Fix screen reader config bug (#7615)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Bryan Morgan <bryanmorgan@google.com>

packages/cli/src/config/settingsSchema.ts

@@ -300,7 +300,7 @@ export const SETTINGS_SCHEMA = {
             label: 'Screen Reader Mode',
             category: 'UI',
             requiresRestart: true,
-            default: false,
+            default: undefined as boolean | undefined,
             description:
               'Render output in plain-text to be more screen reader accessible',
             showInDialog: true,