Initial skeleton for web application

web/src/test/setup.ts

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+import '@testing-library/jest-dom';
+import { vi } from 'vitest';
+
+// Mock for window.matchMedia
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: vi.fn().mockImplementation((query: string) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});
+
+// Mock for ResizeObserver
+window.ResizeObserver = vi.fn().mockImplementation(() => ({
+  observe: vi.fn(),
+  unobserve: vi.fn(),
+  disconnect: vi.fn(),
+}));
+
+// Mock for EventSource
+class MockEventSource {
+  onmessage: ((event: any) => void) | null = null;
+  onerror: ((event: any) => void) | null = null;
+  
+  constructor(public url: string) {}
+  
+  close() {
+    // Do nothing
+  }
+  
+  addEventListener(event: string, callback: (event: any) => void) {
+    if (event === 'message') {
+      this.onmessage = callback;
+    } else if (event === 'error') {
+      this.onerror = callback;
+    }
+  }
+  
+  removeEventListener(event: string, callback: (event: any) => void) {
+    if (event === 'message' && this.onmessage === callback) {
+      this.onmessage = null;
+    } else if (event === 'error' && this.onerror === callback) {
+      this.onerror = null;
+    }
+  }
+}
+
+// Override EventSource globally
+window.EventSource = MockEventSource as any;