Add cancel/back options to all user input prompts

Changes:
- Added "0) Cancel" option to all menu prompts
- Added "(or 0 to cancel)" to all text input prompts
- Ensures users can back out of any operation at any time
- Scripts affected:
  - website-error-analyzer.sh (scope selection, time range)
  - 500-error-tracker.sh (time range selection)
  - wordpress-cron-manager.sh (all domain/user input prompts, status checks)

User Experience Improvements:
- No more being trapped in prompts
- Clear cancel instructions on every input
- Consistent "Operation cancelled" messaging
- Proper exit codes (0 for user cancellation)

Tested:
✓ website-error-analyzer.sh - cancel on scope selection
✓ 500-error-tracker.sh - cancel on time selection
✓ wordpress-cron-manager.sh - cancel on domain/user input
✓ All cancellations return cleanly to menu

https://claude.com/claude-code

modules/website/500-error-tracker.sh

@@ -26,11 +26,18 @@ echo -e "${CYAN}How far back to scan?${NC}"
 echo "  1) Last 24 hours (default)"
 echo "  2) Last 7 days"
 echo "  3) Last 30 days"
+echo "  0) Cancel and return to menu"
 echo ""
 read -p "Select option [1]: " time_choice
 time_choice=${time_choice:-1}
 
 case $time_choice in
+    0)
+        echo ""
+        echo "Scan cancelled."
+        echo ""
+        exit 0
+        ;;
     1) HOURS_TO_SCAN=24 ;;
     2) HOURS_TO_SCAN=168 ;;
     3) HOURS_TO_SCAN=720 ;;