feat: add create and delete file/folder functionality to editor

- Add Tauri backend commands: create_file, create_directory, delete_file, delete_directory
- Add editor store functions for create/delete with auto-refresh
- Add FileContextMenu component with right-click support
- Add InputDialog component for file/folder name input
- Add ConfirmDialog component for delete confirmation
- Add Ctrl+N keyboard shortcut for new file
- Update keyboard shortcuts modal with new shortcuts
- Auto-close tabs when their files are deleted
- Auto-refresh file tree after create/delete operations

src-tauri/src/lib.rs

@@ -154,6 +154,10 @@ pub fn run() {
             list_directory,
             read_file_content,
             write_file_content,
+            create_file,
+            create_directory,
+            delete_file,
+            delete_directory,
         ])
         .run(tauri::generate_context!())
         .expect("error while running tauri application");