Read-only JSON tree with collapse controls, virtualization, and low-node CSS-based indentation guides.
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Primary viewer using the current source text, including the built-in copy menu and one custom item.
Stress case with a large array to exercise flattening and virtualization.
Verifies support for `Map`, `Set`, and cyclic references that are not representable in JSON text.
Exercises nested `ref`, `computed`, `reactive`, and reactive `Map`/`Set` values.