasksZoomOut: 'Zoom out',
   tasksZoomFit: 'Fit to canvas',
   tasksNodeJump: 'Open transcript',
+  tasksNodeDetail: 'Node detail',
+  workflowRun: 'Workflow',
   tasksNodeState: 'State',
   tasksNodeMode: 'Mode',
   tasksNodeModel: 'Model',