### Problem
The "Validate workflow links" test fails because workflow validation is
disabled by default, preventing toast notifications from appearing.
### Solution
Enable the `Comfy.Validation.Workflows` setting before loading the
bad_link workflow in the test.
### Changes
Modified `browser_tests/tests/graph.spec.ts` to enable workflow
validation setting before test execution
### Root Cause
The `Comfy.Validation.Workflows` setting defaults to `false` (per
`src/stores/settingStore.ts`). Without this setting enabled, the
validation code path in `src/scripts/app.ts#L1085` is skipped, so no
toast notifications are generated.
## Testing
- Test now passes locally and should pass in CI
- Verified setting enables validation flow that generates expected 2
toasts:
1. "Workflow Validation" with validation logs
2. "Workflow Links Fixed" confirming successful fixes
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7833-fix-enable-workflow-validation-2dc6d73d36508152b863f2e64ae57ecb)
by [Unito](https://www.unito.io)
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