feat: replace d3 canvas graph renderer with Sigma.js WebGL renderer

client/config/jest/sigmaMock.js

@@ -0,0 +1,100 @@
+/*
+ * SPDX-FileCopyrightText: © 2017-2026 Istari Digital, Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// Stand-in for `sigma` (and its subpath exports `sigma/rendering`,
+// `sigma/types`, `sigma/settings`, `sigma/utils`) under Jest: sigma v4's
+// ESM bundle references WebGL2RenderingContext at module load, which
+// doesn't exist in jsdom.
+
+class MockCamera {
+  animatedReset() {}
+  animate() {}
+  on() {
+    return this
+  }
+}
+
+class MockSigma {
+  constructor() {
+    this.state = new Map()
+    this.edgeState = new Map()
+    this.graphState = {}
+    this.listeners = new Map()
+  }
+
+  on(event, fn) {
+    const list = this.listeners.get(event) || []
+    list.push(fn)
+    this.listeners.set(event, list)
+    return this
+  }
+
+  emit(event, payload) {
+    const list = this.listeners.get(event) || []
+    list.forEach((fn) => fn(payload))
+  }
+
+  refresh() {}
+  kill() {}
+
+  getCamera() {
+    return new MockCamera()
+  }
+
+  getNodeDisplayData(uid) {
+    if (!this.graph || !this.graph.hasNode) {
+      return undefined
+    }
+    const attrs = this.graph.getNodeAttributes(uid)
+    return { x: attrs.x || 0, y: attrs.y || 0, size: attrs.size || 5 }
+  }
+
+  getEdgeDisplayData() {
+    return undefined
+  }
+
+  getNodeState(uid) {
+    return this.state.get(uid) || {}
+  }
+
+  setNodeState(uid, patch) {
+    const cur = this.state.get(uid) || {}
+    this.state.set(uid, { ...cur, ...patch })
+    return this
+  }
+
+  getEdgeState(key) {
+    return this.edgeState.get(key) || {}
+  }
+
+  setEdgeState(key, patch) {
+    const cur = this.edgeState.get(key) || {}
+    this.edgeState.set(key, { ...cur, ...patch })
+    return this
+  }
+
+  getGraphState() {
+    return this.graphState
+  }
+
+  setGraphState(patch) {
+    this.graphState = { ...this.graphState, ...patch }
+    return this
+  }
+}
+
+const stubProgram = {}
+
+module.exports = {
+  __esModule: true,
+  default: MockSigma,
+  Sigma: MockSigma,
+  extremityArrow: stubProgram,
+  layerFill: stubProgram,
+  layerPlain: stubProgram,
+  pathCurved: stubProgram,
+  pathLine: stubProgram,
+  sdfCircle: stubProgram,
+}