fix: 메인 국가·장수 정보 헤더를 제거한다

국가와 장수 카드의 본문 및 접근 가능한 이름은 유지하면서 데스크톱과 모바일의 중복 외곽 헤더만 숨긴다. 실제 Chromium 회귀로 두 viewport의 헤더 부재와 레이아웃을 검증한다.

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

@@ -1136,6 +1136,7 @@ test('desktop menus preserve ref columns, prefix-safe routes, and controlled dro
     await installFixture(page, state);
     await page.setViewportSize({ width: 1200, height: 900 });
     await waitForMain(page);
+
     if (artifactRoot) await mkdir(resolve(artifactRoot), { recursive: true });
 
     await expect(page.locator('.main-global-menu')).toHaveCount(3);
@@ -1994,6 +1995,17 @@ test('main cards and command input stay inside their Ref-sized grid slots', asyn
     await page.setViewportSize({ width: 1200, height: 900 });
     await waitForMain(page);
 
+    for (const [target, label] of [
+        ['nation', '국가 정보'],
+        ['general', '장수 정보'],
+    ] as const) {
+        const panel = page.locator(`.layout-desktop [data-main-target="${target}"]`);
+        await expect(panel).toHaveAttribute('aria-label', label);
+        await expect(panel.locator(':scope > .panel-header')).toHaveCount(0);
+        await expect(panel.locator(':scope > .panel-body')).toBeVisible();
+    }
+    await expect(page.locator('.layout-desktop [data-main-target="city"] > .panel-header')).toContainText('도시 정보');
+
     const cityBars = page.locator('[data-main-target="city"] [role="progressbar"]');
     const statBars = page.locator('[data-stat-progress] [role="progressbar"]');
     const experienceBar = page.locator('[data-experience-progress] [role="progressbar"]');
@@ -2321,6 +2333,16 @@ test('main cards and command input stay inside their Ref-sized grid slots', asyn
 
     await page.setViewportSize({ width: 500, height: 900 });
     await expect(page.locator('.layout-mobile')).toBeVisible();
+    for (const [target, label] of [
+        ['nation', '국가 정보'],
+        ['general', '장수 정보'],
+    ] as const) {
+        const panel = page.locator(`.layout-mobile [data-main-target="${target}"]`);
+        await expect(panel).toHaveAttribute('aria-label', label);
+        await expect(panel.locator(':scope > .panel-header')).toHaveCount(0);
+        await expect(panel.locator(':scope > .panel-body')).toBeVisible();
+    }
+    await expect(page.locator('.layout-mobile [data-main-target="city"] > .panel-header')).toContainText('도시 정보');
     await page.locator('[data-main-target="commands"] .bottom-actions').getByRole('button', { name: '펼치기' }).click();
     expect(await page.evaluate(() => document.documentElement.scrollWidth)).toBeLessThanOrEqual(500);
     await expect(page.locator('[data-main-target="city"] [role="progressbar"]')).toHaveCount(8);

app/game-frontend/src/components/ui/PanelCard.vue

@@ -2,14 +2,18 @@
 interface Props {
     title: string;
     subtitle?: string;
+    hideHeader?: boolean;
 }
 
-defineProps<Props>();
+withDefaults(defineProps<Props>(), {
+    subtitle: undefined,
+    hideHeader: false,
+});
 </script>
 
 <template>
     <section class="panel-card">
-        <header class="panel-header">
+        <header v-if="!hideHeader" class="panel-header">
             <div>
                 <h2 class="panel-title">{{ title }}</h2>
                 <p v-if="subtitle" class="panel-subtitle">{{ subtitle }}</p>

app/game-frontend/src/views/MainView.vue

@@ -295,7 +295,7 @@ watch(
                 </div>
 
                 <div v-else-if="panelId === 'nation'" class="mobile-panel" data-mobile-panel-id="nation">
-                    <PanelCard title="국가 정보" data-main-target="nation">
+                    <PanelCard title="국가 정보" hide-header aria-label="국가 정보" data-main-target="nation">
                         <NationBasicCard :nation="nation" :loading="loading" />
                     </PanelCard>
                 </div>
@@ -306,7 +306,7 @@ watch(
                     :class="{ 'mobile-panel--flush': isFlushMobilePanel(panelId, panelIndex) }"
                     data-mobile-panel-id="general"
                 >
-                    <PanelCard title="장수 스탯" data-main-target="general">
+                    <PanelCard title="장수 스탯" hide-header aria-label="장수 정보" data-main-target="general">
                         <GeneralBasicCard :general="general" :loading="loading" :nation-color="nation?.color" />
                     </PanelCard>
                 </div>
@@ -456,10 +456,10 @@ watch(
             <PanelCard title="도시 정보" data-main-target="city">
                 <CityBasicCard :city="city" :loading="loading" />
             </PanelCard>
-            <PanelCard title="국가 정보" data-main-target="nation">
+            <PanelCard title="국가 정보" hide-header aria-label="국가 정보" data-main-target="nation">
                 <NationBasicCard :nation="nation" :loading="loading" />
             </PanelCard>
-            <PanelCard title="장수 스탯" data-main-target="general">
+            <PanelCard title="장수 스탯" hide-header aria-label="장수 정보" data-main-target="general">
                 <GeneralBasicCard :general="general" :loading="loading" :nation-color="nation?.color" />
             </PanelCard>
             <MainNationMenu