[FEAT] UI: guida online, landing EN, mobile-conversion, ai-assistant, bug-reporter + help/i18n

- public/guida.html, index-en.html, service-continuity.html
- public/js/ai-assistant.js, bug-reporter.js (FAB supporto)
- public/mobile-conversion.css/js
- index.html, common.js, help.js, risks.html: aggiornamenti UI/help

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

public/risks.html

@@ -479,7 +479,7 @@
             try {
                 const result = await api.listRisks(params);
                 if (result.success) {
-                    risksData = result.data || [];
+                    risksData = (result.data && result.data.items) || [];
                     renderRisksTable(risksData);
                 } else {
                     showNotification(result.message || 'Errore nel caricamento rischi', 'error');