feat(PBI-63): meerdere sprints per product + EXCLUDED + sprint-switcher (#161)

- Sprint lifecycle: ACTIVE→OPEN, COMPLETED→CLOSED, +ARCHIVED (FAILED behouden)
- TaskStatus: +EXCLUDED (overgeslagen door agent-loop via bestaande TO_DO filter)
- Cookie-gebaseerde actieve sprint per product (lib/active-sprint.ts)
- Route splitsen: /products/[id]/sprint/[sprintId] + /sprint redirect-page
- NavBar: gestapelde product/sprint dropdowns + BUILDING-badge derivatie
- Backlog selectie-modus + nieuwe-sprint-dialog (createSprintWithPbisAction)
- Migratie 20260507210000_sprint_lifecycle: ALTER TYPE RENAME (geen data-rewrite)
- Version bump 1.0.0 → 1.2.0

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

components/sprint/task-list.tsx

@@ -27,13 +27,24 @@ const STATUS_CYCLE: Record<string, 'TO_DO' | 'IN_PROGRESS' | 'DONE'> = {
   TO_DO: 'IN_PROGRESS',
   IN_PROGRESS: 'DONE',
   DONE: 'TO_DO',
+  EXCLUDED: 'TO_DO',
 }
 const STATUS_COLORS: Record<string, string> = {
   TO_DO: 'bg-status-todo/15 text-status-todo border-status-todo/30',
   IN_PROGRESS: 'bg-status-in-progress/15 text-status-in-progress border-status-in-progress/30',
   DONE: 'bg-status-done/15 text-status-done border-status-done/30',
+  EXCLUDED: 'bg-surface-container-low text-muted-foreground border-border',
+  FAILED: 'bg-status-failed/15 text-status-failed border-status-failed/30',
+  REVIEW: 'bg-status-review/15 text-status-review border-status-review/30',
+}
+const STATUS_LABELS: Record<string, string> = {
+  TO_DO: 'To Do',
+  IN_PROGRESS: 'Bezig',
+  REVIEW: 'Review',
+  DONE: 'Klaar',
+  FAILED: 'Mislukt',
+  EXCLUDED: 'Uitgesloten',
 }
-const STATUS_LABELS: Record<string, string> = { TO_DO: 'To Do', IN_PROGRESS: 'Bezig', DONE: 'Klaar' }
 
 
 export interface Task {
@@ -101,6 +112,7 @@ function SortableTaskRow({
             <p className={cn(
               'text-sm leading-snug line-clamp-2 flex-1',
               task.status === 'DONE' && 'line-through text-muted-foreground',
+              task.status === 'EXCLUDED' && 'text-muted-foreground/70 italic',
             )}>
               {task.title}
             </p>