feat(FN-3307): add pinch-to-zoom, auto-fit, mobile layout, and empty state

Merges five branches: adds pinch-to-zoom, mobile layout, auto-fit, and empty state to the dependency graph plugin with full test coverage; implements API key fallback resolution for models.json; restores Claude usage tracking with Fusion Anthropic auth storage; and boosts dashboard test performance

Fusion-Task-Id: FN-3307

plugins/fusion-plugin-dependency-graph/vitest.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig } from "vitest/config";
+import { fileURLToPath } from "node:url";
+import { computeMaxWorkers } from "../../packages/core/src/__test-utils__/vitest-workers";
+
+const maxWorkers = computeMaxWorkers();
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      "@fusion/core": fileURLToPath(new URL("../../packages/core/src/index.ts", import.meta.url)),
+      "@fusion/plugin-sdk": fileURLToPath(new URL("../../packages/plugin-sdk/src/index.ts", import.meta.url)),
+    },
+  },
+  test: {
+    include: ["src/**/*.test.{ts,tsx}"],
+    environment: "jsdom",
+    setupFiles: [fileURLToPath(new URL("../../packages/core/src/__test-utils__/vitest-setup.ts", import.meta.url))],
+    globalSetup: [fileURLToPath(new URL("../../packages/core/src/__test-utils__/vitest-teardown.ts", import.meta.url))],
+    pool: "threads",
+    maxWorkers,
+    poolOptions: { threads: { minThreads: 1, maxThreads: maxWorkers }, forks: { minForks: 1, maxForks: maxWorkers } },
+  },
+});