feat(library): add platform badges, remove hide duplicates

Gitea #34 slice 2 of 3. Core lists each set once now.
The hide duplicates toggle and its param are not needed.
PlatformIcons shows a badge per platform (platforms[]).

src/components/PlatformIcons.test.jsx

@@ -0,0 +1,44 @@
+// @vitest-environment jsdom
+import {afterEach, describe, expect, it, vi} from 'vitest';
+import {cleanup, render, screen} from '@testing-library/react';
+import PlatformIcons from './PlatformIcons.jsx';
+
+vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
+
+afterEach(cleanup);
+
+describe('PlatformIcons', () => {
+    it('showsOneBadgeWithALabelPerPlatform', () => {
+        render(<PlatformIcons platforms={[{source: 'STEAM', platform: null}, {source: 'PSN', platform: 'PS5'}]}/>);
+
+        expect(screen.getAllByRole('listitem')).toHaveLength(2);
+        expect(screen.getByLabelText('Steam').textContent).toBe('ST');
+        expect(screen.getByLabelText('PS5').textContent).toBe('PS5');
+    });
+
+    it('namesAPlayStationTitleWithoutPlatformAfterItsSource', () => {
+        render(<PlatformIcons platforms={[{source: 'PSN', platform: null}]}/>);
+
+        expect(screen.getByLabelText('LIBRARY.SOURCE.PSN').textContent).toBe('PS');
+    });
+
+    it('showsAManualPlatformByName', () => {
+        render(<PlatformIcons platforms={[{source: 'MANUAL', platform: 'Switch'}]}/>);
+
+        expect(screen.getByLabelText('Switch').textContent).toBe('Switch');
+    });
+
+    it('aManualGameWithoutPlatformIsNotShownAsPlayStation', () => {
+        render(<PlatformIcons platforms={[{source: 'MANUAL', platform: null}]}/>);
+
+        expect(screen.getByLabelText('LIBRARY.SOURCE.MANUAL').textContent).not.toBe('PS');
+    });
+
+    it('rendersNothingWithoutPlatforms', () => {
+        const {container} = render(<PlatformIcons platforms={[]}/>);
+        expect(container.firstChild).toBeNull();
+        cleanup();
+        const missing = render(<PlatformIcons/>);
+        expect(missing.container.firstChild).toBeNull();
+    });
+});