feat: Add comprehensive test suite and misc improvements

- Add frontend unit tests with Vitest for components, hooks, pages, and utilities
- Add backend tests for webhooks, notifications, middleware, and edge cases
- Add ForgotPassword, NotFound, and ResetPassword pages
- Add migration for orphaned staff resources conversion
- Add coverage directory to gitignore (generated reports)
- Various bug fixes and improvements from previous work

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/test/setup.ts

@@ -0,0 +1,58 @@
+import '@testing-library/jest-dom';
+import { vi } from 'vitest';
+
+// Mock window.matchMedia
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: vi.fn().mockImplementation((query) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: vi.fn(),
+    removeListener: vi.fn(),
+    addEventListener: vi.fn(),
+    removeEventListener: vi.fn(),
+    dispatchEvent: vi.fn(),
+  })),
+});
+
+// Mock ResizeObserver
+global.ResizeObserver = vi.fn().mockImplementation(() => ({
+  observe: vi.fn(),
+  unobserve: vi.fn(),
+  disconnect: vi.fn(),
+}));
+
+// Mock IntersectionObserver
+global.IntersectionObserver = vi.fn().mockImplementation(() => ({
+  observe: vi.fn(),
+  unobserve: vi.fn(),
+  disconnect: vi.fn(),
+}));
+
+// Mock scrollTo
+window.scrollTo = vi.fn();
+
+// Mock localStorage with actual storage behavior
+const createLocalStorageMock = () => {
+  let store: Record<string, string> = {};
+  return {
+    getItem: vi.fn((key: string) => store[key] || null),
+    setItem: vi.fn((key: string, value: string) => {
+      store[key] = value;
+    }),
+    removeItem: vi.fn((key: string) => {
+      delete store[key];
+    }),
+    clear: vi.fn(() => {
+      store = {};
+    }),
+    get length() {
+      return Object.keys(store).length;
+    },
+    key: vi.fn((index: number) => Object.keys(store)[index] || null),
+  };
+};
+
+const localStorageMock = createLocalStorageMock();
+Object.defineProperty(window, 'localStorage', { value: localStorageMock });