fix: Add timeout and cleanup for hanging emulator processes

- Add 30-minute timeout to instrumented tests to prevent indefinite hanging
- Add forced cleanup of emulator/qemu processes after test completion
- Add coverage file existence check before Codecov upload
- Make coverage upload conditional on file existence
- Use 'if: always()' for cleanup to ensure it runs even on timeout/failure

Fixes issue where API level 29 emulator hangs during termination process,
causing CI jobs to run indefinitely. The tests complete successfully but
emulator shutdown gets stuck with 'stop: Not implemented' errors.

Author: cango91

.github/workflows/ci.yml

@@ -146,6 +146,7 @@ jobs:
           adb shell input keyevent 82
 
     - name: Run instrumented tests
+      timeout-minutes: 30
       uses: reactivecircus/android-emulator-runner@v2
       with:
         api-level: ${{ matrix.api-level }}
@@ -156,7 +157,25 @@ jobs:
         disable-animations: true
         script: ./gradlew connectedAndroidTest
 
+    - name: Force cleanup emulator processes
+      if: always()
+      run: |
+        pkill -f emulator || true
+        pkill -f qemu || true
+        
+    - name: Check coverage report exists
+      id: coverage-check
+      run: |
+        if [ -f "./app/build/reports/coverage/androidTest/debug/connected/report.xml" ]; then
+          echo "coverage_exists=true" >> $GITHUB_OUTPUT
+          echo "Coverage report found"
+        else
+          echo "coverage_exists=false" >> $GITHUB_OUTPUT
+          echo "Coverage report not found"
+        fi
+
     - name: Upload coverage to Codecov
+      if: steps.coverage-check.outputs.coverage_exists == 'true'
       uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}