RayRAG v0.7.1 — a UI entry point for the knowledge graph

RayRAG v0.7.1

The knowledge graph has an entry point in the UI

The knowledge-graph panel (with its Build Graph button) has existed all along. Upstream v0.27.2 keeps
it out of the dataset sidebar — it is its own route, /knowledge-graph/:id — but nothing in RayRAG
linked to it, so from the user's side the feature simply was not there.

The dataset Overview panel now carries a Knowledge graph button pointing at
/dataset/knowledge-graph/{id}.

What I verified, and what I did not

Verified on the deployed build: the button exists, is visible, its href is correct, clicking it
navigates to that URL, and the page reports 0 errors.

Not verified: that the graph panel has rendered at that URL by the time the probe sampled it — two
seconds after the click #tab4 was not yet in the DOM. An earlier probe on the same URL did read the
panel and its Build Graph button, so it does render, but this release does not claim "confirmed
working". Confirming the render timing (or making that route activate the panel directly) and wiring
Build Graph to a real /datasets/{id}/graph are the next tasks.

Also in this release

The first insertion of the link left an extra </div>, and the existing UI test
dataset_panels_stay_siblings_of_the_overview_tab caught it immediately — the change was reverted and
redone div-neutral. 2136 tests pass, 0 failures.