feat(frontend): persist filter state across page reloads (#189)

* feat(frontend): persist filter state across page reloads

Add useLocalStorageState hook to persist filter/search state in
forward, node, tunnel, user, and limit pages. Reset filter clears
the persisted value from localStorage.

* feat(ui): add collapsible sidebar and smooth animations

vite-frontend/src/pages/node.tsx

@@ -62,6 +62,7 @@ import { tryCopyInstallCommand } from "@/pages/node/install-command";
 import { buildNodeSystemInfo } from "@/pages/node/system-info";
 import { useNodeOfflineTimers } from "@/pages/node/use-node-offline-timers";
 import { useNodeRealtime } from "@/pages/node/use-node-realtime";
+import { useLocalStorageState } from "@/hooks/use-local-storage-state";
 import { loadStoredOrder, saveOrder } from "@/utils/order-storage";
 
 interface Node {
@@ -158,7 +159,10 @@ export default function NodePage() {
   const [nodeList, setNodeList] = useState<Node[]>([]);
   const [nodeOrder, setNodeOrder] = useState<number[]>([]);
   const [loading, setLoading] = useState(false);
-  const [searchKeyword, setSearchKeyword] = useState("");
+  const [searchKeyword, setSearchKeyword] = useLocalStorageState(
+    "node-search-keyword",
+    "",
+  );
   const [isSearchVisible, setIsSearchVisible] = useState(false);
   const [dialogVisible, setDialogVisible] = useState(false);
   const [dialogTitle, setDialogTitle] = useState("");