feat: admin auto-solve button for quick level testing

- Add adminMode toggle in AdminPanel (green "Admin ON/OFF" button)
- Pass adminMode through GameApp → PuzzleView
- Show purple "🛠 Resolver" button in puzzle toolbar when admin is active
- Auto-solve gives 3 stars instantly and shows completion overlay
- Lets admin skip through all 96 levels for rapid testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/game/AdminPanel.jsx

@@ -5,7 +5,7 @@
 import React, { useState } from 'react';
 import { loadProgress, saveProgress, resetProgress } from './gameState.js';
 
-export default function AdminPanel({ worlds, onClose }) {
+export default function AdminPanel({ worlds, onClose, adminMode, onToggleAdmin }) {
   const [, refresh] = useState(0);
   const p = loadProgress();
   const totalStars = Object.values(p.completedLevels).reduce((s, l) => s + (l.stars || 0), 0);
@@ -63,6 +63,12 @@ export default function AdminPanel({ worlds, onClose }) {
         </div>
 
         <div className="admin-actions">
+          <button
+            className={`admin-action-btn ${adminMode ? 'active' : ''}`}
+            onClick={onToggleAdmin}
+          >
+            {adminMode ? '🛠 Admin ON' : '🛠 Admin OFF'}
+          </button>
           <button className="admin-action-btn gold" onClick={giveAllStars}>★★★ Todo</button>
           <button className="admin-action-btn danger" onClick={handleReset}>Reset Progreso</button>
         </div>