Add comprehensive file information display to file manager

Backend improvements:
- Enhanced ls -la parsing to extract complete file metadata (size, permissions, owner, group, modified date)
- Added support for symbolic link target detection
- Changed API response format to include both files array and current path
- Improved file path construction logic

Frontend improvements:
- Updated global FileItem interface with all file metadata fields
- Removed duplicate local FileItem definitions across components
- Added formatFileSize utility with proper 0-byte handling ("0 B" instead of "-")
- Fixed 0-byte file display logic (changed from falsy check to explicit null/undefined check)
- Implemented file size display in both grid and list views
- Added smart filename collision handling with auto-incrementing suffixes
- Enhanced create-then-edit workflow to preserve items even when canceled
- Improved inline editing input styling to match shadcn design system
- Optimized input field dimensions (width constraints: 60-120px grid, max 200px list)

File creation improvements:
- Removed spaces from default names to avoid path issues (NewFile.txt, NewFolder)
- Added intelligent unique name generation (NewFile.txt → NewFile1.txt → NewFile2.txt)
- Changed cancel behavior to create items with default names instead of discarding
- Fixed SSH connection reliability with auto-reconnection for all operations

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/types/index.ts

@@ -182,8 +182,14 @@ export interface FileItem {
   name: string;
   path: string;
   isPinned?: boolean;
-  type: "file" | "directory";
+  type: "file" | "directory" | "link";
   sshSessionId?: string;
+  size?: number;
+  modified?: string;
+  permissions?: string;
+  owner?: string;
+  group?: string;
+  linkTarget?: string;
 }
 
 export interface ShortcutItem {