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.

tests/tasks-graph-layout.spec.ts

@@ -1,6 +1,8 @@
 /**
- * Unit tests for the layered graph layout (layoutTasksGraph): parent
- * centering over children bands, depth rows, and live-line heights.
+ * Unit tests for the layered graph layout: parent centering, depth rows, the
+ * sibling-band WRAP that keeps a narrow sidebar readable (and the row
+ * reservation that stops a wrapped band from landing on a sibling's
+ * children), the live-line height, and the width-aware solver.
  */
 import { describe, expect, it } from 'vitest'
 import {
@@ -9,7 +11,10 @@ import {
   GRAPH_NODE_H,
   GRAPH_NODE_W,
   GRAPH_PAD,
+  GRAPH_ROW_STRIDE,
+  bandColsFor,
   layoutTasksGraph,
+  layoutTasksGraphForWidth,
 } from '../src/client/tasks-graph-layout.ts'
 import type { TasksAgentNode, TasksNode } from '../src/client/tasks-model.ts'
 
@@ -22,14 +27,21 @@ function agent(id: string, parentId?: string, live = false): TasksAgentNode {
   }
 }
 
+/** The row index of one laid-out node. */
+function layoutRow(layout: ReturnType<typeof layoutTasksGraph>, id: string): number {
+  const box = layout.boxes.get(id)
+  if (box === undefined) throw new Error(`no box for ${id}`)
+  return (box.y - GRAPH_PAD) / GRAPH_ROW_STRIDE
+}
+
 describe('layoutTasksGraph', () => {
   it('places the root on row 0 and children one row below', () => {
     const nodes: TasksNode[] = [agent('root'), agent('a', 'root'), agent('b', 'root')]
     const layout = layoutTasksGraph(nodes)
-    expect(layout.boxes.get('root')).toMatchObject({ y: GRAPH_PAD, h: GRAPH_NODE_H })
-    const rowY = GRAPH_PAD + GRAPH_NODE_H + GRAPH_LIVE_H + GRAPH_GAP_Y
-    expect(layout.boxes.get('a')?.y).toBe(rowY)
-    expect(layout.boxes.get('b')?.y).toBe(rowY)
+    // A running agent reserves the live-line row (its "thinking" fallback).
+    expect(layout.boxes.get('root')).toMatchObject({ y: GRAPH_PAD, h: GRAPH_NODE_H + GRAPH_LIVE_H })
+    expect(layout.boxes.get('a')?.y).toBe(GRAPH_PAD + GRAPH_ROW_STRIDE)
+    expect(layout.boxes.get('b')?.y).toBe(GRAPH_PAD + GRAPH_ROW_STRIDE)
   })
 
   it('centers a parent over its children band', () => {
@@ -39,11 +51,11 @@ describe('layoutTasksGraph', () => {
     const b = layout.boxes.get('b')
     const root = layout.boxes.get('root')
     expect(a).toBeDefined(); expect(b).toBeDefined(); expect(root).toBeDefined()
-    const bandCenter = ((a!.x + b!.x + GRAPH_NODE_W) / 2)
+    const bandCenter = (a!.x + b!.x + GRAPH_NODE_W) / 2
     expect(root!.x + GRAPH_NODE_W / 2).toBeCloseTo(bandCenter, 5)
   })
 
-  it('widens the canvas for deep/wide forests and grows live rows', () => {
+  it('grows live rows and widens the canvas for deep/wide forests', () => {
     const nodes: TasksNode[] = [
       agent('root'), agent('a', 'root', true),
       agent('a1', 'a'), agent('a2', 'a'), agent('a3', 'a'),
@@ -60,4 +72,53 @@ describe('layoutTasksGraph', () => {
     expect(layout.boxes.get('root')).toBeDefined()
     expect(layout.boxes.get('ghost')).toBeDefined()
   })
+
+  it('wraps a wide sibling band into rows of maxBandCols', () => {
+    const nodes: TasksNode[] = [agent('root')]
+    for (let index = 0; index < 5; index += 1) nodes.push(agent(`c${index}`, 'root'))
+    const layout = layoutTasksGraph(nodes, { maxBandCols: 2 })
+    // Three wrapped rows of 2/2/1, never five on one line.
+    expect([layoutRow(layout, 'c0'), layoutRow(layout, 'c1')]).toEqual([1, 1])
+    expect([layoutRow(layout, 'c2'), layoutRow(layout, 'c3')]).toEqual([2, 2])
+    expect(layoutRow(layout, 'c4')).toBe(3)
+    // The canvas stays as narrow as one wrapped band.
+    expect(layout.width).toBeLessThanOrEqual(2 * GRAPH_NODE_W + 28 + 2 * GRAPH_PAD)
+  })
+
+  it('never lets a wrapped band land on a sibling subtree row', () => {
+    // root → [a (with a child), b, c, d] wrapped at 2 columns: the second
+    // band must start BELOW a's child, not on the same row as it.
+    const nodes: TasksNode[] = [
+      agent('root'), agent('a', 'root'), agent('b', 'root'),
+      agent('c', 'root'), agent('d', 'root'), agent('a1', 'a'),
+    ]
+    const layout = layoutTasksGraph(nodes, { maxBandCols: 2 })
+    expect(layoutRow(layout, 'c')).toBeGreaterThan(layoutRow(layout, 'a1'))
+    expect(layoutRow(layout, 'd')).toBe(layoutRow(layout, 'c'))
+  })
+})
+
+describe('bandColsFor / layoutTasksGraphForWidth', () => {
+  it('derives the column count from the container width', () => {
+    expect(bandColsFor(360)).toBe(2)
+    expect(bandColsFor(720)).toBe(4)
+    expect(bandColsFor(120)).toBe(1)
+  })
+
+  it('prefers a flat band when the container is wide', () => {
+    const nodes: TasksNode[] = [agent('root')]
+    for (let index = 0; index < 4; index += 1) nodes.push(agent(`c${index}`, 'root'))
+    const wide = layoutTasksGraphForWidth(nodes, 720)
+    expect(['c0', 'c1', 'c2', 'c3'].map(id => layoutRow(wide, id))).toEqual([1, 1, 1, 1])
+  })
+
+  it('wraps instead of overflowing wildly when the container is narrow', () => {
+    const nodes: TasksNode[] = [agent('root')]
+    for (let index = 0; index < 6; index += 1) nodes.push(agent(`c${index}`, 'root'))
+    const narrow = layoutTasksGraphForWidth(nodes, 360)
+    // Never wider than the tolerant budget (a small pan is allowed, a 3x
+    // overflow is not), and never a one-child-per-row ladder.
+    expect(narrow.width).toBeLessThanOrEqual(((360 - 24) / 0.78) * 1.2)
+    expect(layoutRow(narrow, 'c1')).toBe(layoutRow(narrow, 'c0'))
+  })
 })