Add diagram legend showing node type color meanings #59
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Problem
The reference design (
examples/route-diagram-example.html) includes a legend that explains the color coding of different node types (Endpoint, EIP, Processor, Error, Cross-route). The current implementation is missing this legend entirely.Expected
A legend panel (bottom or corner of the diagram area) showing:
Should be unobtrusive but visible, matching the reference design style.
Reference
examples/route-diagram-example.html— legend section.