ci: 注解只保留失败条目，避免被通过用例挤掉

.github/workflows/build.yml

@@ -49,8 +49,10 @@ jobs:
         shell: bash
         run: |
           npm test > /tmp/unit.log 2>&1 || {
-            echo "::error title=单元测试失败::$(tail -120 /tmp/unit.log \
-              | sed 's/%/%25/g; s/\r//g' | awk '{printf "%s%%0A", $0}')"
+            # 注解有长度上限，只挑失败条目与错误细节，别把通过的用例也塞进去
+            grep -E '^(✖|not ok)' /tmp/unit.log | head -20
+            echo "::error title=单元测试失败::$(grep -E '^(✖|not ok)|AssertionError|actual:|expected:|operator:|^\s+at ' /tmp/unit.log \
+              | head -40 | cut -c1-300 | sed 's/%/%25/g; s/\r//g' | awk '{printf "%s%%0A", $0}')"
             exit 1
           }
           tail -6 /tmp/unit.log