fix(file-explorer): add barrel export and remove unused siblingNames prop

- Add src/components/file-explorer/index.ts barrel export for
  DeleteConfirmDialog and NewItemDialog with their prop types
- Remove unused siblingNames optional prop from VirtualItemProps
  in types.ts (was never passed or consumed)

Author: echobt

src/components/explorer/types.ts

@@ -84,7 +84,6 @@ export interface VirtualItemProps {
   indentGuidesEnabled: boolean;
   enablePreview: boolean;
   isEntering: boolean;
-  siblingNames?: string[];
   onSelect: (path: string, event?: MouseEvent) => void;
   onOpen: (entry: FileEntry) => void;
   onOpenPreview: (entry: FileEntry) => void;

src/components/file-explorer/index.ts

@@ -0,0 +1,4 @@
+export { DeleteConfirmDialog } from "./DeleteConfirmDialog";
+export type { DeleteConfirmDialogProps } from "./DeleteConfirmDialog";
+export { NewItemDialog } from "./NewItemDialog";
+export type { NewItemDialogProps } from "./NewItemDialog";