feat(dashboard): red-dot weak-point map on /defects (T7)

Overlay each filed defect as a red dot inside its section box with a
diagonal date label; cap visible dots and collapse the remainder to a
"+N more" using the authoritative per-section counts (T6).

Add an `overlay` scoped slot to BoardView (C2) so the dashboard can layer
dots without forking the board definition (F1); the reporting view leaves
it empty. DotMap groups the bounded feed by section and the /defects page
wires both endpoints.

app/components/BoardView.vue

@@ -40,6 +40,7 @@ const hoveredId = ref<string | null>(null);
           >
             <span class="section__label">{{ section.label }}</span>
             <span class="section__size">{{ section.size }}</span>
+            <slot name="overlay" :section-id="section.id" />
           </button>
         </div>
       </div>
@@ -104,6 +105,8 @@ const hoveredId = ref<string | null>(null);
   cursor: pointer;
   padding: 0.5rem;
   box-sizing: border-box;
+  /* Positioning context for the dashboard's absolutely-placed dots (C5). */
+  position: relative;
   /* ISO 216: every A-series sheet is landscape √2 : 1 (width : height). */
   aspect-ratio: 1.41421356 / 1;
 }

app/components/DotMap.vue

@@ -0,0 +1,107 @@
+<script setup lang="ts">
+// The weak-point dot map (C5, F4): overlays each defect as a red dot inside its
+// Section box with a diagonal date label. Visible dots are capped (~8–12) and
+// the remainder collapses to a "+N more" marker, so a hot Section stays legible
+// (DESIGN §5, ADR T7 — dot positions are cosmetic; the Section is the pin).
+//
+// Reuses BoardView (C2) via its `overlay` slot, and the feed + per-section
+// counts from T6: `defects` are the newest-first feed slice (bounded), `counts`
+// the true per-section totals that drive the "+N more" arithmetic.
+interface DotDefect {
+  id: string
+  sectionId: string
+  createdAt: string | Date
+}
+
+const props = defineProps<{
+  defects: DotDefect[]
+  counts: Record<string, number>
+  cap?: number
+}>()
+
+const cap = computed(() => props.cap ?? 10)
+
+// Group the feed by section, preserving its newest-first order.
+const bySection = computed(() => {
+  const map: Record<string, DotDefect[]> = {}
+  for (const d of props.defects) (map[d.sectionId] ??= []).push(d)
+  return map
+})
+
+const dotsFor = (id: string) => (bySection.value[id] ?? []).slice(0, cap.value)
+
+// Hidden defects = true total (counts, authoritative) minus what we drew.
+function overflowFor(id: string): number {
+  const total = props.counts[id] ?? bySection.value[id]?.length ?? 0
+  return Math.max(0, total - dotsFor(id).length)
+}
+
+// Compact, locale-free date stamp (DD/MM, UTC) for the diagonal label.
+function formatDate(value: string | Date): string {
+  const d = new Date(value)
+  const dd = String(d.getUTCDate()).padStart(2, '0')
+  const mm = String(d.getUTCMonth() + 1).padStart(2, '0')
+  return `${dd}/${mm}`
+}
+
+// Cosmetic scatter: a stable 5-wide grid inside the box (ADR T7).
+function dotStyle(index: number) {
+  return {
+    left: `${12 + (index % 5) * 17}%`,
+    top: `${20 + Math.floor(index / 5) * 22}%`,
+  }
+}
+</script>
+
+<template>
+  <BoardView>
+    <template #overlay="{ sectionId }">
+      <span
+        v-for="(defect, index) in dotsFor(sectionId)"
+        :key="defect.id"
+        class="dot"
+        :style="dotStyle(index)"
+        data-test="dot"
+      >
+        <span class="dot__date">{{ formatDate(defect.createdAt) }}</span>
+      </span>
+
+      <span v-if="overflowFor(sectionId) > 0" class="dot-more" data-test="more">
+        +{{ overflowFor(sectionId) }} more
+      </span>
+    </template>
+  </BoardView>
+</template>
+
+<style scoped>
+.dot {
+  position: absolute;
+  width: 0.6rem;
+  height: 0.6rem;
+  border-radius: 50%;
+  background: #e11d48;
+  /* Centre the dot on its grid point so labels splay outward consistently. */
+  transform: translate(-50%, -50%);
+}
+
+.dot__date {
+  position: absolute;
+  left: 0.7rem;
+  bottom: 0.7rem;
+  font-size: 0.6rem;
+  line-height: 1;
+  white-space: nowrap;
+  /* Diagonal label, as on the physical board. */
+  transform: rotate(-45deg);
+  transform-origin: bottom left;
+}
+
+.dot-more {
+  position: absolute;
+  right: 0.4rem;
+  bottom: 0.4rem;
+  font-size: 0.7rem;
+  font-weight: 600;
+  color: #e11d48;
+}
+</style>

app/pages/defects.vue

@@ -1,6 +1,23 @@
 <script setup lang="ts">
 // Defect-viewing route (`/defects`) — the read-only board with the weak-point
 // map and feed. Same domain as reporting (ADR 0004).
+import { sections } from '~/board/definition'
+
+interface DefectView {
+  id: string
+  sectionId: string
+  createdAt: string
+}
+
+// Fetch enough of the feed to fill every section's dot cap, plus the
+// authoritative per-section totals that drive each "+N more" (T6).
+const { data: defects } = await useFetch<DefectView[]>('/api/defects', {
+  query: { limit: sections.length * 12 },
+  default: () => [],
+})
+const { data: counts } = await useFetch<Record<string, number>>('/api/defects/counts', {
+  default: () => ({}),
+})
 </script>
 
 <template>
@@ -10,8 +27,8 @@
       <p class="opacity-70">Every defect filed on the board.</p>
     </header>
 
-    <BoardView />
+    <DotMap :defects="defects" :counts="counts" />
 
-    <p class="opacity-60">The red-dot map (T7) and defect feed (T8) land next.</p>
+    <p class="opacity-60">The defect feed and verbatim modal (T8) land next.</p>
   </main>
 </template>

tasks/todo.md

@@ -17,7 +17,7 @@ review.
 
 ## Phase 3 — See weak points (G2)
 - [x] **T6** Defects read API: feed + per-section counts (C7) — F6 (M) — _deps: T3_
-- [ ] **T7** Dashboard DotMap (C5) — F4 (M) — _deps: T2, T6_
+- [x] **T7** Dashboard DotMap (C5) — F4 (M) — _deps: T2, T6_
 - [ ] **T8** VerbatimModal + Feed (C6) — F5 (M) — _deps: T6, T7_
 - [ ] ⛳ **Checkpoint:** dashboard dot map + feed + modal work, ≤350ms @2k, human review
 

tests/dotmap.nuxt.spec.ts

@@ -0,0 +1,59 @@
+// @vitest-environment nuxt
+import { describe, it, expect } from 'vitest'
+import { mountSuspended } from '@nuxt/test-utils/runtime'
+import type { VueWrapper } from '@vue/test-utils'
+import DotMap from '../app/components/DotMap.vue'
+
+// The section box the overlay dots are rendered inside (BoardView marks each
+// section with `data-section-id`).
+const section = (wrapper: VueWrapper, id: string) =>
+  wrapper.find(`[data-section-id="${id}"]`)
+
+describe('DotMap', () => {
+  it('renders a red dot with a date label inside the defect’s section', async () => {
+    const wrapper = await mountSuspended(DotMap, {
+      props: {
+        defects: [{ id: 'd1', sectionId: 'macroplan', createdAt: '2026-05-28T10:00:00Z' }],
+        counts: { macroplan: 1 },
+      },
+    })
+
+    const dots = section(wrapper, 'macroplan').findAll('[data-test="dot"]')
+    expect(dots).toHaveLength(1)
+    expect(dots[0]!.text()).toContain('28/05')
+
+    // A section with no defects shows no dots.
+    expect(section(wrapper, 'problem-solving').findAll('[data-test="dot"]')).toHaveLength(0)
+  })
+
+  it('caps visible dots and collapses the overflow to "+N more"', async () => {
+    const cap = 10
+    const defects = Array.from({ length: 15 }, (_, i) => ({
+      id: `d${i}`,
+      sectionId: 'feature-kanban',
+      createdAt: '2026-05-28T10:00:00Z',
+    }))
+
+    const wrapper = await mountSuspended(DotMap, {
+      // Feed holds 15 for this section but the true total is 42 (counts).
+      props: { defects, counts: { 'feature-kanban': 42 }, cap },
+    })
+
+    const box = section(wrapper, 'feature-kanban')
+    expect(box.findAll('[data-test="dot"]')).toHaveLength(cap)
+    const more = box.find('[data-test="more"]')
+    expect(more.exists()).toBe(true)
+    expect(more.text()).toContain('+32 more') // 42 total − 10 shown
+  })
+
+  it('shows no overflow marker when a section is at or below the cap', async () => {
+    const wrapper = await mountSuspended(DotMap, {
+      props: {
+        defects: [{ id: 'd1', sectionId: 'macroplan', createdAt: '2026-05-28T10:00:00Z' }],
+        counts: { macroplan: 1 },
+      },
+    })
+
+    expect(section(wrapper, 'macroplan').find('[data-test="more"]').exists()).toBe(false)
+  })
+})