feat(ui): add infinite scroll pagination to chat completions/responses logs table

## Summary:

  This commit adds infinite scroll pagination to the
  chat completions and responses tables.


## Test Plan:
  1. Run unit tests: npm run test
  2. Manual testing: Navigate to chat
  completions/responses pages
  3. Verify infinite scroll triggers when approaching
  bottom
  4. Added playwright tests: npm run test:e2e

llama_stack/ui/jest.setup.ts

@@ -0,0 +1,23 @@
+// Import llama-stack-client shims for Node environment
+import "llama-stack-client/shims/node";
+
+// Add any other global test setup here
+import "@testing-library/jest-dom";
+
+// Mock ResizeObserver globally
+global.ResizeObserver = class ResizeObserver {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+};
+
+// Mock IntersectionObserver globally
+global.IntersectionObserver = class IntersectionObserver {
+  constructor(callback: IntersectionObserverCallback) {}
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+  takeRecords() {
+    return [];
+  }
+} as any;