feat(sprint): edit-icoon op PBI (Product Backlog) en story (Sprint Backlog)

- PBI-rij in Product Backlog-kolom: ✎-icoon rechts uitgelijnd, opent PbiDialog
  (rij is nu div role=button i.p.v. nested-button)
- Story-rij in Sprint Backlog-kolom: ✎-icoon vóór de Trash, opent StoryDialog
- SprintStory + PbiWithStories verrijkt met velden die de dialogen lezen
  (description / acceptance_criteria / pbi_id / created_at op story; priority /
  status / description op PBI)
- pbi.status via pbiStatusToApi → PbiStatusApi (DB UPPER_SNAKE → API lowercase)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/(app)/products/[id]/sprint/page.tsx

@@ -3,6 +3,7 @@ import { notFound, redirect } from 'next/navigation'
 import { getSession } from '@/lib/auth'
 import { getAccessibleProduct } from '@/lib/product-access'
 import { prisma } from '@/lib/prisma'
+import { pbiStatusToApi } from '@/lib/task-status'
 import { SprintBoardClient } from '@/components/sprint/sprint-board-client'
 import { SprintHeader } from '@/components/sprint/sprint-header'
 import type { SprintStory, PbiWithStories, ProductMember } from '@/components/sprint/sprint-backlog'
@@ -69,6 +70,10 @@ export default async function SprintBoardPage({ params, searchParams }: Props) {
     id: s.id,
     code: s.code,
     title: s.title,
+    description: s.description,
+    acceptance_criteria: s.acceptance_criteria,
+    pbi_id: s.pbi_id,
+    created_at: s.created_at,
     priority: s.priority,
     status: s.status,
     taskCount: s.tasks.length,
@@ -108,10 +113,17 @@ export default async function SprintBoardPage({ params, searchParams }: Props) {
       id: pbi.id,
       code: pbi.code,
       title: pbi.title,
+      priority: pbi.priority,
+      status: pbiStatusToApi(pbi.status),
+      description: pbi.description,
       stories: pbi.stories.map(s => ({
         id: s.id,
         code: s.code,
         title: s.title,
+        description: s.description,
+        acceptance_criteria: s.acceptance_criteria,
+        pbi_id: s.pbi_id,
+        created_at: s.created_at,
         priority: s.priority,
         status: s.status,
         taskCount: 0,