Revert "feat: add Open File Manager to tab right-click menu (#1046)" (#1050)

This reverts commit 0712fdd731.

src/ui/AppShell.tsx

@@ -1713,10 +1713,6 @@ export function AppShell({
               onAddToSplit={addTabToSplit}
               onRemoveFromSplit={removeTabFromSplit}
               onRenameTab={renameTab}
-              onOpenFileManager={(tabId) => {
-                const targetTab = tabs.find((t) => t.id === tabId);
-                if (targetTab?.host) openTab(targetTab.host, "files");
-              }}
               isAppFullscreen={isAppFullscreen}
               onToggleAppFullscreen={toggleAppFullscreen}
             />