feat(planner): add isLoading prop to SwapSuggestionList — disables Pick buttons during PATCH

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/planner/SwapSuggestionList.test.ts

@@ -74,6 +74,18 @@ describe('SwapSuggestionList', () => {
 		expect(screen.getByTestId('swap-empty-state')).toBeTruthy();
 	});
 
+	it('disables all Wählen buttons when isLoading is true', () => {
+		render(SwapSuggestionList, { props: { ...baseProps, isLoading: true } });
+		const buttons = screen.getAllByRole('button', { name: /Wählen/i });
+		buttons.forEach((btn) => expect((btn as HTMLButtonElement).disabled).toBe(true));
+	});
+
+	it('Wählen buttons are enabled when isLoading is false', () => {
+		render(SwapSuggestionList, { props: { ...baseProps, isLoading: false } });
+		const buttons = screen.getAllByRole('button', { name: /Wählen/i });
+		buttons.forEach((btn) => expect((btn as HTMLButtonElement).disabled).toBe(false));
+	});
+
 	it('renders optional Abbrechen button when oncancel provided', () => {
 		render(SwapSuggestionList, { props: { ...baseProps, oncancel: vi.fn() } });
 		expect(screen.getByRole('button', { name: /Abbrechen/i })).toBeTruthy();