feat(library): ask whether a game is finished

src/pages/GameDetail.test.jsx

@@ -38,6 +38,15 @@ afterEach(() => {
 });
 
 describe('GameDetail', () => {
+    it('asks "finished?" instead of "playing?" when Core has a finished hint', async () => {
+        globalThis.fetch = vi.fn(async () => ({ok: true, status: 200, json: async () => ({...game, playtime2Weeks: 90,
+            source: 'STEAM', finishedHint: {type: 'ENDING', achievement: 'Survivor'}})}));
+        renderDetail();
+
+        expect(await screen.findByRole('button', {name: 'GAME_DETAIL.SET_FINISHED'})).toBeTruthy();
+        expect(screen.queryByRole('button', {name: 'GAME_DETAIL.SET_PLAYING'})).toBeNull();
+    });
+
     it('hides a Steam game and shows it again', async () => {
         globalThis.fetch = vi.fn(async (url, init) => init?.method === 'PUT'
             ? {ok: true, status: 200, json: async () => JSON.parse(init.body)}