Fix CI E2E: check Planner DB, add Playwright HTML report

- Integration test DB check now hits Planner API (not Journal)
  so it correctly skips when no PostgreSQL in CI
- Playwright uploads HTML report artifact on all runs (not just failures)
- Install Chromium with --with-deps for CI compatibility
- Report retained for 30 days

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -75,13 +75,11 @@ jobs:
           node-version: 24
           cache: pnpm
       - run: pnpm install --frozen-lockfile
-      - run: pnpm exec playwright install chromium
+      - run: pnpm exec playwright install --with-deps chromium
       - run: pnpm test:e2e
       - uses: actions/upload-artifact@v7
-        if: failure()
+        if: ${{ !cancelled() }}
         with:
           name: playwright-report
-          path: |
-            e2e/results/
-            playwright-report/
-          retention-days: 7
+          path: playwright-report/
+          retention-days: 30