feat(projects) : archivage en masse des tickets sur statut final

- TaskBulkActions : prop canArchive + bouton archive conditionnel
- pages/projects/[id] : computed canArchiveSelection (true quand le filtre statut courant pointe vers un statut isFinal)
- purge la sélection des ids hors filtre courant pour garder le compteur cohérent en vue liste

frontend/components/task/TaskBulkActions.vue

@@ -79,6 +79,17 @@
                 @update:model-value="(v: number | null) => v && emit('bulk-update', 'group', v)"
             />
 
+            <!-- Archive (only when current filter targets a final status) -->
+            <MalioButtonIcon
+                v-if="canArchive"
+                icon="mdi:archive-outline"
+                aria-label="Archiver"
+                variant="ghost"
+                icon-size="22"
+                button-class="self-end text-neutral-500 hover:bg-primary-50 hover:text-primary-500"
+                @click="emit('bulk-archive')"
+            />
+
             <!-- Delete -->
             <MalioButtonIcon
                 icon="mdi:delete-outline"
@@ -113,9 +124,11 @@ const props = withDefaults(defineProps<{
     groups: TaskGroup[]
     selectedTasks?: Task[]
     projects?: Project[]
+    canArchive?: boolean
 }>(), {
     selectedTasks: () => [],
     projects: () => [],
+    canArchive: false,
 })
 
 const emit = defineEmits<{

frontend/pages/projects/[id]/index.vue

@@ -161,6 +161,7 @@
                 :priorities="priorities"
                 :efforts="efforts"
                 :groups="groups"
+                :can-archive="canArchiveSelection"
                 @toggle-all="toggleSelectAll(filteredTasks)"
                 @bulk-update="onBulkUpdate"
                 @bulk-archive="onBulkArchive"
@@ -297,6 +298,12 @@ const effortFilterOptions = computed(() =>
     efforts.value.map(e => ({ label: e.label, value: e.id }))
 )
 
+const canArchiveSelection = computed(() => {
+    if (selectedStatusId.value === null) return false
+    const status = statuses.value.find(s => s.id === selectedStatusId.value)
+    return status?.isFinal === true
+})
+
 const filteredTasks = computed(() => {
     let result = tasks.value.filter(t => !t.archived)
     if (selectedGroupId.value) {
@@ -323,6 +330,14 @@ const filteredTasks = computed(() => {
     return result
 })
 
+watch(filteredTasks, (list) => {
+    if (selectedTaskIds.size === 0) return
+    const visibleIds = new Set(list.map(t => t.id))
+    for (const id of selectedTaskIds) {
+        if (!visibleIds.has(id)) selectedTaskIds.delete(id)
+    }
+})
+
 function tasksByStatus(statusId: number): Task[] {
     return filteredTasks.value.filter(t => t.status?.id === statusId)
 }