为 pwsh 测试加显式超时，修复 CI 偶发超时

CI 的 ubuntu runner 预装 pwsh，Windows uninstall/update/installer-output
等测试会真实执行。这些测试每次都要冷启动 pwsh 进程，首次调用可超过
bun test 默认的 5 秒单测超时（CI 实测 5151ms 失败）。

为 5 个 pwsh 测试点加 30 秒显式超时；两处原本没有超时的 spawnSync
补 10 秒上限，避免 runner 卡顿时测试无限挂起。

frontend/src/install.test.ts

@@ -131,7 +131,7 @@ describe("Windows uninstall ownership", () => {
       } finally {
         rmSync(directory, { recursive: true, force: true });
       }
-    });
+    }, 30_000);
   }
 });
 

frontend/src/installerOutput.test.ts

@@ -97,9 +97,9 @@ for (const [name, path, server] of [
         $errors = $null
         [System.Management.Automation.Language.Parser]::ParseFile($env:TEST_SCRIPT, [ref]$tokens, [ref]$errors) > $null
         if ($errors.Count) { $errors | ForEach-Object { Write-Error $_ }; exit 1 }
-      `], { env: { ...process.env, TEST_SCRIPT: file }, encoding: "utf8" });
+      `], { env: { ...process.env, TEST_SCRIPT: file }, encoding: "utf8", timeout: 10_000 });
       expect(result.status).toBe(0);
-    });
+    }, 30_000);
 
     test.skipIf(!powershell)("separates fresh-install guidance from update results", () => {
       const states = server ? [[true, false, false], [false, false, false]] : [
@@ -120,7 +120,7 @@ for (const [name, path, server] of [
           $Port = 3100
           Write-Step "正在启动服务"
           Show-InstallResult
-        `], { encoding: "utf8" });
+        `], { encoding: "utf8", timeout: 10_000 });
         expect(result.status).toBe(0);
         const output = result.stdout.replaceAll("\r\n", "\n");
         if (fresh) {
@@ -130,6 +130,6 @@ for (const [name, path, server] of [
           expect(output).toBe("正在启动服务\n\n更新完成（v1.2.3）\n");
         }
       }
-    });
+    }, 30_000);
   });
 }

frontend/src/updateSafety.test.ts

@@ -239,7 +239,7 @@ describe("Windows update process lifecycle", () => {
         `], { env: { ...process.env, TEST_MODE: mode }, encoding: "utf8", timeout: 10_000 });
         expect(result.status).toBe(mode === "stops" ? 0 : 1);
         expect(result.stdout.trim()).toBe(mode === "stops" ? "replaced:2" : "blocked");
-      });
+      }, 30_000);
     }
   }
 
@@ -271,5 +271,5 @@ describe("Windows update process lifecycle", () => {
     } finally {
       rmSync(directory, { recursive: true, force: true });
     }
-  });
+  }, 30_000);
 });