fix: resolve IDE errors, minor UI tweaks, and implement file conflict resolution UI/API

backend/handlers/files.go

@@ -433,14 +433,18 @@ func (h *FSHandler) Move(c *fiber.Ctx) error {
 		uniqueName := GetUniquePath(dstFull, filepath.Base(srcFull))
 		dstFull = filepath.Join(dstFull, uniqueName)
 		body.DestPath = filepath.Join(body.DestPath, uniqueName)
-	} else {
+	} else if err == nil {
-		// If destination is not a directory but the file exists (rename), we don't overwrite if they want `(1)`
+		if body.Resolution == "skip" {
-		// Wait, if they intentionally rename to an existing file, should it append (1)?
+			return c.JSON(fiber.Map{"message": "skipped"})
-		// Yes, to prevent accidental overwrites.
+		}
+		if body.Resolution != "overwrite" {
 			parentDir := filepath.Dir(dstFull)
 			uniqueName := GetUniquePath(parentDir, filepath.Base(dstFull))
 			dstFull = filepath.Join(parentDir, uniqueName)
 			body.DestPath = filepath.Join(filepath.Dir(body.DestPath), uniqueName)
+		} else {
+			os.RemoveAll(dstFull)
+		}
 	}
 
 	if err := os.Rename(srcFull, dstFull); err != nil {
@@ -457,13 +461,16 @@ func (h *FSHandler) Move(c *fiber.Ctx) error {
 	return c.JSON(fiber.Map{"message": "moved successfully"})
 }
 
+type CopyRequest struct {
+	SourcePath string `json:"source_path"`
+	DestPath   string `json:"dest_path"`
+	Resolution string `json:"resolution"` // "overwrite", "rename", "skip"
+}
+
 // Copy copies a file or folder.
 // POST /api/files/copy
 func (h *FSHandler) Copy(c *fiber.Ctx) error {
-	var body struct {
+	var body CopyRequest
-		SourcePath string `json:"source_path"`
-		DestPath   string `json:"dest_path"`
-	}
 	if err := c.BodyParser(&body); err != nil {
 		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "invalid request body"})
 	}
@@ -483,12 +490,27 @@ func (h *FSHandler) Copy(c *fiber.Ctx) error {
 		return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "source not found"})
 	}
 
+	// Handle conflict
+	finalDst := dstFull
+	if _, err := os.Stat(dstFull); err == nil {
+		if body.Resolution == "skip" {
+			return c.JSON(fiber.Map{"message": "skipped"})
+		}
+		if body.Resolution != "overwrite" {
+			parentDir := filepath.Dir(dstFull)
+			uniqueName := GetUniquePath(parentDir, filepath.Base(dstFull))
+			finalDst = filepath.Join(parentDir, uniqueName)
+		} else {
+			os.RemoveAll(dstFull)
+		}
+	}
+
 	if info.IsDir() {
-		if err := copyDir(srcFull, dstFull); err != nil {
+		if err := copyDir(srcFull, finalDst); err != nil {
 			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "failed to copy directory"})
 		}
 	} else {
-		if err := copyFile(srcFull, dstFull); err != nil {
+		if err := copyFile(srcFull, finalDst); err != nil {
 			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "failed to copy file"})
 		}
 	}
@@ -516,6 +538,16 @@ func (h *FSHandler) Delete(c *fiber.Ctx) error {
 		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": "failed to prepare trash"})
 	}
 
+	info, err := os.Stat(resolvedPath)
+	isDir := 0
+	size := int64(0)
+	if err == nil {
+		if info.IsDir() {
+			isDir = 1
+		}
+		size = info.Size()
+	}
+
 	if err := os.Rename(resolvedPath, trashPath); err != nil {
 		fmt.Printf("Rename error %s -> %s: %v. Attempting copy & delete fallback...\n", resolvedPath, trashPath, err)
 		if err := copyFile(resolvedPath, trashPath); err != nil {
@@ -527,14 +559,14 @@ func (h *FSHandler) Delete(c *fiber.Ctx) error {
 	// Update DB
 	cleanPath := filepath.ToSlash(relativePath)
 	h.DB.Exec(
-		`UPDATE files SET is_trashed = 1, trashed_at = CURRENT_TIMESTAMP, original_path = ? WHERE path = ?`,
+		`UPDATE files SET is_trashed = 1, trashed_at = CURRENT_TIMESTAMP, original_path = ?, is_dir = ?, size = ? WHERE path = ?`,
-		cleanPath, cleanPath,
+		cleanPath, isDir, size, cleanPath,
 	)
 
 	// Also insert if not tracked
 	h.DB.Exec(
-		`INSERT OR IGNORE INTO files (path, name, is_trashed, trashed_at, original_path) VALUES (?, ?, 1, CURRENT_TIMESTAMP, ?)`,
+		`INSERT OR IGNORE INTO files (path, name, is_trashed, trashed_at, original_path, is_dir, size) VALUES (?, ?, 1, CURRENT_TIMESTAMP, ?, ?, ?)`,
-		cleanPath, filepath.Base(cleanPath), cleanPath,
+		cleanPath, filepath.Base(cleanPath), cleanPath, isDir, size,
 	)
 
 	h.DB.AddAuditLog("deleted", cleanPath, c.IP())
@@ -1153,3 +1185,32 @@ func (h *FSHandler) ServeThumbnail(c *fiber.Ctx) error {
 	
 	return c.SendFile(thumbPath)
 }
+
+type CheckConflictsRequest struct {
+	DestPath string   `json:"dest_path"`
+	Files    []string `json:"files"`
+}
+
+// CheckConflicts checks if files exist in the destination.
+// POST /api/files/check-conflicts
+func (h *FSHandler) CheckConflicts(c *fiber.Ctx) error {
+	var req CheckConflictsRequest
+	if err := c.BodyParser(&req); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "invalid body"})
+	}
+
+	destFull, err := resolveSafe(h.Config.StorageDir, req.DestPath)
+	if err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "invalid path"})
+	}
+
+	conflicts := []string{}
+	for _, file := range req.Files {
+		filePath := filepath.Join(destFull, file)
+		if _, err := os.Stat(filePath); err == nil {
+			conflicts = append(conflicts, file)
+		}
+	}
+
+	return c.JSON(fiber.Map{"conflicts": conflicts})
+}

backend/handlers/tus.go

@@ -107,6 +107,7 @@ func (h *TusHandler) Create(c *fiber.Ctx) error {
 	metadata := parseTusMetadata(c.Get("Upload-Metadata"))
 	fileName := metadata["filename"]
 	destPath := metadata["path"]
+	overwrite := metadata["overwrite"] == "true"
 
 	if fileName == "" {
 		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "filename metadata is required"})
@@ -115,13 +116,15 @@ func (h *TusHandler) Create(c *fiber.Ctx) error {
 		destPath = "."
 	}
 
-	// Resolve destination directory and ensure unique filename
 	destFull, err := resolveSafe(h.Config.StorageDir, destPath)
 	if err != nil {
 		return c.Status(fiber.StatusForbidden).JSON(fiber.Map{"error": "invalid destination path"})
 	}
 
-	uniqueFileName := GetUniquePath(destFull, fileName)
+	uniqueFileName := fileName
+	if !overwrite {
+		uniqueFileName = GetUniquePath(destFull, fileName)
+	}
 
 	// Generate unique upload ID
 	uploadID, err := generateUploadID()

backend/main.go

@@ -181,6 +181,7 @@ func main() {
 	protected.Post("/files/move", fsHandler.Move)
 	protected.Post("/files/copy", fsHandler.Copy)
 	protected.Post("/files/upload", fsHandler.Upload)
+	protected.Post("/files/check-conflicts", fsHandler.CheckConflicts)
 
 	protected.Get("/files/folders-tree", fsHandler.GetFolderTree)
 

frontend/src/components/FileExplorer.tsx

@@ -98,10 +98,13 @@ function FolderTreeNode({
 type ViewMode = 'grid' | 'list';
 type SidebarSection = 'files' | 'trash' | 'storage' | 'settings' | 'shared';
 
-interface UploadProgress {
+interface UploadBatch {
   id: string;
   name: string;
-  progress: number;
+  totalBytes: number;
+  uploadedBytes: number;
+  totalFiles: number;
+  filesUploaded: number;
   status: 'uploading' | 'complete' | 'error';
   error?: string;
 }
@@ -242,9 +245,16 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
   const [sortBy, setSortBy] = useState<'name' | 'size' | 'date' | 'type'>('name');
   const [sortAsc, setSortAsc] = useState(true);
   const [draggedFile, setDraggedFile] = useState<string | null>(null);
-  const [uploads, setUploads] = useState<UploadProgress[]>([]);
+  const [uploads, setUploads] = useState<UploadBatch[]>([]);
   const [toasts, setToasts] = useState<Toast[]>([]);
   const [deleteConfirm, setDeleteConfirm] = useState<{ type: 'single' | 'multiple'; file?: FileItem; count?: number } | null>(null);
+  const [conflictState, setConflictState] = useState<{
+    type: 'upload' | 'move' | 'copy';
+    files?: {file: File, path: string}[];
+    sourcePaths?: string[];
+    destPath: string;
+    conflicts: string[];
+  } | null>(null);
 
   function showToast(message: string, type: 'success' | 'error' | 'info' = 'success') {
     const id = Date.now() + Math.random();
@@ -688,7 +698,14 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
   async function handleMoveExecute() {
     if (movingFiles.length === 0) return;
     try {
-      await Promise.all(movingFiles.map(src => api.move(src, moveModalPath === '.' ? '.' : moveModalPath)));
+      const destPath = moveModalPath === '.' ? '.' : moveModalPath;
+      const fileNames = movingFiles.map(src => src.split('/').pop() || src);
+      const res = await api.checkConflicts(destPath, fileNames);
+      if (res.conflicts?.length) {
+        setConflictState({ type: 'move', sourcePaths: movingFiles, destPath, conflicts: res.conflicts });
+        return;
+      }
+      await Promise.all(movingFiles.map(src => api.move(src, destPath)));
       setShowMoveModal(false);
       setMovingFiles([]);
       loadFiles(undefined, true);
@@ -699,6 +716,59 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
     }
   }
 
+  async function handleDropOnFolder(file: FileItem, targetFolder: FileItem) {
+    if (file.path === targetFolder.path) return;
+    try {
+      const res = await api.checkConflicts(targetFolder.path, [file.name]);
+      if (res.conflicts?.length) {
+        setConflictState({ type: 'move', sourcePaths: [file.path], destPath: targetFolder.path, conflicts: res.conflicts });
+        return;
+      }
+      await api.move(file.path, targetFolder.path);
+      loadFiles();
+      showToast(`Moved ${file.name}`);
+    } catch (err) {
+      console.error(err);
+    }
+  }
+
+  async function executeConflictResolution(resolution: string) {
+    if (!conflictState) return;
+    const { type, destPath, conflicts } = conflictState;
+
+    if (type === 'upload' && conflictState.files) {
+      let filesToUpload = conflictState.files;
+      if (resolution === 'skip') {
+        filesToUpload = filesToUpload.filter(f => {
+          const name = f.path ? `${f.path}/${f.file.name}` : f.file.name;
+          return !conflicts.includes(name);
+        });
+      }
+      setConflictState(null);
+      if (filesToUpload.length > 0) {
+        processUploadBatch(filesToUpload, destPath, resolution === 'overwrite');
+      }
+    } else if (type === 'move' && conflictState.sourcePaths) {
+      let pathsToMove = conflictState.sourcePaths;
+      if (resolution === 'skip') {
+        pathsToMove = pathsToMove.filter(p => !conflicts.includes(p.split('/').pop()!));
+      }
+      setConflictState(null);
+      if (pathsToMove.length > 0) {
+        try {
+          await Promise.all(pathsToMove.map(src => api.move(src, destPath, resolution)));
+          setShowMoveModal(false);
+          setMovingFiles([]);
+          loadFiles(undefined, true);
+          setSelectedFiles(new Set());
+          showToast(`Moved ${pathsToMove.length} item${pathsToMove.length > 1 ? 's' : ''}`);
+        } catch (e) {
+          console.error(e);
+        }
+      }
+    }
+  }
+
   function handleDragOver(e: React.DragEvent) {
     if (draggedFile) return;
     if (!e.dataTransfer.types.includes('Files')) return;
@@ -748,23 +818,72 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
     }
   }
 
-  async function uploadFile(file: File, targetDir?: string) {
+  async function processUploadBatch(entries: {file: File, path: string}[], destPath: string, overwrite: boolean = false) {
-    const id = `${Date.now()}-${file.name}`;
+    if (!entries.length) return;
-    setUploads(prev => [...prev, { id, name: file.name, progress: 0, status: 'uploading' }]);
+    const batchId = 'batch-' + Date.now();
+    const totalFiles = entries.length;
+    const totalBytes = entries.reduce((acc, curr) => acc + curr.file.size, 0);
+    const batchName = totalFiles === 1 ? entries[0].file.name : `Uploading ${totalFiles} items`;
+
+    setUploads(prev => [...prev, {
+      id: batchId,
+      name: batchName,
+      totalBytes,
+      uploadedBytes: 0,
+      totalFiles,
+      filesUploaded: 0,
+      status: 'uploading'
+    }]);
+
+    const MAX_CONCURRENT = 4;
+    let currentIndex = 0;
+    let completedFiles = 0;
+    const fileProgressMap = new Map<string, number>();
+
+    const updateProgress = () => {
+      let totalUploaded = 0;
+      fileProgressMap.forEach(bytes => { totalUploaded += bytes; });
+      setUploads(prev => prev.map(b => b.id === batchId ? {
+        ...b,
+        uploadedBytes: totalUploaded,
+        filesUploaded: completedFiles,
+        status: completedFiles === totalFiles ? 'complete' : 'uploading'
+      } : b));
+    };
+
+    const worker = async () => {
+      while (currentIndex < entries.length) {
+        const index = currentIndex++;
+        const { file, path } = entries[index];
+        const uploadPath = path ? (destPath === '.' ? path : `${destPath}/${path}`) : destPath;
+        
         try {
-      const uploadPath = targetDir ? (currentPath === '.' ? targetDir : `${currentPath}/${targetDir}`) : currentPath;
           await api.upload(file, uploadPath, {
+            overwrite,
             onProgress: (percent) => {
-          setUploads(prev => prev.map(u => u.id === id ? { ...u, progress: percent } : u));
+              fileProgressMap.set(file.name + path, (percent / 100) * file.size);
-        },
+              updateProgress();
-      });
-      setUploads(prev => prev.map(u => u.id === id ? { ...u, progress: 100, status: 'complete' } : u));
-      setTimeout(() => {
-        setUploads(prev => prev.filter(u => u.id !== id));
-      }, 3000);
-    } catch (err: any) {
-      setUploads(prev => prev.map(u => u.id === id ? { ...u, status: 'error', error: err.message || 'Upload failed' } : u));
             }
+          });
+          completedFiles++;
+          fileProgressMap.set(file.name + path, file.size);
+          updateProgress();
+        } catch (err: any) {
+          setUploads(prev => prev.map(b => b.id === batchId ? { ...b, status: 'error', error: err.message || 'Upload failed' } : b));
+        }
+      }
+    };
+
+    const workers = [];
+    for (let i = 0; i < Math.min(MAX_CONCURRENT, entries.length); i++) {
+      workers.push(worker());
+    }
+    await Promise.all(workers);
+
+    setTimeout(() => {
+      setUploads(prev => prev.filter(u => u.id !== batchId));
+      loadFiles(undefined, true);
+    }, 3000);
   }
 
   async function handleDrop(e: React.DragEvent) {
@@ -779,7 +898,7 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
       const processEntry = async (entry: any, path: string = '') => {
         if (entry.isFile) {
           const file = await new Promise<File>((resolve) => entry.file(resolve));
-          filesToUpload.push({ file, path });
+          filesToUpload.push({ file, path: path.replace(/\/$/, '') });
         } else if (entry.isDirectory) {
           const dirReader = entry.createReader();
           let entries: any[] = [];
@@ -812,24 +931,58 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
       await Promise.all(promises);
       
       if (filesToUpload.length > 0) {
-        await Promise.all(filesToUpload.map(({file, path}) => 
+        // Collect destination paths to create folders
-          uploadFile(file, path.replace(/\/$/, ''))
+        const uniqueDirs = new Set<string>();
-        ));
+        filesToUpload.forEach(({path}) => {
-      }
+          if (path) uniqueDirs.add(currentPath === '.' ? path : `${currentPath}/${path}`);
-    } else {
+        });
-      const droppedFiles = Array.from(e.dataTransfer.files);
+        
-      await Promise.all(droppedFiles.map(file => uploadFile(file)));
+        for (const dir of Array.from(uniqueDirs)) {
+          try { await api.createFolder(dir); } catch {}
         }
 
-    loadFiles(undefined, true);
+        const fileNames = filesToUpload.map(f => f.path ? `${f.path}/${f.file.name}` : f.file.name);
+        try {
+          const res = await api.checkConflicts(currentPath, fileNames);
+          if (res.conflicts && res.conflicts.length > 0) {
+            setConflictState({ type: 'upload', files: filesToUpload, destPath: currentPath, conflicts: res.conflicts });
+            return;
+          }
+        } catch {}
+
+        processUploadBatch(filesToUpload, currentPath);
+      }
+    } else {
+      const droppedFiles = Array.from(e.dataTransfer.files).map(f => ({ file: f, path: '' }));
+      const fileNames = droppedFiles.map(f => f.file.name);
+      try {
+        const res = await api.checkConflicts(currentPath, fileNames);
+        if (res.conflicts && res.conflicts.length > 0) {
+          setConflictState({ type: 'upload', files: droppedFiles, destPath: currentPath, conflicts: res.conflicts });
+          return;
+        }
+      } catch {}
+      processUploadBatch(droppedFiles, currentPath);
+    }
   }
 
   async function handleFileUpload(e: React.ChangeEvent<HTMLInputElement>) {
     const uploadFiles = e.target.files;
     if (!uploadFiles) return;
-    await Promise.all(Array.from(uploadFiles).map(file => uploadFile(file)));
+    const filesArray = Array.from(uploadFiles).map(f => ({ file: f, path: '' }));
+    
+    const fileNames = filesArray.map(f => f.file.name);
+    try {
+      const res = await api.checkConflicts(currentPath, fileNames);
+      if (res.conflicts && res.conflicts.length > 0) {
+        setConflictState({ type: 'upload', files: filesArray, destPath: currentPath, conflicts: res.conflicts });
+        e.target.value = '';
+        return;
+      }
+    } catch {}
+
+    processUploadBatch(filesArray, currentPath);
     e.target.value = '';
-    loadFiles(undefined, true);
   }
 
   const pathSegments = currentPath === '.' ? [] : currentPath.split('/');
@@ -1998,6 +2151,44 @@ export default function FileExplorer({ onLogout }: FileExplorerProps) {
       </AnimatePresence>
 
       <AnimatePresence>
+        {conflictState && (
+          <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/40 backdrop-blur-sm" onClick={() => setConflictState(null)}>
+            <motion.div
+              initial={{ opacity: 0, scale: 0.95 }}
+              animate={{ opacity: 1, scale: 1 }}
+              className="w-full max-w-md rounded-2xl shadow-xl overflow-hidden flex flex-col"
+              style={{ backgroundColor: 'var(--color-bg-primary)', border: '1px solid var(--color-border)', maxHeight: '90vh' }}
+              onClick={e => e.stopPropagation()}
+            >
+              <div className="p-6 border-b" style={{ borderColor: 'var(--color-border)' }}>
+                <h2 className="text-xl font-semibold" style={{ color: 'var(--color-text-primary)' }}>Name Conflict Detected</h2>
+                <p className="mt-1 text-sm" style={{ color: 'var(--color-text-secondary)' }}>
+                  The following files already exist in the destination. How would you like to proceed?
+                </p>
+              </div>
+              <div className="overflow-y-auto p-6 text-sm flex-1" style={{ backgroundColor: 'var(--color-bg-secondary)', color: 'var(--color-text-secondary)' }}>
+                <ul className="list-disc pl-4 space-y-1">
+                  {conflictState.conflicts.map(c => <li key={c} className="break-all">{c}</li>)}
+                </ul>
+              </div>
+              <div className="p-6 flex flex-col gap-3 border-t" style={{ borderColor: 'var(--color-border)' }}>
+                <button onClick={() => executeConflictResolution('overwrite')} className="w-full py-2.5 rounded-xl font-medium text-white shadow-sm transition-opacity hover:opacity-90 bg-red-500">
+                  Replace
+                </button>
+                <button onClick={() => executeConflictResolution('rename')} className="w-full py-2.5 rounded-xl font-medium text-white shadow-sm transition-opacity hover:opacity-90" style={{ backgroundColor: 'var(--color-accent)' }}>
+                  Auto-Rename (Keep Both)
+                </button>
+                <button onClick={() => executeConflictResolution('skip')} className="w-full py-2.5 rounded-xl font-medium shadow-sm transition-opacity hover:opacity-90" style={{ backgroundColor: 'var(--color-bg-elevated)', color: 'var(--color-text-primary)' }}>
+                  Skip Conflicting
+                </button>
+                <button onClick={() => setConflictState(null)} className="w-full py-2.5 rounded-xl font-medium shadow-sm transition-opacity hover:opacity-90 border" style={{ borderColor: 'var(--color-border)', color: 'var(--color-text-primary)' }}>
+                  Cancel
+                </button>
+              </div>
+            </motion.div>
+          </div>
+        )}
+
         {showMoveModal && (
           <div className="fixed inset-0 z-[120] flex items-center justify-center bg-black/50 backdrop-blur-sm">
             <motion.div

frontend/src/components/LoginPage.tsx

@@ -204,7 +204,7 @@ export default function LoginPage({ onSuccess }: LoginPageProps) {
                   }}
                 />
                 <span className="text-sm" style={{ color: 'var(--color-text-secondary)' }}>
-                  Remember me for 3 weeks
+                  Remember me
                 </span>
               </label>
             )}

frontend/src/lib/api.ts

@@ -146,6 +146,14 @@ class ApiClient {
   }
 
   // --- Files ---
+  async checkConflicts(destPath: string, files: string[]) {
+    const res = await this.request('/api/files/check-conflicts', {
+      method: 'POST',
+      body: { dest_path: destPath, files },
+    });
+    return res.json();
+  }
+
   async listDirectory(path: string = '.') {
     const res = await this.request(`/api/files/?path=${encodeURIComponent(path)}`);
     return res.json();
@@ -177,18 +185,18 @@ class ApiClient {
     return res.json();
   }
 
-  async move(sourcePath: string, destPath: string) {
+  async move(sourcePath: string, destPath: string, resolution: string = "rename") {
     const res = await this.request('/api/files/move', {
       method: 'POST',
-      body: { source_path: sourcePath, dest_path: destPath },
+      body: { source_path: sourcePath, dest_path: destPath, resolution },
     });
     return res.json();
   }
 
-  async copy(sourcePath: string, destPath: string) {
+  async copy(sourcePath: string, destPath: string, resolution: string = "rename") {
     const res = await this.request('/api/files/copy', {
       method: 'POST',
-      body: { source_path: sourcePath, dest_path: destPath },
+      body: { source_path: sourcePath, dest_path: destPath, resolution },
     });
     return res.json();
   }
@@ -200,7 +208,7 @@ class ApiClient {
     return res.json();
   }
 
-  upload(file: File, destPath: string, callbacks?: { onProgress?: (percent: number) => void }): Promise<void> {
+  upload(file: File, destPath: string, options?: { onProgress?: (percent: number) => void, overwrite?: boolean }): Promise<void> {
     return new Promise((resolve, reject) => {
       const upload = new tus.Upload(file, {
         endpoint: `${API_BASE}/api/tus/`,
@@ -211,13 +219,14 @@ class ApiClient {
           filename: file.name,
           filetype: file.type,
           path: destPath,
+          overwrite: options?.overwrite ? "true" : "false",
         },
         onError: function (error) {
           reject(error);
         },
         onProgress: function (bytesUploaded, bytesTotal) {
           const percentage = (bytesUploaded / bytesTotal) * 100;
-          callbacks?.onProgress?.(percentage);
+          options?.onProgress?.(percentage);
         },
         onSuccess: function () {
           resolve();

refactor.js

@@ -0,0 +1,302 @@
+const fs = require('fs');
+
+let content = fs.readFileSync('frontend/src/components/FileExplorer.tsx', 'utf-8');
+
+// 1. Add ConflictState to the component state
+const stateInsertPos = content.indexOf('  const [deleteConfirm');
+const conflictStateCode = `  const [conflictState, setConflictState] = useState<{
+    type: 'upload' | 'move' | 'copy';
+    files?: {file: File, path: string}[];
+    sourcePaths?: string[];
+    destPath: string;
+    conflicts: string[];
+  } | null>(null);\n`;
+content = content.slice(0, stateInsertPos) + conflictStateCode + content.slice(stateInsertPos);
+
+// 2. Replace handleDrop and uploadFile with processUploadBatch and updated handleDrop
+const uploadFileStart = content.indexOf('  async function uploadFile');
+const handleCreateFolderStart = content.indexOf('  async function handleCreateFolder');
+
+const newUploadCode = `  async function processUploadBatch(entries: {file: File, path: string}[], destPath: string, overwrite: boolean = false) {
+    if (!entries.length) return;
+    const batchId = 'batch-' + Date.now();
+    const totalFiles = entries.length;
+    const totalBytes = entries.reduce((acc, curr) => acc + curr.file.size, 0);
+    const batchName = totalFiles === 1 ? entries[0].file.name : \`Uploading \${totalFiles} items\`;
+
+    setUploads(prev => [...prev, {
+      id: batchId,
+      name: batchName,
+      totalBytes,
+      uploadedBytes: 0,
+      totalFiles,
+      filesUploaded: 0,
+      status: 'uploading'
+    }]);
+
+    const MAX_CONCURRENT = 4;
+    let currentIndex = 0;
+    let completedFiles = 0;
+    let currentUploadedBytes = 0;
+    const fileProgressMap = new Map<string, number>();
+
+    const updateProgress = () => {
+      let totalUploaded = 0;
+      fileProgressMap.forEach(bytes => { totalUploaded += bytes; });
+      setUploads(prev => prev.map(b => b.id === batchId ? {
+        ...b,
+        uploadedBytes: totalUploaded,
+        filesUploaded: completedFiles,
+        status: completedFiles === totalFiles ? 'complete' : 'uploading'
+      } : b));
+    };
+
+    const worker = async () => {
+      while (currentIndex < entries.length) {
+        const index = currentIndex++;
+        const { file, path } = entries[index];
+        const uploadPath = path ? (destPath === '.' ? path : \`\${destPath}/\${path}\`) : destPath;
+        
+        try {
+          await api.upload(file, uploadPath, {
+            overwrite,
+            onProgress: (percent) => {
+              fileProgressMap.set(file.name + path, (percent / 100) * file.size);
+              updateProgress();
+            }
+          });
+          completedFiles++;
+          fileProgressMap.set(file.name + path, file.size);
+          updateProgress();
+        } catch (err: any) {
+          setUploads(prev => prev.map(b => b.id === batchId ? { ...b, status: 'error', error: err.message || 'Upload failed' } : b));
+        }
+      }
+    };
+
+    const workers = [];
+    for (let i = 0; i < Math.min(MAX_CONCURRENT, entries.length); i++) {
+      workers.push(worker());
+    }
+    await Promise.all(workers);
+
+    setTimeout(() => {
+      setUploads(prev => prev.filter(u => u.id !== batchId));
+      loadFiles(undefined, true);
+    }, 3000);
+  }
+
+  async function handleDrop(e: React.DragEvent) {
+    e.preventDefault();
+    setDragOver(false);
+    if (draggedFile) return;
+
+    if (e.dataTransfer.items) {
+      const filesToUpload: { file: File; path: string }[] = [];
+      const promises: Promise<void>[] = [];
+
+      const processEntry = async (entry: any, path: string = '') => {
+        if (entry.isFile) {
+          const file = await new Promise<File>((resolve) => entry.file(resolve));
+          filesToUpload.push({ file, path: path.replace(/\\/$/, '') });
+        } else if (entry.isDirectory) {
+          const dirReader = entry.createReader();
+          let entries: any[] = [];
+          
+          const readAllEntries = async () => {
+            const batch = await new Promise<any[]>((resolve) => dirReader.readEntries(resolve));
+            if (batch.length > 0) {
+              entries = entries.concat(batch);
+              await readAllEntries();
+            }
+          };
+          await readAllEntries();
+          
+          for (const child of entries) {
+            await processEntry(child, \`\${path}\${entry.name}/\`);
+          }
+        }
+      };
+
+      for (let i = 0; i < e.dataTransfer.items.length; i++) {
+        const item = e.dataTransfer.items[i];
+        if (item.kind === 'file') {
+          const entry = item.webkitGetAsEntry();
+          if (entry) {
+            promises.push(processEntry(entry));
+          }
+        }
+      }
+
+      await Promise.all(promises);
+      
+      if (filesToUpload.length > 0) {
+        // Collect destination paths to create folders
+        const uniqueDirs = new Set<string>();
+        filesToUpload.forEach(({path}) => {
+          if (path) uniqueDirs.add(currentPath === '.' ? path : \`\${currentPath}/\${path}\`);
+        });
+        
+        for (const dir of Array.from(uniqueDirs)) {
+          try { await api.createFolder(dir); } catch {}
+        }
+
+        const fileNames = filesToUpload.map(f => f.path ? \`\${f.path}/\${f.file.name}\` : f.file.name);
+        try {
+          const res = await api.checkConflicts(currentPath, fileNames);
+          if (res.conflicts && res.conflicts.length > 0) {
+            setConflictState({ type: 'upload', files: filesToUpload, destPath: currentPath, conflicts: res.conflicts });
+            return;
+          }
+        } catch {}
+
+        processUploadBatch(filesToUpload, currentPath);
+      }
+    }
+  }
+
+  async function handleFileUpload(e: React.ChangeEvent<HTMLInputElement>) {
+    const uploadFiles = e.target.files;
+    if (!uploadFiles) return;
+    const filesArray = Array.from(uploadFiles).map(f => ({ file: f, path: '' }));
+    
+    const fileNames = filesArray.map(f => f.file.name);
+    try {
+      const res = await api.checkConflicts(currentPath, fileNames);
+      if (res.conflicts && res.conflicts.length > 0) {
+        setConflictState({ type: 'upload', files: filesArray, destPath: currentPath, conflicts: res.conflicts });
+        return;
+      }
+    } catch {}
+
+    processUploadBatch(filesArray, currentPath);
+  }
+
+`;
+
+content = content.slice(0, uploadFileStart) + newUploadCode + content.slice(handleCreateFolderStart);
+
+// Add Conflict Modal rendering
+const renderModalsPos = content.lastIndexOf('{showMoveModal && (');
+const conflictModalCode = `
+      {conflictState && (
+        <div className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/40 backdrop-blur-sm" onClick={() => setConflictState(null)}>
+          <motion.div
+            initial={{ opacity: 0, scale: 0.95 }}
+            animate={{ opacity: 1, scale: 1 }}
+            className="w-full max-w-md rounded-2xl shadow-xl overflow-hidden flex flex-col"
+            style={{ backgroundColor: 'var(--color-bg-primary)', border: '1px solid var(--color-border)', maxHeight: '90vh' }}
+            onClick={e => e.stopPropagation()}
+          >
+            <div className="p-6 border-b" style={{ borderColor: 'var(--color-border)' }}>
+              <h2 className="text-xl font-semibold" style={{ color: 'var(--color-text-primary)' }}>Name Conflict Detected</h2>
+              <p className="mt-1 text-sm" style={{ color: 'var(--color-text-secondary)' }}>
+                The following files already exist in the destination. How would you like to proceed?
+              </p>
+            </div>
+            <div className="overflow-y-auto p-6 text-sm flex-1" style={{ backgroundColor: 'var(--color-bg-secondary)', color: 'var(--color-text-secondary)' }}>
+              <ul className="list-disc pl-4 space-y-1">
+                {conflictState.conflicts.map(c => <li key={c} className="break-all">{c}</li>)}
+              </ul>
+            </div>
+            <div className="p-6 flex flex-col gap-3 border-t" style={{ borderColor: 'var(--color-border)' }}>
+              <button onClick={() => executeConflictResolution('overwrite')} className="w-full py-2.5 rounded-xl font-medium text-white shadow-sm transition-opacity hover:opacity-90 bg-red-500">
+                Replace
+              </button>
+              <button onClick={() => executeConflictResolution('rename')} className="w-full py-2.5 rounded-xl font-medium text-white shadow-sm transition-opacity hover:opacity-90" style={{ backgroundColor: 'var(--color-accent)' }}>
+                Auto-Rename (Keep Both)
+              </button>
+              <button onClick={() => executeConflictResolution('skip')} className="w-full py-2.5 rounded-xl font-medium shadow-sm transition-opacity hover:opacity-90" style={{ backgroundColor: 'var(--color-bg-elevated)', color: 'var(--color-text-primary)' }}>
+                Skip Conflicting
+              </button>
+              <button onClick={() => setConflictState(null)} className="w-full py-2.5 rounded-xl font-medium shadow-sm transition-opacity hover:opacity-90 border" style={{ borderColor: 'var(--color-border)', color: 'var(--color-text-primary)' }}>
+                Cancel
+              </button>
+            </div>
+          </motion.div>
+        </div>
+      )}
+`;
+content = content.slice(0, renderModalsPos) + conflictModalCode + content.slice(renderModalsPos);
+
+// Add executeConflictResolution function
+const execFunctionCode = `
+  async function executeConflictResolution(resolution: string) {
+    if (!conflictState) return;
+    const { type, destPath, conflicts } = conflictState;
+
+    if (type === 'upload' && conflictState.files) {
+      let filesToUpload = conflictState.files;
+      if (resolution === 'skip') {
+        filesToUpload = filesToUpload.filter(f => {
+          const name = f.path ? \`\${f.path}/\${f.file.name}\` : f.file.name;
+          return !conflicts.includes(name);
+        });
+      }
+      setConflictState(null);
+      if (filesToUpload.length > 0) {
+        processUploadBatch(filesToUpload, destPath, resolution === 'overwrite');
+      }
+    } else if (type === 'move' && conflictState.sourcePaths) {
+      let pathsToMove = conflictState.sourcePaths;
+      if (resolution === 'skip') {
+        pathsToMove = pathsToMove.filter(p => !conflicts.includes(p.split('/').pop()!));
+      }
+      setConflictState(null);
+      if (pathsToMove.length > 0) {
+        try {
+          await Promise.all(pathsToMove.map(src => api.move(src, destPath, resolution)));
+          setShowMoveModal(false);
+          setMovingFiles([]);
+          loadFiles(undefined, true);
+          setSelectedFiles(new Set());
+          showToast(\`Moved \${pathsToMove.length} item\${pathsToMove.length > 1 ? 's' : ''}\`);
+        } catch (e) {
+          console.error(e);
+        }
+      }
+    }
+  }
+
+`;
+
+const handleDropOnFolderStart = content.indexOf('  async function handleDropOnFolder');
+content = content.slice(0, handleDropOnFolderStart) + execFunctionCode + content.slice(handleDropOnFolderStart);
+
+// Update handleMoveExecute
+content = content.replace(
+  \`  async function handleMoveExecute() {
+    if (movingFiles.length === 0) return;
+    try {
+      await Promise.all(movingFiles.map(src => api.move(src, moveModalPath === '.' ? '.' : moveModalPath)));\`,
+  \`  async function handleMoveExecute() {
+    if (movingFiles.length === 0) return;
+    try {
+      const destPath = moveModalPath === '.' ? '.' : moveModalPath;
+      const fileNames = movingFiles.map(src => src.split('/').pop() || src);
+      const res = await api.checkConflicts(destPath, fileNames);
+      if (res.conflicts && res.conflicts.length > 0) {
+        setConflictState({ type: 'move', sourcePaths: movingFiles, destPath, conflicts: res.conflicts });
+        return;
+      }
+      await Promise.all(movingFiles.map(src => api.move(src, destPath)));\`
+);
+
+// Update handleDropOnFolder
+content = content.replace(
+  \`  async function handleDropOnFolder(file: FileItem, targetFolder: FileItem) {
+    if (file.path === targetFolder.path) return;
+    try {
+      await api.move(file.path, targetFolder.path);\`,
+  \`  async function handleDropOnFolder(file: FileItem, targetFolder: FileItem) {
+    if (file.path === targetFolder.path) return;
+    try {
+      const res = await api.checkConflicts(targetFolder.path, [file.name]);
+      if (res.conflicts && res.conflicts.length > 0) {
+        setConflictState({ type: 'move', sourcePaths: [file.path], destPath: targetFolder.path, conflicts: res.conflicts });
+        return;
+      }
+      await api.move(file.path, targetFolder.path);\`
+);
+
+fs.writeFileSync('frontend/src/components/FileExplorer.tsx', content);