feat(KB-502): add dashboard multi-project hooks and project API routes

- Add project API routes for multi-project backend integration
- Create useProjects hook for listing and managing registered projects
- Create useCurrentProject hook for current project selection and switching
- Create useProjectHealth hook for real-time project health metrics
- Create useActivityLog hook with ActivityLogModal integration
- Add comprehensive test coverage for all hooks (useProjects, useCurrentProject, useActivityLog)
- Add test setup utilities for React Query mocking

packages/dashboard/app/test/setup.ts

@@ -0,0 +1,60 @@
+import { vi } from "vitest";
+
+// Extend localStorage mock for multi-project tests
+const localStorageMock: Record<string, string> = {};
+
+if (typeof window !== "undefined") {
+  Object.defineProperty(window, "localStorage", {
+    value: {
+      getItem: (key: string) => localStorageMock[key] || null,
+      setItem: (key: string, value: string) => {
+        localStorageMock[key] = value;
+      },
+      removeItem: (key: string) => {
+        delete localStorageMock[key];
+      },
+      clear: () => {
+        Object.keys(localStorageMock).forEach((key) => delete localStorageMock[key]);
+      },
+    },
+    writable: true,
+  });
+}
+
+// Mock fetch for project API tests
+const originalFetch = globalThis.fetch;
+
+globalThis.fetch = vi.fn(async (url: RequestInfo | URL) => {
+  const urlString = url.toString();
+  
+  // Mock project API responses
+  if (urlString.includes("/api/projects")) {
+    return {
+      ok: true,
+      status: 200,
+      json: async () => [],
+      text: async () => "[]",
+      headers: new Headers({ "content-type": "application/json" }),
+    } as Response;
+  }
+  
+  // Default: return empty successful response
+  return {
+    ok: true,
+    status: 200,
+    json: async () => ({}),
+    text: async () => "{}",
+    headers: new Headers({ "content-type": "application/json" }),
+  } as Response;
+}) as typeof fetch;
+
+// Cleanup
+afterEach(() => {
+  // Clear localStorage mock
+  Object.keys(localStorageMock).forEach((key) => delete localStorageMock[key]);
+  
+  // Reset fetch mock
+  vi.mocked(globalThis.fetch).mockClear();
+});
+
+export { localStorageMock };