'..' parent row in the file list

Synthetic cursor-navigable first row (hidden at /) — Enter/double-click goes to
the parent like the toolbar button. Excluded from selection, rename, delete,
chmod, and transfers; shown with an up-arrow icon.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ui/src/app/transfers.service.ts

@@ -47,7 +47,7 @@ export class TransfersService {
     const selected = src.selectedEntries();
     const atCursor = src.sorted()[src.cursor()];
     const targets = (selected.length ? selected : atCursor ? [atCursor] : []).filter(
-      (e) => e.type !== 'symlink',
+      (e) => e.type !== 'symlink' && e.name !== '..',
     );
     if (!targets.length) {
       this.toast.info('Nothing to copy (symlinks are skipped)');