fix(ci): remove hardcoded timeout, use GitHub Actions default

- Remove timeout-minutes: 40 from E2E test step
- Let GitHub Actions use default 360 minute timeout
- Actual test duration controlled by calibration-based step timeouts
- Calibration dynamically adjusts timeouts based on CI performance

.github/workflows/test.yml

@@ -68,6 +68,8 @@ jobs:
       
       - name: Run E2E tests
         # E2E GUI tests with Electron on Linux require a virtual framebuffer, upgrade screen size from time to time.
+        # No timeout specified - uses GitHub Actions default (360 minutes)
+        # Actual test duration is controlled by calibration-based step timeouts in cucumber
         run: xvfb-run --auto-servernum --server-args="-screen 0 2560x1440x24" pnpm run test:e2e
         env:
           CI: true
@@ -75,10 +77,6 @@ jobs:
           # Set Chinese locale for i18n testing
           LANG: zh_CN.UTF-8
           LC_ALL: zh_CN.UTF-8
-        # Dynamic timeout based on calibration result. If calibration succeeds, timeout is calculated.
-        # If calibration fails, fallback multiplier (4.0×) is used: 25s × 4.0 × 65 scenarios / 60 ≈ 108min
-        # Conservative 40min allows room for both calibrated and fallback scenarios
-        timeout-minutes: 40
 
       # Upload test artifacts (screenshots, logs)
       - name: Upload test artifacts