fix(admin) : handle null/IRI client in project filter for UserDrawer

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

frontend/components/user/UserDrawer.vue

@@ -121,7 +121,7 @@ const clientOptions = computed(() => [
 const filteredProjects = computed(() => {
     if (form.clientId === null) return []
     return allProjects.value.filter(
-        (p) => p.client !== null && p.client.id === form.clientId,
+        (p) => p.client && typeof p.client === 'object' && 'id' in p.client && p.client.id === form.clientId,
     )
 })