Standardize wordpress-cron-manager.sh menu validation and colors

- Add ${CYAN}...${NC} color codes to all menu option numbers
- Add ${RED}0)${NC} color code to back/exit option
- Implement input validation with retry loop for menu choice (0-8)
- Add visual separator line before menu prompt
- Ensure users can retry after invalid input

This standardizes the script to match menu uniformity standards documented in REFDB_FORMAT.txt

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

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

@@ -162,25 +162,38 @@ echo ""
 echo -e "${BOLD}What would you like to do?${NC}"
 echo ""
 echo -e "${GREEN}Enable System Cron:${NC}"
-echo "  1) Scan for WordPress installations"
-echo "  2) Disable wp-cron for specific domain"
-echo "  3) Disable wp-cron for specific user (all their WP sites)"
-echo "  4) Disable wp-cron server-wide (all WordPress sites)"
+echo -e "  ${CYAN}1)${NC} Scan for WordPress installations"
+echo -e "  ${CYAN}2)${NC} Disable wp-cron for specific domain"
+echo -e "  ${CYAN}3)${NC} Disable wp-cron for specific user (all their WP sites)"
+echo -e "  ${CYAN}4)${NC} Disable wp-cron server-wide (all WordPress sites)"
 echo ""
 echo -e "${YELLOW}Revert to WP-Cron:${NC}"
-echo "  6) Re-enable wp-cron for specific domain"
-echo "  7) Re-enable wp-cron for specific user (all their WP sites)"
-echo "  8) Re-enable wp-cron server-wide (all WordPress sites)"
+echo -e "  ${CYAN}6)${NC} Re-enable wp-cron for specific domain"
+echo -e "  ${CYAN}7)${NC} Re-enable wp-cron for specific user (all their WP sites)"
+echo -e "  ${CYAN}8)${NC} Re-enable wp-cron server-wide (all WordPress sites)"
 echo ""
 echo -e "${CYAN}Status & Information:${NC}"
-echo "  5) Check wp-cron status for domain/user"
+echo -e "  ${CYAN}5)${NC} Check wp-cron status for domain/user"
 echo ""
-echo "  0) Return to menu"
+echo -e "  ${RED}0)${NC} Return to menu"
 echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
 echo -n "Select option [0]: "
+
+# Validate choice input
+while true; do
     read -r choice
     choice="${choice:-0}"
 
+    if ! [[ "$choice" =~ ^[0-8]$ ]]; then
+        echo ""
+        print_error "Invalid choice. Please enter 0-8"
+        echo ""
+        continue
+    fi
+    break
+done
+
 case "$choice" in
     1)
         # Scan for WordPress installations