feat(ui): add solid background color option for input prompt (#16563)

Co-authored-by: Alexander Farber <farber72@outlook.de>

packages/cli/src/ui/components/SettingsDialog.test.tsx

@@ -43,7 +43,7 @@ const mockSetVimMode = vi.fn();
 
 vi.mock('../contexts/UIStateContext.js', () => ({
   useUIState: () => ({
-    mainAreaWidth: 100, // Fixed width for consistent snapshots
+    terminalWidth: 100, // Fixed width for consistent snapshots
   }),
 }));