feat: Restructure UI with navigation and separate pages

- Add Navigation component with clean tab-based navigation
- Create StatusOverview component for main dashboard indicators
- Split functionality into separate pages:
  * Overview page with status and quick actions
  * Analysis page for AI analysis
  * Trading page for manual trading and history
  * Automation page for auto-trading settings
  * Settings page for developer configuration
- Add React dependencies to package.json
- Maintain clean separation of concerns

app/layout.tsx

@@ -1,5 +1,6 @@
 import './globals.css'
 import type { Metadata } from 'next'
+import Navigation from '../components/Navigation'
 
 export const metadata: Metadata = {
   title: 'Trading Bot Dashboard',
@@ -44,6 +45,9 @@ export default function RootLayout({ children }: { children: React.ReactNode })
             </div>
           </header>
 
+          {/* Navigation */}
+          <Navigation />
+
           {/* Main Content */}
           <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
             {children}