feat: complete Tasks 21-28 — backend integration, security hardening, UI tests & CI

- Add Apple Sign-In backend (JWKS verification, account linking, session management)
- Implement push notification deep linking with NotificationDeepLinkRouter
- Add jailbreak detection, runtime integrity monitoring, secure enclave service
- Implement OAuth social login, token refresh, and secure logout flows
- Add image caching (memory/disk), optimizer, upload queue, async semaphore
- Implement notification analytics, type preferences, and category setup
- Expand UI test suite with UITestBase, accessibility, auth flow, performance tests
- Add CI pipeline for iOS UI tests (3 device sizes) and performance benchmarks
- Restructure Xcode project to manual groups with KordantWidgets target
- Add SwiftLint, Swift Collections/Algorithms/GoogleSignIn dependencies
- Update project.yml for XcodeGen with new targets and configurations

.github/workflows/ci.yml

@@ -114,6 +114,150 @@ jobs:
             exit 1
           fi
 
+  ios-ui-tests:
+    name: iOS UI Tests
+    runs-on: macos-14
+    needs: [lint-typecheck]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Select Xcode
+        run: |
+          sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+          xcodebuild -version
+          xcrun simctl list devices
+
+      - name: Install xcpretty
+        run: gem install xcpretty --no-document || true
+
+      - name: Build for UI Testing
+        run: |
+          cd iOS
+          xcodebuild build-for-testing \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -sdk iphonesimulator \
+            -destination 'platform=iOS Simulator,name=iPhone 15 Pro Max,OS=latest' \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Run UI Tests on iPhone 15 Pro Max
+        run: |
+          cd iOS
+          xcodebuild test-without-building \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -destination 'platform=iOS Simulator,name=iPhone 15 Pro Max,OS=latest' \
+            -resultBundlePath TestResults/iPhone15ProMax.xcresult \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Run UI Tests on iPhone 14
+        run: |
+          cd iOS
+          xcodebuild test-without-building \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -destination 'platform=iOS Simulator,name=iPhone 14,OS=latest' \
+            -resultBundlePath TestResults/iPhone14.xcresult \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Run UI Tests on iPhone SE (3rd gen)
+        run: |
+          cd iOS
+          xcodebuild test-without-building \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -destination 'platform=iOS Simulator,name=iPhone SE (3rd generation),OS=latest' \
+            -resultBundlePath TestResults/iPhoneSE.xcresult \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Upload Test Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ios-ui-test-results
+          path: iOS/TestResults/
+          retention-days: 14
+
+      - name: Upload Screenshots on Failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ios-ui-test-screenshots
+          path: |
+            ~/Library/Developer/Xcode/DerivedData/**/Logs/Test/*.png
+            iOS/TestResults/**/*.xcresult
+          retention-days: 7
+
+  ios-performance-tests:
+    name: iOS Performance Tests
+    runs-on: macos-14
+    needs: [lint-typecheck]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Select Xcode
+        run: |
+          sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+          xcodebuild -version
+
+      - name: Install xcpretty
+        run: gem install xcpretty --no-document || true
+
+      - name: Build for Performance Testing
+        run: |
+          cd iOS
+          xcodebuild build-for-testing \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -testPlan PerformanceTests \
+            -sdk iphonesimulator \
+            -destination 'platform=iOS Simulator,name=iPhone 15 Pro,OS=latest' \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Run Unit Performance Tests
+        run: |
+          cd iOS
+          xcodebuild test-without-building \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -testPlan PerformanceTests \
+            -destination 'platform=iOS Simulator,name=iPhone 15 Pro,OS=latest' \
+            -only-testing:KordantTests/XCTMetricPerformanceTests \
+            -resultBundlePath TestResults/UnitPerformance.xcresult \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Run UI Performance Tests (simulator — indicative only)
+        run: |
+          cd iOS
+          xcodebuild test-without-building \
+            -project Kordant.xcodeproj \
+            -scheme Kordant \
+            -testPlan PerformanceTests \
+            -destination 'platform=iOS Simulator,name=iPhone 15 Pro,OS=latest' \
+            -only-testing:KordantUITests/LaunchPerformanceTests \
+            -only-testing:KordantUITests/ScrollPerformanceTests \
+            -only-testing:KordantUITests/NavigationPerformanceTests \
+            -only-testing:KordantUITests/MemoryPerformanceTests \
+            -only-testing:KordantUITests/DataLoadingPerformanceTests \
+            -resultBundlePath TestResults/UIPerformance.xcresult \
+            CODE_SIGNING_ALLOWED=NO 2>&1 | xcpretty -c && exit ${PIPESTATUS[0]}
+
+      - name: Upload Performance Test Results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ios-performance-test-results
+          path: iOS/TestResults/
+          retention-days: 30
+
+      - name: Post Performance Report
+        if: always()
+        run: |
+          echo "## iOS Performance Test Results" >> $GITHUB_STEP_SUMMARY
+          echo "" >> $GITHUB_STEP_SUMMARY
+          echo "⚠️ **Note:** UI performance tests run on simulators for regression detection only." >> $GITHUB_STEP_SUMMARY
+          echo "Final performance baselines must be validated on physical devices." >> $GITHUB_STEP_SUMMARY
+
   docker:
     name: Docker Build
     runs-on: ubuntu-latest