feat: sprint-switcher op solo- en sprint-board pagina's

Sprint-switcher is nu beschikbaar op de drie hoofdpagina's: product
backlog, solo board en sprint board. Allen renderen 'm in een
gecentreerde balk net onder de NavBar. Sprint-data via gedeelde helper
getSprintSwitcherData.

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

lib/sprint-switcher-data.ts

@@ -0,0 +1,62 @@
+import 'server-only'
+
+import { prisma } from '@/lib/prisma'
+import { resolveActiveSprint } from '@/lib/active-sprint'
+import { sprintStatusToApi, type SprintStatusApi } from '@/lib/task-status'
+
+export type SprintSwitcherItem = {
+  id: string
+  code: string
+  sprint_goal: string
+  status: SprintStatusApi
+}
+
+export interface SprintSwitcherData {
+  sprintItems: SprintSwitcherItem[]
+  buildingSprintIds: string[]
+  activeSprintItem: SprintSwitcherItem | null
+}
+
+export async function getSprintSwitcherData(
+  productId: string,
+  opts?: { activeSprintId?: string | null },
+): Promise<SprintSwitcherData> {
+  const allSprints = await prisma.sprint.findMany({
+    where: { product_id: productId },
+    orderBy: { created_at: 'desc' },
+    select: { id: true, code: true, sprint_goal: true, status: true },
+  })
+
+  let buildingSprintIds: string[] = []
+  if (allSprints.length > 0) {
+    const runs = await prisma.sprintRun.findMany({
+      where: {
+        sprint_id: { in: allSprints.map(s => s.id) },
+        status: { in: ['QUEUED', 'RUNNING'] },
+      },
+      select: { sprint_id: true },
+    })
+    buildingSprintIds = Array.from(new Set(runs.map(r => r.sprint_id)))
+  }
+
+  const sprintItems: SprintSwitcherItem[] = allSprints.map(s => ({
+    id: s.id,
+    code: s.code,
+    sprint_goal: s.sprint_goal,
+    status: sprintStatusToApi(s.status),
+  }))
+
+  let activeSprintItem: SprintSwitcherItem | null = null
+  if (opts?.activeSprintId !== undefined) {
+    activeSprintItem = opts.activeSprintId
+      ? sprintItems.find(s => s.id === opts.activeSprintId) ?? null
+      : null
+  } else {
+    const resolved = await resolveActiveSprint(productId)
+    activeSprintItem = resolved
+      ? sprintItems.find(s => s.id === resolved.id) ?? null
+      : null
+  }
+
+  return { sprintItems, buildingSprintIds, activeSprintItem }
+}