feat(ci): add Codecov integration with frontend Jest coverage and CODECOV_TOKEN

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/53f8deb9-5c3a-4940-a058-c8ee7e4104e0

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

.github/workflows/ci.yml

@@ -123,12 +123,37 @@ jobs:
           cd backend
           pytest tests/ -v --cov=app --cov-report=xml --cov-report=term
 
-      - name: Upload coverage to Codecov
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: '20.19.0'
+          cache: 'npm'
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install frontend dependencies
+        run: npm ci
+        working-directory: frontend
+
+      - name: Run frontend tests with coverage
+        run: npm run test:ci
+        working-directory: frontend
+
+      - name: Upload backend coverage to Codecov
         uses: codecov/codecov-action@v5
         with:
+          token: ${{ secrets.CODECOV_TOKEN }}
           files: ./backend/coverage.xml
-          flags: unittests
-          name: codecov-umbrella
+          flags: backend
+          name: backend-coverage
+          fail_ci_if_error: false
+
+      - name: Upload frontend coverage to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./frontend/coverage/lcov.info
+          flags: frontend
+          name: frontend-coverage
           fail_ci_if_error: false
 
   # ── Phase 3: Security ──────────────────────────────────────────────────