fix(game-frontend): 토너먼트 새 창 닫기를 복원한다

토너먼트와 베팅장 공통 헤더의 창 닫기가 메인 라우트로 이동하지 않고 Ref처럼 현재 보조 창을 닫도록 변경한다. noopener 새 창에서 두 경로를 닫고 원래 창이 유지되는 Chromium 회귀 테스트를 추가한다.

app/game-frontend/e2e/tournamentBracket.spec.ts

@@ -693,6 +693,30 @@ test('tournament and betting pages expose same-row navigation tabs beside close'
     expect(await page.evaluate(() => document.documentElement.scrollWidth)).toBeLessThanOrEqual(390);
 });
 
+test('tournament and betting close only their script-opened popup window', async ({ page }, testInfo) => {
+    const baseURL = testInfo.project.use.baseURL;
+    expect(typeof baseURL).toBe('string');
+    await page.goto('about:blank');
+
+    for (const route of ['tournament', 'betting'] as const) {
+        const popupPromise = page.waitForEvent('popup');
+        await page.evaluate(() => window.open('about:blank', '_blank', 'noopener'));
+        const popup = await popupPromise;
+        await installFixture(popup, { tournamentStage: route === 'betting' ? 6 : 1 });
+        await popup.goto(new URL(route, baseURL as string).href);
+
+        await expect(popup.getByRole('button', { name: '창 닫기' }).first()).toBeVisible();
+        expect(await popup.evaluate(() => window.opener)).toBeNull();
+
+        const closed = popup.waitForEvent('close');
+        await popup.getByRole('button', { name: '창 닫기' }).first().click();
+        await closed;
+
+        expect(page.isClosed()).toBe(false);
+        expect(page.url()).toBe('about:blank');
+    }
+});
+
 test('mobile betting rankings use tabs and keep dedicated icons beside general names', async ({ page }, testInfo) => {
     await page.setViewportSize({ width: 390, height: 844 });
     const { placedBets } = await installFixture(page, { tournamentStage: 6 });

app/game-frontend/src/components/tournament/TournamentPageHeader.vue

@@ -3,6 +3,8 @@ defineProps<{
     activePage: 'tournament' | 'betting';
     title: string;
 }>();
+
+const closeWindow = (): void => window.close();
 </script>
 
 <template>
@@ -35,15 +37,13 @@ defineProps<{
                     </button>
                 </RouterLink>
             </nav>
-            <RouterLink v-slot="{ navigate }" custom to="/">
-                <button
-                    class="legacy-button legacy-button--navigation legacy-button--fixed-height close-button"
-                    type="button"
-                    @click="navigate"
-                >
-                    창 닫기
-                </button>
-            </RouterLink>
+            <button
+                class="legacy-button legacy-button--navigation legacy-button--fixed-height close-button"
+                type="button"
+                @click="closeWindow"
+            >
+                창 닫기
+            </button>
         </div>
     </header>
 </template>

app/game-frontend/test/legacyButtonFamily.test.ts

@@ -39,6 +39,8 @@ void describe('shared Lumen button family', () => {
         for (const label of ['토너먼트', '베팅장', '창 닫기']) {
             assert.match(tournamentHeader, new RegExp(`legacy-button[\\s\\S]{0,260}${label}`, 'u'));
         }
+        assert.match(tournamentHeader, /const closeWindow = \(\): void => window\.close\(\)/u);
+        assert.doesNotMatch(tournamentHeader, /custom to="\/"/u);
         assert.match(reservedEditor, /legacy-button legacy-button--info legacy-button--fixed-height select-command/u);
         assert.match(reservedEditor, /명령 선택 ▾/u);
     });