fix(e2e): let web-e2e:e2e run outside CI (#1779)

.github/workflows/ci.yml

@@ -375,6 +375,12 @@ jobs:
             - name: Validate stylesheet Nx inputs
               run: pnpm run styles:inputs:validate
 
+            # Nx rejects a non-parallel task with continuous dependencies, and
+            # the Playwright plugin infers serve dependencies only when CI is
+            # unset, so this checks both the local and the CI inference.
+            - name: Validate Playwright task graphs
+              run: pnpm run e2e:task-graphs:validate
+
             - name: Typecheck web and Electron entry points
               run: pnpm run typecheck:ci