Add color codes and validation to wordpress-cron-manager.sh sub-menu

- Add ${CYAN}...${NC} color codes to status check sub-menu options
- Add ${RED}0)${NC} color code to cancel option
- Implement input validation with retry loop for check_choice (0-2)
- Add visual separator line before sub-menu prompt

This completes menu uniformity standardization for this script.

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

modules/website/wordpress/wordpress-cron-manager.sh

@@ -589,14 +589,27 @@ case "$choice" in
         # Check status
         echo ""
         echo "Check wp-cron status for:"
-        echo "  1) Specific domain"
-        echo "  2) Specific user"
-        echo "  0) Cancel"
+        echo -e "  ${CYAN}1)${NC} Specific domain"
+        echo -e "  ${CYAN}2)${NC} Specific user"
+        echo -e "  ${RED}0)${NC} Cancel"
         echo ""
+        echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+
+        # Validate check_choice input
+        while true; do
             echo -n "Select [1]: "
             read -r check_choice
             check_choice="${check_choice:-1}"
 
+            if ! [[ "$check_choice" =~ ^[0-2]$ ]]; then
+                echo ""
+                print_error "Invalid choice. Please enter 0, 1, or 2"
+                echo ""
+                continue
+            fi
+            break
+        done
+
         if [ "$check_choice" = "0" ]; then
             echo "Operation cancelled."
             press_enter