fix(ui) : hide archived groups in task creation and remove unused TaskDrawer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/components/task/TaskModal.vue

@@ -365,7 +365,7 @@ const userOptions = computed(() =>
 )
 
 const groupOptions = computed(() => {
-    let filtered = props.groups
+    let filtered = props.groups.filter(g => !g.archived)
     if (showProjectSelect.value && form.projectId) {
         filtered = filtered.filter(g => g.project?.id === form.projectId)
     }