fix: 인게임 내용 폰트를 Pretendard로 통일

게임 프론트 전역에서 Pretendard를 한 번 로드하고 본문·기록·표·입력·버튼의 명시적 글꼴을 공통 토큰으로 통일한다. production Chromium 검증과 정적 회귀 검사를 함께 추가한다.

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

@@ -0,0 +1,59 @@
+import assert from 'node:assert/strict';
+import { readFile, readdir } from 'node:fs/promises';
+import path from 'node:path';
+import { describe, it } from 'node:test';
+
+const sourceRoot = path.resolve(import.meta.dirname, '../src');
+const fontFamilyDeclaration = /font-family\s*:\s*([^;]+);/g;
+const fontShorthandDeclaration = /(?:^|[\s{])font\s*:\s*([^;]+);/gm;
+
+const listStyleSources = async (): Promise<string[]> => {
+    const entries = await readdir(sourceRoot, { recursive: true, withFileTypes: true });
+
+    return entries
+        .filter((entry) => entry.isFile() && (entry.name.endsWith('.css') || entry.name.endsWith('.vue')))
+        .map((entry) => path.join(entry.parentPath, entry.name))
+        .sort();
+};
+
+void describe('game content font contract', () => {
+    void it('loads Pretendard once from the global stylesheet entry', async () => {
+        const importPattern =
+            /@import url\(['"]https:\/\/cdn\.jsdelivr\.net\/gh\/orioncactus\/pretendard\/dist\/web\/static\/pretendard\.css['"]\);/g;
+        const imports: string[] = [];
+
+        for (const file of await listStyleSources()) {
+            const source = await readFile(file, 'utf8');
+            if (importPattern.test(source)) {
+                imports.push(path.relative(sourceRoot, file));
+            }
+            importPattern.lastIndex = 0;
+        }
+
+        assert.deepEqual(imports, ['assets/main.css']);
+    });
+
+    void it('uses the shared sans token for every explicit content font declaration', async () => {
+        const violations: string[] = [];
+
+        for (const file of await listStyleSources()) {
+            const source = await readFile(file, 'utf8');
+
+            for (const match of source.matchAll(fontFamilyDeclaration)) {
+                const value = match[1]?.trim();
+                if (value !== 'inherit' && value !== 'var(--sammo-font-sans)') {
+                    violations.push(`${path.relative(sourceRoot, file)}: font-family: ${value}`);
+                }
+            }
+
+            for (const match of source.matchAll(fontShorthandDeclaration)) {
+                const value = match[1]?.trim();
+                if (value !== 'inherit' && !value?.includes('var(--sammo-font-sans)')) {
+                    violations.push(`${path.relative(sourceRoot, file)}: font: ${value}`);
+                }
+            }
+        }
+
+        assert.deepEqual(violations, []);
+    });
+});