fix(css): collapse ad slots initially to prevent layout shift

- Slots start with max-height:0, opacity:0, margin:0 (no visual space)
- Only expand when AdSense confirms filled status
- Use transition for smooth appearance
- Prevents layout shift when unfilled slots are hidden
- Combined with larger rootMargin (1000px) slots are pre-loaded
  before entering viewport, eliminating visible collapse

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

functions.php

@@ -18,7 +18,7 @@ if (!defined('ABSPATH')) {
 }
 
 // Definir constante de versión del tema
-define('ROI_VERSION', '1.0.24');
+define('ROI_VERSION', '1.0.25');
 
 // =============================================================================
 // 1. CARGAR AUTOLOADER MANUAL