feat(solo): preview-then-confirm flow in SoloBoard Voer-alle-uit

Vervang directe enqueueAllTodoJobsAction door previewEnqueueAllAction + BatchEnqueueBlockerDialog. Geen blocker → enqueueClaudeJobsBatchAction direct. Wel blocker → dialog met prefix-enqueue of annuleer. Loading-state op knop tijdens preview en confirm. 5 integratie-tests.

components/solo/solo-board.tsx

@@ -8,7 +8,8 @@ import {
 import { toast } from 'sonner'
 import { useSoloStore } from '@/stores/solo-store'
 import { taskStatusToApi } from '@/lib/task-status'
-import { enqueueAllTodoJobsAction } from '@/actions/claude-jobs'
+import { previewEnqueueAllAction, enqueueClaudeJobsBatchAction } from '@/actions/claude-jobs'
+import { BatchEnqueueBlockerDialog } from './batch-enqueue-blocker-dialog'
 import { Button } from '@/components/ui/button'
 import { DemoTooltip } from '@/components/shared/demo-tooltip'
 import { SplitPane } from '@/components/split-pane/split-pane'
@@ -61,6 +62,15 @@ export function SoloBoard({
   const [unassignedStories, setUnassignedStories] = useState(initialUnassigned)
   const [, startTransition] = useTransition()
   const [batchPending, startBatchTransition] = useTransition()
+  const [confirmPending, startConfirmTransition] = useTransition()
+
+  type BlockerDialogState = {
+    prefixCount: number
+    blockerReason: 'task-review' | 'pbi-blocked'
+    blockerLabel: string
+    prefixIds: string[]
+  }
+  const [blockerDialog, setBlockerDialog] = useState<BlockerDialogState | null>(null)
 
   const taskKey = initialTasks.map(t => t.id).join(',')
   useEffect(() => {
@@ -140,7 +150,42 @@ export function SoloBoard({
   function handleStartAll() {
     if (queueableCount === 0) return
     startBatchTransition(async () => {
-      const result = await enqueueAllTodoJobsAction(productId)
+      const preview = await previewEnqueueAllAction(productId)
+      if ('error' in preview) {
+        toast.error(preview.error)
+        return
+      }
+      if (preview.blockerIndex === null) {
+        const todoIds = preview.tasks.filter(t => t.status === 'TO_DO').map(t => t.id)
+        const result = await enqueueClaudeJobsBatchAction(productId, todoIds)
+        if ('error' in result) {
+          toast.error(result.error)
+        } else if (result.count === 0) {
+          toast.info('Geen taken om te starten')
+        } else {
+          toast.success(`${result.count} ${result.count === 1 ? 'agent' : 'agents'} ingeschakeld`)
+        }
+      } else {
+        const blockerTask = preview.tasks[preview.blockerIndex]
+        const blockerLabel = preview.blockerReason === 'task-review'
+          ? `${blockerTask.story_title} — ${blockerTask.title}`
+          : blockerTask.story_title
+        setBlockerDialog({
+          prefixCount: preview.blockerIndex,
+          blockerReason: preview.blockerReason!,
+          blockerLabel,
+          prefixIds: preview.tasks.slice(0, preview.blockerIndex).map(t => t.id),
+        })
+      }
+    })
+  }
+
+  function handleBlockerConfirm() {
+    if (!blockerDialog) return
+    const { prefixIds } = blockerDialog
+    setBlockerDialog(null)
+    startConfirmTransition(async () => {
+      const result = await enqueueClaudeJobsBatchAction(productId, prefixIds)
       if ('error' in result) {
         toast.error(result.error)
       } else if (result.count === 0) {
@@ -159,9 +204,9 @@ export function SoloBoard({
             <Button
               size="sm"
               onClick={handleStartAll}
-              disabled={isDemo || batchPending || queueableCount === 0}
+              disabled={isDemo || batchPending || confirmPending || queueableCount === 0}
             >
-              {batchPending ? 'Starten…' : `Start agents (${queueableCount})`}
+              {batchPending || confirmPending ? 'Starten…' : `Start agents (${queueableCount})`}
             </Button>
           </DemoTooltip>
           {sprintGoal && (
@@ -234,6 +279,18 @@ export function SoloBoard({
         onOpenChange={setSheetOpen}
         onClaim={(id) => setUnassignedStories(prev => prev.filter(s => s.id !== id))}
       />
+
+      {blockerDialog && (
+        <BatchEnqueueBlockerDialog
+          open
+          onOpenChange={(v) => { if (!v) setBlockerDialog(null) }}
+          prefixCount={blockerDialog.prefixCount}
+          blockerReason={blockerDialog.blockerReason}
+          blockerLabel={blockerDialog.blockerLabel}
+          onConfirm={handleBlockerConfirm}
+          onCancel={() => setBlockerDialog(null)}
+        />
+      )}
     </div>
   )
 }