feat : add archive/unarchive to TaskGroupDrawer and fix isFinal serialization

Fix TaskStatus getter naming (isFinal -> getIsFinal) so Symfony serializer
properly exposes the isFinal field. Add archive/unarchive buttons and
non-final tasks info message to TaskGroupDrawer. Remove obsolete TaskType
entity and repository.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/components/task/TaskGroupDrawer.vue

@@ -17,7 +17,32 @@
                 <ColorPicker v-model="form.color" />
             </div>
 
-            <div class="mt-6 flex justify-end">
+            <div
+                v-if="isEditing && !canArchive && !canUnarchive && nonFinalTasksCount > 0"
+                class="mt-4 rounded-md bg-amber-50 px-4 py-3 text-sm text-amber-700"
+            >
+                {{ $t('archive.groupNonFinalTasks', { count: nonFinalTasksCount }) }}
+            </div>
+
+            <div class="mt-6 flex items-center" :class="isEditing ? 'justify-between' : 'justify-end'">
+                <button
+                    v-if="canArchive"
+                    type="button"
+                    class="rounded-md bg-neutral-500 px-4 py-2 text-sm font-semibold text-white hover:bg-neutral-600 disabled:cursor-not-allowed disabled:opacity-50"
+                    :disabled="isSubmitting"
+                    @click="handleArchive"
+                >
+                    {{ $t('archive.archiveButton') }}
+                </button>
+                <button
+                    v-if="canUnarchive"
+                    type="button"
+                    class="rounded-md bg-neutral-500 px-4 py-2 text-sm font-semibold text-white hover:bg-neutral-600 disabled:cursor-not-allowed disabled:opacity-50"
+                    :disabled="isSubmitting"
+                    @click="handleUnarchive"
+                >
+                    {{ $t('archive.unarchiveButton') }}
+                </button>
                 <button
                     type="submit"
                     class="rounded-md bg-primary-500 px-6 py-2 text-sm font-semibold text-white hover:bg-secondary-500 disabled:cursor-not-allowed disabled:opacity-50"
@@ -32,12 +57,15 @@
 
 <script setup lang="ts">
 import type { TaskGroup, TaskGroupWrite } from '~/services/dto/task-group'
+import type { Task } from '~/services/dto/task'
 import { useTaskGroupService } from '~/services/task-groups'
+import { useTaskService } from '~/services/tasks'
 
 const props = defineProps<{
     modelValue: boolean
     group: TaskGroup | null
     projectId: number
+    tasks?: Task[]
 }>()
 
 const emit = defineEmits<{
@@ -79,6 +107,51 @@ watch(() => props.modelValue, (open) => {
 })
 
 const { create, update } = useTaskGroupService()
+const taskService = useTaskService()
+
+const groupTasks = computed(() =>
+    (props.tasks ?? []).filter(t => t.group?.id === props.group?.id)
+)
+
+const nonFinalTasksCount = computed(() =>
+    groupTasks.value.filter(t => t.status?.isFinal !== true).length
+)
+
+const canArchive = computed(() => {
+    if (!isEditing.value || !props.group || props.group.archived) return false
+    if (groupTasks.value.length === 0) return false
+    return nonFinalTasksCount.value === 0
+})
+
+const canUnarchive = computed(() => {
+    return isEditing.value && !!props.group?.archived
+})
+
+async function handleArchive() {
+    if (!props.group) return
+    isSubmitting.value = true
+    try {
+        await Promise.all(groupTasks.value.map(t => taskService.update(t.id, { archived: true })))
+        await update(props.group.id, { archived: true })
+        emit('saved')
+        isOpen.value = false
+    } finally {
+        isSubmitting.value = false
+    }
+}
+
+async function handleUnarchive() {
+    if (!props.group) return
+    isSubmitting.value = true
+    try {
+        await Promise.all(groupTasks.value.map(t => taskService.update(t.id, { archived: false })))
+        await update(props.group.id, { archived: false })
+        emit('saved')
+        isOpen.value = false
+    } finally {
+        isSubmitting.value = false
+    }
+}
 
 async function handleSubmit() {
     touched.title = true