The antd mocks in RouterSettingsForm.test.tsx and index.test.tsx
replaced the entire antd module with only Select, so the Switch and
Button used by nested components failed to render. Use importOriginal
to preserve the rest of antd and override only Select.
Also fix the TagFilteringToggle click assertion — antd's Switch fires
onChange with (checked, event), so toHaveBeenCalledWith(true) was
always going to miss. Assert the checked arg directly instead of
coupling to antd's call signature.
260679679f