Version 1.4.10 - security hardening, empty fallback, and reCAPTCHA improvements

- Harden XSS protection with escapeHtml on all rendered output values
- Add empty_fallback support for empty cell display across all view types
- Fix reCAPTCHA default action to 'submit' matching JS side
- Move reCAPTCHA token generation from inline PHP to public.js
- Lower default reCAPTCHA min score from 0.5 to 0.3
- Improve reCAPTCHA token age check and preload error handling
- Add form submit handler for enter key support
- Increase waitForRecaptcha timeout to 10 seconds
- Show button/color settings only for button output types
- Remove debug console.log and error_log statements
- Bump version to 1.4.10

includes/class-Sheet-Data-Checker-Pro.php

@@ -504,6 +504,7 @@ class SHEET_DATA_CHECKER_PRO
                     'type' => isset($checker['output'][$id]['type']) ? $checker['output'][$id]['type'] : 'text',
                     'button_text' => isset($checker['output'][$id]['button_text']) ? $checker['output'][$id]['button_text'] : '',
                     'prefix' => isset($checker['output'][$id]['prefix']) ? $checker['output'][$id]['prefix'] : '',
+                    'empty_fallback' => isset($checker['output'][$id]['empty_fallback']) ? $checker['output'][$id]['empty_fallback'] : '',
                     'bg_color' => isset($checker['output'][$id]['bg_color']) ? $checker['output'][$id]['bg_color'] : '#cccccc',
                     'text_color' => isset($checker['output'][$id]['text_color']) ? $checker['output'][$id]['text_color'] : '#000000',
                     'display' => isset($checker['result']['display']) && $checker['result']['display'] == 'card'