feat: Enhance UX with editable paths, settings refinement, and disconnected state visuals

App.tsx

@@ -12,17 +12,22 @@ import { CreateFolderModal, RenameModal, DeleteModal } from './components/FileAc
 
 const App: React.FC = () => {
   // --- State ---
+  const savedPref = localStorage.getItem('save_connection_info') !== 'false';
+  const [saveConnectionInfo, setSaveConnectionInfo] = useState(savedPref);
+
   const [connection, setConnection] = useState({
-    host: localStorage.getItem('last_host') || '',
-    user: localStorage.getItem('last_user') || '',
+    host: savedPref ? (localStorage.getItem('last_host') || '') : '',
+    user: savedPref ? (localStorage.getItem('last_user') || '') : '',
     pass: '',
-    port: localStorage.getItem('last_port') || '21',
-    protocol: (localStorage.getItem('last_protocol') as 'ftp' | 'sftp') || 'ftp',
+    port: savedPref ? (localStorage.getItem('last_port') || '21') : '21',
+    protocol: savedPref ? ((localStorage.getItem('last_protocol') as 'ftp' | 'sftp') || 'ftp') : 'ftp',
     passive: true,
     initialPath: '', // New field for Session-specific initial path
     connected: false,
     connecting: false
   });
+  const [isBackendConnected, setIsBackendConnected] = useState(false);
+  const [refreshKey, setRefreshKey] = useState(0); // To force FilePane input revert on error
 
   const [logs, setLogs] = useState<LogEntry[]>([]);
   const [queue, setQueue] = useState<TransferItem[]>([]);
@@ -74,11 +79,20 @@ const App: React.FC = () => {
 
   // --- Persistence Effects ---
   useEffect(() => {
+    localStorage.setItem('save_connection_info', String(saveConnectionInfo));
+
+    if (saveConnectionInfo) {
       localStorage.setItem('last_host', connection.host);
       localStorage.setItem('last_user', connection.user);
       localStorage.setItem('last_port', connection.port);
       localStorage.setItem('last_protocol', connection.protocol);
-  }, [connection.host, connection.user, connection.port, connection.protocol]);
+    } else {
+      localStorage.removeItem('last_host');
+      localStorage.removeItem('last_user');
+      localStorage.removeItem('last_port');
+      localStorage.removeItem('last_protocol');
+    }
+  }, [connection.host, connection.user, connection.port, connection.protocol, saveConnectionInfo]);
 
   useEffect(() => {
     if (local.path) localStorage.setItem('last_local_path', local.path);
@@ -110,6 +124,7 @@ const App: React.FC = () => {
 
           ws.onopen = () => {
             addLog('success', '백엔드 프록시 서버에 연결되었습니다.');
+            setIsBackendConnected(true);
             setShowConnectionHelp(false);
             // Initial Data Requests
             ws!.send(JSON.stringify({ command: 'GET_SITES' }));
@@ -117,6 +132,55 @@ const App: React.FC = () => {
             ws!.send(JSON.stringify({ command: 'LOCAL_LIST', path: storedLocalPath }));
           };
 
+          ws.onmessage = (event) => {
+            try {
+              const data = JSON.parse(event.data);
+
+              switch (data.type) {
+                // ... (no change to inside of switch) ...
+                case 'status':
+                  if (data.status === 'connected') {
+                    setConnection(prev => ({ ...prev, connected: true, connecting: false }));
+                    addLog('success', data.message || 'FTP 연결 성공');
+
+                    // Use Ref for latest state (especially initialPath from Site Manager)
+                    const currentConn = connectionRef.current;
+
+                    // 1. Initial Directory from Site Config
+                    if (currentConn.initialPath) {
+                      ws?.send(JSON.stringify({ command: 'LIST', path: currentConn.initialPath }));
+                    }
+                    // 2. Last Visited Path (Persistence)
+                    else {
+                      const lastRemote = localStorage.getItem(`last_remote_path_${currentConn.host}`);
+                      const initialPath = lastRemote || '/';
+                      ws?.send(JSON.stringify({ command: 'LIST', path: initialPath }));
+                    }
+                  } else if (data.status === 'disconnected') {
+                    setConnection(prev => ({ ...prev, connected: false, connecting: false }));
+                    setRemote(prev => ({ ...prev, files: [], path: '/' }));
+                    addLog('system', 'FTP 연결 종료');
+                  } else if (data.status === 'error') {
+                    setConnection(prev => ({ ...prev, connecting: false }));
+                    addLog('error', data.message);
+                  }
+                  break;
+
+                case 'list':
+                // ... (rest of cases handled by maintaining existing code structure or using multi-replace if I was confident, but here let's careful) ...
+                // Since replace_file_content works on lines, I should target specific blocks. 
+                // BE CAREFUL: attempting to replace too large block blindly.
+                // I should stick to smaller replaces.
+              }
+
+              // To avoid re-writing the huge switch content, I will use multiple Replace calls or just target onopen/onclose.
+            } catch (e) {
+              // ...
+            }
+          }; // This close brace is problematic if I don't include the switch logic.
+          // Better: just replace onopen and onclose separately.
+
+
           ws.onmessage = (event) => {
             try {
               const data = JSON.parse(event.data);
@@ -185,13 +249,16 @@ const App: React.FC = () => {
                     files: sortedLocalFiles,
                     isLoading: false
                   });
+                  addLog('success', `[로컬] 이동 완료: ${data.path}`);
                   break;
 
                 case 'error':
                   addLog('error', data.message);
+                  window.alert(data.message); // Show error dialog
                   setConnection(prev => ({ ...prev, connecting: false }));
                   setRemote(prev => ({ ...prev, isLoading: false }));
                   setLocal(prev => ({ ...prev, isLoading: false }));
+                  setRefreshKey(prev => prev + 1); // Revert invalid inputs
                   break;
 
                 case 'success':
@@ -212,6 +279,8 @@ const App: React.FC = () => {
           };
 
           ws.onclose = (e) => {
+            setIsBackendConnected(false);
+            setConnection(prev => ({ ...prev, connected: false, connecting: false }));
             if (e.code !== 1000) { // Not normal closure
               addLog('error', '백엔드 서버와 연결이 끊어졌습니다. 재연결 시도 중...');
               if (window.location.protocol === 'https:') {
@@ -557,7 +626,13 @@ startServer();
   return (
     <div className="flex flex-col h-screen bg-slate-50 text-slate-800 font-sans">
       {/* Modals */}
-      <SettingsModal isOpen={showSettings} onClose={() => setShowSettings(false)} />
+
+      <SettingsModal
+        isOpen={showSettings}
+        onClose={() => setShowSettings(false)}
+        saveConnectionInfo={saveConnectionInfo}
+        onToggleSaveConnectionInfo={setSaveConnectionInfo}
+      />
       <ConnectionHelpModal isOpen={showConnectionHelp} onClose={() => setShowConnectionHelp(false)} />
       <HelpModal isOpen={showHelp} onClose={() => setShowHelp(false)} initialTab={helpInitialTab} />
       <SiteManagerModal
@@ -717,7 +792,7 @@ startServer();
         {/* Local Pane */}
         <div className="flex-1 min-h-0 flex flex-col min-w-[300px]">
           <FilePane
-            title="로컬 사이트 (내 컴퓨터)"
+            title="로컬 (내 컴퓨터)"
             icon="local"
             path={local.path}
             files={local.files}
@@ -726,7 +801,8 @@ startServer();
             onNavigateUp={() => handleLocalNavigate(local.path.split(/\/|\\/).slice(0, -1).join(local.path.includes('\\') ? '\\' : '/') || (local.path.includes('\\') ? 'C:\\' : '/'))}
             onSelectionChange={setSelectedLocalIds}
             selectedIds={selectedLocalIds}
-            connected={true}
+            connected={isBackendConnected}
+            refreshKey={refreshKey}
             onCreateFolder={() => initiateCreateFolder(true)}
             onDelete={() => initiateDelete(true)}
             onRename={() => initiateRename(true)}
@@ -746,7 +822,7 @@ startServer();
         {/* Remote Pane */}
         <div className="flex-1 min-h-0 flex flex-col min-w-[300px]">
           <FilePane
-            title={`리모트 사이트: ${connection.host}`}
+            title={`리모트 (${connection.host})`}
             icon="remote"
             path={remote.path}
             files={remote.files}
@@ -756,6 +832,7 @@ startServer();
             onSelectionChange={setSelectedRemoteIds}
             selectedIds={selectedRemoteIds}
             connected={connection.connected}
+            refreshKey={refreshKey}
             onCreateFolder={() => initiateCreateFolder(false)}
             onDelete={() => initiateDelete(false)}
             onRename={() => initiateRename(false)}

components/FilePane.tsx

@@ -15,6 +15,7 @@ interface FilePaneProps {
   onSelectionChange: (ids: Set<string>) => void;
   selectedIds: Set<string>;
   connected?: boolean;
+  refreshKey?: number;
   onCreateFolder?: () => void;
   onDelete?: () => void;
   onRename?: () => void;
@@ -31,12 +32,28 @@ const FilePane: React.FC<FilePaneProps> = ({
   onSelectionChange,
   selectedIds,
   connected = true,
+  refreshKey,
   onCreateFolder,
   onDelete,
   onRename
 }) => {
   const [searchTerm, setSearchTerm] = useState('');
   const [lastClickedId, setLastClickedId] = useState<string | null>(null);
+  const [pathInput, setPathInput] = useState(path);
+
+  // Sync path input when prop changes OR refreshKey updates
+  React.useEffect(() => {
+    setPathInput(path);
+  }, [path, refreshKey]);
+
+  const handlePathKeyDown = (e: React.KeyboardEvent) => {
+    if (e.key === 'Enter') {
+      onNavigate(pathInput);
+    } else if (e.key === 'Escape') {
+      setPathInput(path); // Revert
+      (e.target as HTMLInputElement).blur();
+    }
+  };
 
   // Filter files based on search term
   const displayFiles = useMemo(() => {
@@ -82,16 +99,23 @@ const FilePane: React.FC<FilePaneProps> = ({
   };
 
   return (
-    <div className="flex flex-col h-full bg-white border border-slate-300 rounded-lg overflow-hidden shadow-sm">
+    <div className={`flex flex-col h-full bg-white border border-slate-300 rounded-lg overflow-hidden shadow-sm transition-all duration-300 ${!connected ? 'opacity-60 grayscale-[0.5] pointer-events-none' : ''}`}>
       {/* Header */}
       <div className="bg-slate-50 p-2 border-b border-slate-200 flex items-center justify-between">
-        <div className="flex items-center gap-2 text-slate-700 font-semibold text-sm">
+        <div className="flex items-center gap-2 text-slate-700 font-semibold text-sm shrink-0">
           {icon === 'local' ? <Monitor size={16} /> : <Server size={16} />}
           <span>{title}</span>
         </div>
-        <div className="flex items-center gap-2 bg-white px-2 py-1 rounded border border-slate-200 text-xs text-slate-500 flex-1 ml-4 truncate shadow-sm">
-          <span className="text-slate-400">경로:</span>
-          <span className="font-mono text-slate-700 select-all">{path}</span>
+        <div className="flex items-center gap-2 bg-white px-2 py-0.5 rounded border border-slate-200 text-xs text-slate-500 flex-1 ml-4 shadow-sm focus-within:border-blue-500 focus-within:ring-1 focus-within:ring-blue-500 transition-all">
+          <span className="text-slate-400 shrink-0">경로:</span>
+          <input
+            type="text"
+            value={pathInput}
+            onChange={(e) => setPathInput(e.target.value)}
+            onKeyDown={handlePathKeyDown}
+            className="font-mono text-slate-700 w-full outline-none text-xs py-1"
+            spellCheck={false}
+          />
         </div>
       </div>
 
@@ -203,8 +227,7 @@ const FilePane: React.FC<FilePaneProps> = ({
                         setSearchTerm(''); // Clear search on navigate
                       }
                     }}
-                    className={`cursor-pointer border-b border-slate-50 group select-none ${
-                        isSelected 
+                    className={`cursor-pointer border-b border-slate-50 group select-none ${isSelected
                       ? 'bg-blue-100 text-blue-900 border-blue-200'
                       : 'text-slate-700 hover:bg-slate-50'
                       }`}

components/SettingsModal.tsx

@@ -6,177 +6,45 @@ interface SettingsModalProps {
   onClose: () => void;
 }
 
-const SettingsModal: React.FC<SettingsModalProps> = ({ isOpen, onClose }) => {
-  const [activeTab, setActiveTab] = useState<'arch' | 'code'>('arch');
-  const [copied, setCopied] = useState(false);
-
+const SettingsModal: React.FC<SettingsModalProps & { saveConnectionInfo: boolean, onToggleSaveConnectionInfo: (checked: boolean) => void }> = ({
+  isOpen,
+  onClose,
+  saveConnectionInfo,
+  onToggleSaveConnectionInfo
+}) => {
   if (!isOpen) return null;
 
-  const backendCodeDisplay = `/**
- * WebZilla Backend Proxy (Node.js)
- * Supports: FTP (basic-ftp) & SFTP (ssh2-sftp-client)
- * Dependencies: npm install ws basic-ftp ssh2-sftp-client
- */
-const WebSocket = require('ws');
-const ftp = require('basic-ftp');
-const SftpClient = require('ssh2-sftp-client');
-// ... imports
-
-const wss = new WebSocket.Server({ port: 8090 });
-
-wss.on('connection', (ws) => {
-    let ftpClient = new ftp.Client();
-    let sftpClient = new SftpClient();
-    let currentProto = 'ftp';
-    
-    ws.on('message', async (msg) => {
-        const data = JSON.parse(msg);
-        
-        if (data.command === 'CONNECT') {
-            currentProto = data.protocol; // 'ftp' or 'sftp'
-            if (currentProto === 'sftp') {
-                await sftpClient.connect({
-                    host: data.host, 
-                    port: data.port,
-                    username: data.user, 
-                    password: data.pass
-                });
-            } else {
-                await ftpClient.access({
-                   host: data.host, 
-                   user: data.user, 
-                   password: data.pass
-                });
-            }
-            ws.send(JSON.stringify({ status: 'connected' }));
-        }
-        
-        // ... Handling LIST, MKD, DELE for both protocols
-    });
-});`;
-
-  const handleCopy = () => {
-    navigator.clipboard.writeText(backendCodeDisplay);
-    setCopied(true);
-    setTimeout(() => setCopied(false), 2000);
-  };
-
   return (
     <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/20 backdrop-blur-sm p-4">
-      <div className="bg-white border border-slate-200 rounded-lg shadow-2xl w-full max-w-2xl flex flex-col max-h-[85vh]">
+      <div className="bg-white border border-slate-200 rounded-lg shadow-2xl w-full max-w-md flex flex-col">
 
         {/* Header */}
         <div className="flex items-center justify-between p-4 border-b border-slate-200">
           <h2 className="text-lg font-bold text-slate-800 flex items-center gap-2">
             <Server size={20} className="text-blue-600" />
-            시스템 설정 및 아키텍처
+            앱 설정
           </h2>
           <button onClick={onClose} className="text-slate-400 hover:text-slate-600 transition-colors">
             <X size={20} />
           </button>
         </div>
 
-        {/* Tabs */}
-        <div className="flex border-b border-slate-200 px-4">
-          <button
-            onClick={() => setActiveTab('arch')}
-            className={`px-4 py-3 text-sm font-medium border-b-2 transition-colors ${activeTab === 'arch' ? 'border-blue-500 text-blue-600' : 'border-transparent text-slate-500 hover:text-slate-700'
-              }`}
-          >
-            시스템 구조
-          </button>
-          <button
-            onClick={() => setActiveTab('code')}
-            className={`px-4 py-3 text-sm font-medium border-b-2 transition-colors ${activeTab === 'code' ? 'border-blue-500 text-blue-600' : 'border-transparent text-slate-500 hover:text-slate-700'
-              }`}
-          >
-            백엔드 코드 (Preview)
-          </button>
-        </div>
-
         {/* Content */}
-        <div className="p-6 overflow-y-auto flex-1 text-slate-600">
-          {activeTab === 'arch' ? (
-            <div className="space-y-6">
-              <div className="bg-slate-50 p-6 rounded-lg border border-slate-200 flex flex-col md:flex-row items-center justify-between gap-4 text-center">
-                <div className="flex flex-col items-center gap-2">
-                  <div className="w-16 h-16 bg-blue-50 rounded-full flex items-center justify-center border border-blue-200">
-                    <Globe size={32} className="text-blue-500" />
+        <div className="p-6">
+          <label className="flex items-center gap-3 p-4 border border-slate-200 rounded-lg cursor-pointer hover:bg-slate-50 transition-colors">
+            <div className="relative flex items-center">
+              <input
+                type="checkbox"
+                checked={saveConnectionInfo}
+                onChange={(e) => onToggleSaveConnectionInfo(e.target.checked)}
+                className="w-5 h-5 text-blue-600 border-slate-300 rounded focus:ring-blue-500"
+              />
             </div>
-                  <span className="font-bold text-sm text-slate-700">브라우저</span>
-                  <span className="text-xs text-slate-500">React Client</span>
+            <div className="flex-1">
+              <span className="font-semibold text-slate-700 block text-sm">빠른 실행 정보 저장</span>
+              <span className="text-xs text-slate-500">호스트, 사용자명, 포트 정보를 로컬에 저장합니다.</span>
             </div>
-
-                <div className="flex flex-col items-center gap-1 flex-1">
-                  <span className="text-[10px] text-green-600 bg-green-100 px-2 py-0.5 rounded border border-green-200 font-mono">WebSocket</span>
-                  <ArrowLeftRight className="text-slate-400 w-full animate-pulse" />
-                  <span className="text-xs text-slate-400">JSON Protocol</span>
-                </div>
-
-                <div className="flex flex-col items-center gap-2 relative">
-                  <div className="w-16 h-16 bg-green-50 rounded-full flex items-center justify-center border border-green-200">
-                    <Server size={32} className="text-green-500" />
-                  </div>
-                  <span className="font-bold text-sm text-slate-700">Node.js Proxy</span>
-
-                  {/* AppData Connection */}
-                  <div className="absolute -bottom-16 left-1/2 -translate-x-1/2 flex flex-col items-center">
-                    <div className="h-6 w-px border-l border-dashed border-slate-300"></div>
-                    <div className="bg-white border border-slate-300 px-2 py-1 rounded text-[10px] flex items-center gap-1 text-yellow-600 shadow-sm">
-                      <HardDrive size={10} />
-                      AppData/Config
-                    </div>
-                  </div>
-                </div>
-
-                <div className="flex flex-col items-center gap-1 flex-1">
-                  <span className="text-[10px] text-orange-600 bg-orange-100 px-2 py-0.5 rounded border border-orange-200 font-mono">FTP / SFTP</span>
-                  <ArrowLeftRight className="text-slate-400 w-full" />
-                </div>
-
-                <div className="flex flex-col items-center gap-2">
-                  <div className="w-16 h-16 bg-orange-50 rounded-full flex items-center justify-center border border-orange-200">
-                    <Server size={32} className="text-orange-500" />
-                  </div>
-                  <span className="font-bold text-sm text-slate-700">Remote Server</span>
-                </div>
-              </div>
-
-              <div className="space-y-2">
-                <h3 className="font-bold text-slate-800">업데이트 내역 (v1.1)</h3>
-                <ul className="list-disc list-inside text-sm text-slate-600 space-y-1 ml-2">
-                  <li><span className="text-green-600 font-semibold">SFTP 지원:</span> SSH2 프로토콜을 사용한 보안 전송 지원 추가.</li>
-                  <li><span className="text-blue-600 font-semibold">패시브 모드:</span> 방화벽 환경을 위한 FTP 패시브 모드 토글 UI 추가.</li>
-                  <li><span className="text-yellow-600 font-semibold">파일 작업:</span> 폴더 생성, 이름 변경, 삭제를 위한 전용 모달 인터페이스 구현.</li>
-                </ul>
-              </div>
-            </div>
-          ) : (
-            <div className="space-y-4">
-              <div className="flex items-center justify-between">
-                <p className="text-sm text-slate-500">
-                  SFTP와 FTP를 모두 지원하는 프록시 서버 코드 미리보기입니다.
-                </p>
-                <button
-                  onClick={handleCopy}
-                  className="flex items-center gap-1.5 px-3 py-1.5 bg-blue-600 hover:bg-blue-500 text-white rounded text-xs font-medium transition-colors shadow-sm"
-                >
-                  {copied ? <Check size={14} /> : <Copy size={14} />}
-                  {copied ? '복사됨' : '코드 복사'}
-                </button>
-              </div>
-
-              <div className="relative group">
-                <pre className="bg-slate-800 p-4 rounded-lg overflow-x-auto text-xs font-mono text-slate-200 border border-slate-700 leading-relaxed shadow-inner">
-                  {backendCodeDisplay}
-                </pre>
-              </div>
-
-              <p className="text-xs text-slate-400 italic text-center">
-                전체 코드는 메인 화면의 '백엔드 다운로드' 버튼을 통해 받으실 수 있습니다.
-              </p>
-            </div>
-          )}
+          </label>
         </div>
 
         <div className="p-4 border-t border-slate-200 bg-slate-50 rounded-b-lg flex justify-end">