Add light mode toggle

frontend/src/components/StatusBar.tsx

@@ -1,9 +1,10 @@
-import { useState } from 'react';
-import { Menu } from 'lucide-react';
+import { useEffect, useState } from 'react';
+import { Menu, Moon, Sun } from 'lucide-react';
 import type { HealthStatus, RadioConfig } from '../types';
 import { api } from '../api';
 import { toast } from './ui/sonner';
 import { handleKeyboardActivate } from '../utils/a11y';
+import { applyTheme, getSavedTheme, THEME_CHANGE_EVENT } from '../utils/theme';
 import { cn } from '@/lib/utils';
 
 interface StatusBarProps {
@@ -29,6 +30,19 @@ export function StatusBar({
       ? 'Radio OK'
       : 'Radio Disconnected';
   const [reconnecting, setReconnecting] = useState(false);
+  const [currentTheme, setCurrentTheme] = useState(getSavedTheme);
+
+  useEffect(() => {
+    const handleThemeChange = (event: Event) => {
+      const themeId = (event as CustomEvent<string>).detail;
+      setCurrentTheme(typeof themeId === 'string' && themeId ? themeId : getSavedTheme());
+    };
+
+    window.addEventListener(THEME_CHANGE_EVENT, handleThemeChange as EventListener);
+    return () => {
+      window.removeEventListener(THEME_CHANGE_EVENT, handleThemeChange as EventListener);
+    };
+  }, []);
 
   const handleReconnect = async () => {
     setReconnecting(true);
@@ -46,6 +60,12 @@ export function StatusBar({
     }
   };
 
+  const handleThemeToggle = () => {
+    const nextTheme = currentTheme === 'light' ? 'original' : 'light';
+    applyTheme(nextTheme);
+    setCurrentTheme(nextTheme);
+  };
+
   return (
     <header className="flex items-center gap-3 px-4 py-2.5 bg-card border-b border-border text-xs">
       {/* Mobile menu button - only visible on small screens */}
@@ -128,6 +148,18 @@ export function StatusBar({
       >
         {settingsMode ? 'Back to Chat' : 'Settings'}
       </button>
+      <button
+        onClick={handleThemeToggle}
+        className="p-0.5 text-muted-foreground hover:text-foreground transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring rounded-sm"
+        title={currentTheme === 'light' ? 'Switch to classic theme' : 'Switch to light theme'}
+        aria-label={currentTheme === 'light' ? 'Switch to classic theme' : 'Switch to light theme'}
+      >
+        {currentTheme === 'light' ? (
+          <Sun className="h-4 w-4" aria-hidden="true" />
+        ) : (
+          <Moon className="h-4 w-4" aria-hidden="true" />
+        )}
+      </button>
     </header>
   );
 }

frontend/src/test/statusBar.test.tsx

@@ -1,4 +1,4 @@
-import { render, screen } from '@testing-library/react';
+import { fireEvent, render, screen } from '@testing-library/react';
 import { describe, expect, it, vi } from 'vitest';
 
 import { StatusBar } from '../components/StatusBar';
@@ -47,4 +47,21 @@ describe('StatusBar', () => {
     expect(screen.getByRole('status', { name: 'Radio Disconnected' })).toBeInTheDocument();
     expect(screen.getByRole('button', { name: 'Reconnect' })).toBeInTheDocument();
   });
+
+  it('toggles between classic and light themes from the shortcut button', () => {
+    localStorage.setItem('remoteterm-theme', 'cyberpunk');
+
+    render(<StatusBar health={baseHealth} config={null} onSettingsClick={vi.fn()} />);
+
+    const themeToggle = screen.getByRole('button', { name: 'Switch to light theme' });
+    fireEvent.click(themeToggle);
+
+    expect(localStorage.getItem('remoteterm-theme')).toBe('light');
+    expect(document.documentElement.dataset.theme).toBe('light');
+
+    fireEvent.click(screen.getByRole('button', { name: 'Switch to classic theme' }));
+
+    expect(localStorage.getItem('remoteterm-theme')).toBe('original');
+    expect(document.documentElement.dataset.theme).toBeUndefined();
+  });
 });

frontend/src/utils/theme.ts

@@ -7,6 +7,8 @@ export interface Theme {
   metaThemeColor: string;
 }
 
+export const THEME_CHANGE_EVENT = 'remoteterm-theme-change';
+
 export const THEMES: Theme[] = [
   {
     id: 'original',
@@ -77,4 +79,8 @@ export function applyTheme(themeId: string): void {
       meta.setAttribute('content', theme.metaThemeColor);
     }
   }
+
+  if (typeof window !== 'undefined') {
+    window.dispatchEvent(new CustomEvent(THEME_CHANGE_EVENT, { detail: themeId }));
+  }
 }