feat(games): add coming badge for unreleased games

src/pages/GameDetail.test.jsx

@@ -38,6 +38,23 @@ afterEach(() => {
 });
 
 describe('GameDetail', () => {
+    it('shows the coming badge of a game that is not released yet', async () => {
+        answer({...game, source: 'STEAM', coming: true, comingOn: '2026-12-04'});
+        renderDetail();
+
+        expect(await screen.findByText('LIBRARY.COMING')).toBeTruthy();
+    });
+
+    it('shows no coming badge for a released game', async () => {
+        answer({...game, source: 'STEAM', coming: false, comingOn: null});
+        renderDetail();
+
+        await screen.findByText('Half-Life 2');
+
+        expect(screen.queryByText('LIBRARY.COMING')).toBeNull();
+        expect(screen.queryByText('LIBRARY.COMING_SOON')).toBeNull();
+    });
+
     it('asks "finished?" instead of "playing?" when Core has a finished hint', async () => {
         answer({...game, playtime2Weeks: 90, source: 'STEAM', finishedHint: {type: 'ENDING', achievement: 'Survivor'}});
         renderDetail();