Visual Mode: read-only graph view of workflows

**What the feature is (as Title)**

Visual Mode: read-only graph view of workflows

**Value proposition**

Instead of reading a wall of YAML to understand what an automation does, users can now see it. Visual Mode renders any workflow as a graph showing the triggers, steps, branches, and logic at a glance, alongside the existing YAML view. As AI generates more workflows, comprehension becomes the bottleneck; Visual Mode is how authors verify a generated or inherited workflow does what they intend, and how teammates understand workflows they did not write.

**Expected outcome**

- A read-only graph rendering of any workflow, available alongside the YAML editor
- Easier review, onboarding, and debugging of workflow logic
- The foundation for visual workflow building in future releases

**Optional: Key user stories / use cases**

- Reviewing an AI-generated workflow before enabling it
- Onboarding a teammate onto an existing automation without walking them through the YAML