fix: Add Analytics navigation button to main header

- Add Analytics button to navigation menu between Themes and Docs
- Dashboard accessible via navigation or direct URL hash #analytics

Author: shankerram3

frontend/src/App.tsx

@@ -158,6 +158,14 @@ export default function App() {
               <span style={styles.navIcon}>🎨</span>
               <span>Recurring Themes</span>
             </button>
+            <button
+              data-nav-button
+              style={{ ...styles.navButton, ...(activeTab === 'analytics' ? styles.navButtonActive : {}) }}
+              onClick={() => { setActiveTab('analytics'); window.location.hash = 'analytics'; }}
+            >
+              <span style={styles.navIcon}>📈</span>
+              <span>Analytics</span>
+            </button>
             <button
               data-nav-button
               style={{ ...styles.navButton, ...(activeTab === 'docs' ? styles.navButtonActive : {}) }}