🐛 fix(tabs): 修复短连接标签占用固定间距

- 将连接标签由固定 flex 基准改为按内容宽度收缩
- 保留 92px 最大宽度以避免长连接名称撑开标签
- 增加短连接名称间距回归测试

frontend/src/components/TabManager.hover.test.tsx

@@ -310,6 +310,13 @@ describe('TabManager hover info', () => {
     expect(source).not.toContain('gn-v2-main-tabs-rich');
   });
 
+  it('keeps short secondary connection labels content-sized', () => {
+    const css = readFileSync(new URL('../v2-theme.css', import.meta.url), 'utf8');
+
+    expect(css).toMatch(/\.gn-v2-tab-label-part-connection \{[^}]*flex: 0 1 auto;[^}]*max-width: 92px;/s);
+    expect(css).not.toMatch(/\.gn-v2-tab-label-part-connection \{[^}]*flex: 0 1 92px;/s);
+  });
+
   it('wires hover card tab-switch and drag-blocking handlers with selectable text styles', () => {
     const source = readFileSync(new URL('./TabManager.tsx', import.meta.url), 'utf8');
 

frontend/src/v2-theme.css

@@ -3626,7 +3626,8 @@ body[data-ui-version="v2"] .gn-v2-tab-label-part-object {
 }
 
 body[data-ui-version="v2"] .gn-v2-tab-label-part-connection {
-  flex: 0 1 92px;
+  flex: 0 1 auto;
+  max-width: 92px;
   color: var(--gn-fg-2);
   font-family: var(--gn-font-mono);
   font-weight: 700;