added encryption

src/pages/SettingsPage.tsx

@@ -1,4 +1,4 @@
-import { useState, useEffect } from 'react'
+import { useState } from 'react'
 import { useAuth } from '../contexts/AuthContext'
 import { updateUserProfile } from '../lib/api'
 import BottomNav from '../components/BottomNav'
@@ -213,7 +213,7 @@ export default function SettingsPage() {
         )}
 
         {/* Clear Data */}
-        <button type="button" className="settings-clear-btn" onClick={handleClearData}>
+        <button type="button" className="settings-clear-btn" onClick={handleClearData} disabled>
           <span>Clear Local Data</span>
           <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
             <polyline points="3 6 5 6 21 6"></polyline>