合并 master 到 AI 游戏创作分支

同步共享主题样式与对应测试
同步项目约束与决策记录

src/index.test.ts

@@ -7,6 +7,13 @@ function readIndexCss() {
   return fs.readFileSync(path.resolve(process.cwd(), 'src/index.css'), 'utf8');
 }
 
+function readPlatformThemeCss() {
+  return fs.readFileSync(
+    path.resolve(process.cwd(), 'packages/shared/src/theme.css'),
+    'utf8',
+  );
+}
+
 function getCssBlock(source: string, selector: string) {
   const selectorIndex = source.indexOf(selector);
   expect(selectorIndex, `${selector} should exist in src/index.css`).toBeGreaterThanOrEqual(0);
@@ -194,11 +201,16 @@ describe('index stylesheet unread dots', () => {
 
   it('uses warm brown tokens for draft unread markers instead of red literals', () => {
     const css = readIndexCss();
+    const themeCss = readPlatformThemeCss();
 
-    expect(css).toContain('--platform-unread-dot-fill: #8b5a3d;');
-    expect(css).toContain('--platform-unread-dot-glow: rgba(139, 90, 61, 0.34);');
-    expect(css).toContain('--platform-unread-dot-fill: #d6a27c;');
-    expect(css).toContain('--platform-unread-dot-glow: rgba(214, 162, 124, 0.24);');
+    expect(themeCss).toContain('--platform-unread-dot-fill: #8b5a3d;');
+    expect(themeCss).toContain(
+      '--platform-unread-dot-glow: rgba(139, 90, 61, 0.34);',
+    );
+    expect(themeCss).toContain('--platform-unread-dot-fill: #d6a27c;');
+    expect(themeCss).toContain(
+      '--platform-unread-dot-glow: rgba(214, 162, 124, 0.24);',
+    );
 
     for (const selector of [
       '.creation-work-card__unread-dot',
@@ -213,6 +225,20 @@ describe('index stylesheet unread dots', () => {
     }
   });
 
+  it('keeps platform font overrides after branded title typography', () => {
+    const css = readIndexCss();
+    const themeCss = readPlatformThemeCss();
+    const titleRuleIndex = css.indexOf('.selection-hero-brand__title');
+    const platformThemeRuleIndex = css.indexOf('.platform-theme,\n.platform-theme *');
+
+    expect(titleRuleIndex).toBeGreaterThanOrEqual(0);
+    expect(platformThemeRuleIndex).toBeGreaterThan(titleRuleIndex);
+    expect(getCssBlock(css, '.platform-theme,\n.platform-theme *')).toContain(
+      'font-family: var(--platform-font-family) !important;',
+    );
+    expect(themeCss).not.toContain('.platform-theme,\n.platform-theme *');
+  });
+
   it('keeps the creation shelf share button on a visible surface', () => {
     const css = readIndexCss();
     const block = getCssBlock(css, '.creation-work-card__quick-action-button');