feat(frontend): add keyboard shortcuts to ChatInput.tsx

- Add Cmd/Ctrl+N for new chat
- Add Cmd/Ctrl+H for open history
- Add Cmd/Ctrl+B for open bridge modal
- Add Cmd/Ctrl+Shift+C for cancel request
- Add comprehensive unit tests for all keyboard shortcuts
- Ensure no regressions in existing functionality

Closes #561

Author: Marvy

dex_with_fiat_frontend/src/components/ChatInput.tsx

@@ -181,10 +181,26 @@ export default function ChatInput({
         event.preventDefault();
         setShowPalette((prev: boolean) => !prev);
       }
+      if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === 'n' && !event.shiftKey) {
+        event.preventDefault();
+        onNewChat?.();
+      }
+      if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === 'h') {
+        event.preventDefault();
+        onOpenHistory?.();
+      }
+      if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === 'b') {
+        event.preventDefault();
+        onOpenBridgeModal?.();
+      }
+      if ((event.metaKey || event.ctrlKey) && event.shiftKey && event.key.toLowerCase() === 'c') {
+        event.preventDefault();
+        onCancelRequest?.();
+      }
     };
     window.addEventListener('keydown', handler);
     return () => window.removeEventListener('keydown', handler);
-  }, []);
+  }, [onNewChat, onOpenHistory, onOpenBridgeModal, onCancelRequest]);
 
   // Load draft when session changes
   useEffect(() => {

dex_with_fiat_frontend/src/components/__tests__/ChatInput.keyboard-shortcuts.test.tsx

@@ -0,0 +1,130 @@
+import React from 'react';
+import { render, screen, fireEvent } from '@testing-library/react';
+import ChatInput from '../ChatInput';
+
+// Mock the translation context
+jest.mock('@/contexts/TranslationContext', () => ({
+  useTranslation: () => ({
+    t: (key: string) => key,
+  }),
+}));
+
+// Mock draft utils
+jest.mock('@/lib/draftUtils', () => ({
+  saveDraft: jest.fn(),
+  getDraft: jest.fn(() => ''),
+  clearDraft: jest.fn(),
+}));
+
+// Mock StellarWalletContext
+jest.mock('@/contexts/StellarWalletContext', () => ({
+  useStellarWallet: () => ({
+    connection: {
+      isConnected: true,
+      address: 'GABC123',
+      publicKey: 'GABC123',
+      network: 'testnet',
+      networkPassphrase: '',
+    },
+  }),
+}));
+
+describe('ChatInput - Keyboard Shortcuts', () => {
+  const mockOnSendMessage = jest.fn();
+  const mockOnCancelRequest = jest.fn();
+  const mockOnNewChat = jest.fn();
+  const mockOnOpenHistory = jest.fn();
+  const mockOnOpenBridgeModal = jest.fn();
+
+  const defaultProps = {
+    onSendMessage: mockOnSendMessage,
+    onCancelRequest: mockOnCancelRequest,
+    onNewChat: mockOnNewChat,
+    onOpenHistory: mockOnOpenHistory,
+    onOpenBridgeModal: mockOnOpenBridgeModal,
+    isLoading: false,
+    placeholder: 'Type a message...',
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should trigger new chat with Cmd+N', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'n', metaKey: true });
+    expect(mockOnNewChat).toHaveBeenCalledTimes(1);
+  });
+
+  it('should trigger new chat with Ctrl+N', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'n', ctrlKey: true });
+    expect(mockOnNewChat).toHaveBeenCalledTimes(1);
+  });
+
+  it('should not trigger new chat with Shift+Cmd+N', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'n', metaKey: true, shiftKey: true });
+    expect(mockOnNewChat).not.toHaveBeenCalled();
+  });
+
+  it('should trigger open history with Cmd+H', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'h', metaKey: true });
+    expect(mockOnOpenHistory).toHaveBeenCalledTimes(1);
+  });
+
+  it('should trigger open history with Ctrl+H', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'h', ctrlKey: true });
+    expect(mockOnOpenHistory).toHaveBeenCalledTimes(1);
+  });
+
+  it('should trigger open bridge modal with Cmd+B', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'b', metaKey: true });
+    expect(mockOnOpenBridgeModal).toHaveBeenCalledTimes(1);
+  });
+
+  it('should trigger open bridge modal with Ctrl+B', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'b', ctrlKey: true });
+    expect(mockOnOpenBridgeModal).toHaveBeenCalledTimes(1);
+  });
+
+  it('should trigger cancel request with Cmd+Shift+C', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'c', metaKey: true, shiftKey: true });
+    expect(mockOnCancelRequest).toHaveBeenCalledTimes(1);
+  });
+
+  it('should trigger cancel request with Ctrl+Shift+C', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'c', ctrlKey: true, shiftKey: true });
+    expect(mockOnCancelRequest).toHaveBeenCalledTimes(1);
+  });
+
+  it('should not trigger cancel request with Cmd+C', () => {
+    render(<ChatInput {...defaultProps} />);
+    fireEvent.keyDown(window, { key: 'c', metaKey: true });
+    expect(mockOnCancelRequest).not.toHaveBeenCalled();
+  });
+
+  it('should toggle command palette with Cmd+K', () => {
+    render(<ChatInput {...defaultProps} />);
+    expect(screen.queryByPlaceholderText('Type a command...')).not.toBeInTheDocument();
+    fireEvent.keyDown(window, { key: 'k', metaKey: true });
+    expect(screen.getByPlaceholderText('Type a command...')).toBeInTheDocument();
+    fireEvent.keyDown(window, { key: 'k', metaKey: true });
+    expect(screen.queryByPlaceholderText('Type a command...')).not.toBeInTheDocument();
+  });
+
+  it('should toggle command palette with Ctrl+K', () => {
+    render(<ChatInput {...defaultProps} />);
+    expect(screen.queryByPlaceholderText('Type a command...')).not.toBeInTheDocument();
+    fireEvent.keyDown(window, { key: 'k', ctrlKey: true });
+    expect(screen.getByPlaceholderText('Type a command...')).toBeInTheDocument();
+    fireEvent.keyDown(window, { key: 'k', ctrlKey: true });
+    expect(screen.queryByPlaceholderText('Type a command...')).not.toBeInTheDocument();
+  });
+});