feat: initial ChatUI modular con arbol de temas, chat n8n y KeyNotes editables

src/components/layout/Sidebar.tsx

@@ -0,0 +1,15 @@
+import { TreeView } from '../tree/TreeView'
+
+export function Sidebar() {
+  return (
+    <div className="flex h-full flex-col">
+      <div className="flex items-center justify-between px-3 py-3 border-b border-slate-700/60">
+        <h1 className="text-sm font-semibold tracking-wide text-slate-200">WebChatV2</h1>
+        <span className="text-[10px] uppercase text-slate-500">Temas</span>
+      </div>
+      <div className="min-h-0 flex-1 overflow-y-auto p-2">
+        <TreeView />
+      </div>
+    </div>
+  )
+}