feat(FN-3086): enhance graph navigation with toolbar and keyboard controls

The merge introduces a new Cursor CLI plugin provider with dashboard authentication (FN-3396), enabling Fusion to bundle Cursor's CLI as a native AI model source alongside native shell guide and bridge contract documentation (FN-3577). It also completes the dependency graph plugin's navigation contr

Fusion-Task-Id: FN-3086

plugins/fusion-plugin-dependency-graph/src/__tests__/GraphToolbar.test.tsx

@@ -0,0 +1,60 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { cleanup, fireEvent, render, screen } from "@testing-library/react";
+import { GraphToolbar } from "../GraphToolbar";
+
+describe("GraphToolbar", () => {
+  afterEach(() => {
+    cleanup();
+  });
+  it("renders controls and zoom percent", () => {
+    render(
+      <GraphToolbar
+        zoom={1.25}
+        onZoomIn={vi.fn()}
+        onZoomOut={vi.fn()}
+        onFitToGraph={vi.fn()}
+        onResetView={vi.fn()}
+      />,
+    );
+
+    expect(screen.getByRole("button", { name: "Zoom in" })).toBeTruthy();
+    expect(screen.getByRole("button", { name: "Zoom out" })).toBeTruthy();
+    expect(screen.getByRole("button", { name: "Fit to graph" })).toBeTruthy();
+    expect(screen.getByRole("button", { name: "Reset view" })).toBeTruthy();
+    expect(screen.getByText("125%")).toBeTruthy();
+  });
+
+  it("fires callbacks", () => {
+    const onZoomIn = vi.fn();
+    const onZoomOut = vi.fn();
+    const onFitToGraph = vi.fn();
+    const onResetView = vi.fn();
+
+    render(
+      <GraphToolbar
+        zoom={1}
+        onZoomIn={onZoomIn}
+        onZoomOut={onZoomOut}
+        onFitToGraph={onFitToGraph}
+        onResetView={onResetView}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole("button", { name: "Zoom in" }));
+    fireEvent.click(screen.getByRole("button", { name: "Zoom out" }));
+    fireEvent.click(screen.getByRole("button", { name: "Fit to graph" }));
+    fireEvent.click(screen.getByRole("button", { name: "Reset view" }));
+
+    expect(onZoomIn).toHaveBeenCalledOnce();
+    expect(onZoomOut).toHaveBeenCalledOnce();
+    expect(onFitToGraph).toHaveBeenCalledOnce();
+    expect(onResetView).toHaveBeenCalledOnce();
+  });
+
+  it("applies toolbar class", () => {
+    render(
+      <GraphToolbar zoom={1} onZoomIn={vi.fn()} onZoomOut={vi.fn()} onFitToGraph={vi.fn()} onResetView={vi.fn()} />,
+    );
+    expect(screen.getByTestId("graph-toolbar").className).toContain("graph-toolbar");
+  });
+});