fix(topology): drop redundant union with unknown in test helper

SonarCloud flagged typescript:S6571 — `ReturnType<typeof node> | unknown`
collapses to just `unknown`. Use `unknown` directly for the source/target
parameters of the wireEdge helper.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: lhein

packages/ui/src/pages/Topology/OrthogonalBendpointsEdge.test.ts

@@ -8,12 +8,7 @@ const node = (pos: { x: number; y: number }, size: { width: number; height: numb
   getDimensions: () => size,
 });
 
-const wireEdge = (
-  edge: OrthogonalBendpointsEdge,
-  layout: string,
-  source: ReturnType<typeof node> | unknown,
-  target: ReturnType<typeof node> | unknown,
-) => {
+const wireEdge = (edge: OrthogonalBendpointsEdge, layout: string, source: unknown, target: unknown) => {
   jest.spyOn(edge, 'getSource').mockReturnValue(source as never);
   jest.spyOn(edge, 'getTarget').mockReturnValue(target as never);
   jest.spyOn(edge, 'getGraph').mockReturnValue({ getLayout: () => layout } as never);