[DOCS] Help: HelpSystem.init su normative + companies (edit prima falliti)

Nel commit 3e5b75b gli edit a normative.html e companies.html erano falliti
(file-not-read / string-not-found): il pulsante '?' non partiva. Ora corretti.
Verificato: tutte e 4 le pagine (whistleblowing/normative/companies/kb) hanno
help.js + HelpSystem.init=1.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

public/companies.html

@@ -348,6 +348,7 @@
         }
 
         loadSidebar();
+        if (typeof HelpSystem !== 'undefined') HelpSystem.init();
 
         // ── Data ────────────────────────────────────────────────────────
         let allCompanies = [];

public/normative.html

@@ -101,6 +101,7 @@
         if (!checkAuth()) throw new Error('Not authenticated');
         loadSidebar();
         I18n.init();
+        if (typeof HelpSystem !== 'undefined') HelpSystem.init();
 
         const sourceLabels = {
             nis2_directive: 'NIS2 Directive', dlgs_138_2024: 'D.Lgs. 138/2024',