feat(codes): UI toont en accepteert code voor taken

- TaskDialog: code-input boven titel (font-mono, optional,
  placeholder "auto"), CodeBadge in dialog header bij edit
- EditTaskLoader: select code uit DB voor de dialog
- Solo page: vervang inline deriveTaskCode-logica door directe
  task.code uit DB
- Sprint page + TaskList + SprintBoardClient: Task-type krijgt
  verplicht code-veld; TaskList laat ongebruikte storyCode prop
  vallen omdat code-derivatie niet meer nodig is

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

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

@@ -72,26 +72,21 @@ export default async function SoloProductPage({ params }: Props) {
     }),
   ])
 
-  const tasks: SoloTask[] = rawTasks.map(t => {
-    const positionInStory = t.story.tasks.findIndex(st => st.id === t.id)
-    const taskCode =
-      t.story.code && positionInStory >= 0 ? `${t.story.code}.${positionInStory + 1}` : null
-    return {
-      id: t.id,
-      title: t.title,
-      description: t.description,
-      implementation_plan: t.implementation_plan,
-      priority: t.priority,
-      sort_order: t.sort_order,
-      status: t.status as SoloTask['status'],
-      verify_only: t.verify_only,
-      verify_required: t.verify_required as SoloTask['verify_required'],
-      story_id: t.story.id,
-      story_code: t.story.code,
-      story_title: t.story.title,
-      task_code: taskCode,
-    }
-  })
+  const tasks: SoloTask[] = rawTasks.map(t => ({
+    id: t.id,
+    title: t.title,
+    description: t.description,
+    implementation_plan: t.implementation_plan,
+    priority: t.priority,
+    sort_order: t.sort_order,
+    status: t.status as SoloTask['status'],
+    verify_only: t.verify_only,
+    verify_required: t.verify_required as SoloTask['verify_required'],
+    story_id: t.story.id,
+    story_code: t.story.code,
+    story_title: t.story.title,
+    task_code: t.code,
+  }))
 
   const unassignedStories: UnassignedStory[] = rawUnassigned.map(s => ({
     id: s.id,

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

@@ -81,6 +81,7 @@ export default async function SprintBoardPage({ params, searchParams }: Props) {
   for (const story of sprintStories) {
     tasksByStory[story.id] = story.tasks.map(t => ({
       id: t.id,
+      code: t.code,
       title: t.title,
       description: t.description,
       priority: t.priority,

app/_components/tasks/edit-task-loader.tsx

@@ -25,6 +25,7 @@ export async function EditTaskLoader({
     },
     select: {
       id: true,
+      code: true,
       title: true,
       description: true,
       implementation_plan: true,

app/_components/tasks/task-dialog.tsx

@@ -27,6 +27,8 @@ import {
 } from '@/components/ui/alert-dialog'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
+import { CodeBadge } from '@/components/shared/code-badge'
+import { MAX_CODE_LENGTH } from '@/lib/code'
 import { DemoTooltip } from '@/components/shared/demo-tooltip'
 import {
   useDirtyCloseGuard,
@@ -45,6 +47,7 @@ import { cn } from '@/lib/utils'
 
 export interface TaskDialogTask {
   id: string
+  code: string | null
   title: string
   description: string | null
   implementation_plan: string | null
@@ -88,6 +91,7 @@ export function TaskDialog({ task, storyId, productId, closePath, isDemo = false
     resolver: zodResolver(taskSchema),
     mode: 'onTouched',
     defaultValues: {
+      code: task?.code ?? '',
       title: task?.title ?? '',
       description: task?.description ?? '',
       implementation_plan: task?.implementation_plan ?? '',
@@ -173,9 +177,12 @@ export function TaskDialog({ task, storyId, productId, closePath, isDemo = false
         >
           {/* Sticky header */}
           <div className={entityDialogHeaderClasses}>
-            <DialogTitle className="text-xl font-semibold">
-              {isEdit ? 'Taak bewerken' : 'Nieuwe taak'}
-            </DialogTitle>
+            <div className="flex items-center gap-2">
+              <DialogTitle className="text-xl font-semibold">
+                {isEdit ? 'Taak bewerken' : 'Nieuwe taak'}
+              </DialogTitle>
+              {isEdit && task?.code && <CodeBadge code={task.code} />}
+            </div>
             {isEdit && (
               <span className="text-xs text-muted-foreground">
                 Aangemaakt:{' '}
@@ -190,6 +197,27 @@ export function TaskDialog({ task, storyId, productId, closePath, isDemo = false
 
           {/* Scrollable form body */}
           <div className={entityDialogBodyClasses}>
+            {/* Code */}
+            <div>
+              <label htmlFor="task-code" className="text-sm font-medium mb-2 block">
+                Code
+              </label>
+              <Input
+                id="task-code"
+                {...form.register('code')}
+                aria-invalid={!!form.formState.errors.code}
+                placeholder="auto (T-1, T-2, ...)"
+                className="font-mono"
+                maxLength={MAX_CODE_LENGTH}
+                onKeyDown={(e) => { if (e.key === 'Enter') e.preventDefault() }}
+              />
+              {form.formState.errors.code && (
+                <p className="text-xs text-destructive mt-1">
+                  {form.formState.errors.code.message}
+                </p>
+              )}
+            </div>
+
             {/* Title */}
             <div>
               <label className="text-sm font-medium mb-2 block">

components/sprint/sprint-board-client.tsx

@@ -229,7 +229,6 @@ export function SprintBoardClient({
             <TaskList
               key="tasks"
               storyId={selectedStoryId}
-              storyCode={stories.find(s => s.id === selectedStoryId)?.code ?? null}
               sprintId={sprintId}
               productId={productId}
               tasks={selectedTasks}

components/sprint/task-list.tsx

@@ -17,7 +17,6 @@ import { Badge } from '@/components/ui/badge'
 import { CodeBadge } from '@/components/shared/code-badge'
 import { PanelNavBar } from '@/components/shared/panel-nav-bar'
 import { PRIORITY_BORDER } from '@/components/backlog/backlog-card'
-import { deriveTaskCode } from '@/lib/code'
 import { useSprintStore } from '@/stores/sprint-store'
 import { updateTaskStatusAction, reorderTasksAction } from '@/actions/tasks'
 import { DemoTooltip } from '@/components/shared/demo-tooltip'
@@ -38,6 +37,7 @@ const STATUS_LABELS: Record<string, string> = { TO_DO: 'To Do', IN_PROGRESS: 'Be
 
 export interface Task {
   id: string
+  code: string
   title: string
   description: string | null
   priority: number
@@ -48,7 +48,6 @@ export interface Task {
 
 interface TaskListProps {
   storyId: string
-  storyCode: string | null
   sprintId: string
   productId: string
   tasks: Task[]
@@ -126,7 +125,7 @@ function SortableTaskRow({
   )
 }
 
-export function TaskList({ storyId, storyCode, sprintId: _sprintId, productId: _productId, tasks, isDemo }: TaskListProps) {
+export function TaskList({ storyId, sprintId: _sprintId, productId: _productId, tasks, isDemo }: TaskListProps) {
   const { taskOrder, initTasks, reorderTasks, rollbackTasks } = useSprintStore()
   const [activeDragId, setActiveDragId] = useState<string | null>(null)
   const [, startTransition] = useTransition()
@@ -222,11 +221,11 @@ export function TaskList({ storyId, storyCode, sprintId: _sprintId, productId: _
             onDragEnd={handleDragEnd}
           >
             <SortableContext items={orderedTasks.map(t => t.id)} strategy={verticalListSortingStrategy}>
-              {orderedTasks.map((task, idx) => (
+              {orderedTasks.map((task) => (
                 <SortableTaskRow
                   key={task.id}
                   task={task}
-                  code={deriveTaskCode(storyCode, idx + 1)}
+                  code={task.code}
                   isDemo={isDemo}
                   onStatusToggle={() => handleStatusToggle(task)}
                   onEdit={() => openEditDialog(task.id)}