UI: Hide edges when filtering nodes in graph view

# Summary

When filtering nodes, hide the graph edges as well as the nodes, or at least provide an option to toggle this behavior.

# Use Cases

Suppose I have 100 parallel nodes and I want to find the 1 node that failed, I will filter to only the failed nodes. Then I still have to scroll back and forth to find the actual node. Once I have filtered, that should simply be the only remaining node in that layer. This kind of "empty tree" view is not very helpful. (I promise, there is a failed node off to the left somewhere 😄)


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**Message from the maintainers**:

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Start by locating the graph-view node filtering and edge-rendering entry points in the repository, then reproduce the behavior described in the issue with a filtered graph. Done means filtered views hide unrelated edges or expose a toggle, while preserving the intended node layout; add or update the relevant UI test if the existing test structure supports it.

Written by the indexing model from the issue text.