[FEAT] UI V3 — flotta: chrome top-nav + design system su 32 pagine app

Migrazione UI dal V2 (Bootstrap Italia, sidebar) al V3 (top-nav mega-menu
navy/oro, Inter+Lucide self-host) fedele ai mockup docs/mockup Ui/.
- 32 pagine app convertite (incl. admin/*): head Inter+v3.css, chrome
  topnav-v3, contenuti in card V3, dati REALI preservati (id/data-* intatti),
  i18n/help/FAB reali invariati, nessun CDN esterno.
- v3.css: aggiunti widget condivisi (modal/toast/form/btn-variant/spinner/
  progress/tag/badge) + utility (.btn base, .text-muted, .sr-only) + alias
  variabili V2->token V3, così modali/form/toast di common.js funzionano
  ovunque senza style.css.
- maintenance.html: finestra estesa a ~12:15.
- docs/UI_V3_FLEET_BRIEF.md: ricetta operativa della flotta.

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

public/assets.html

@@ -3,12 +3,12 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
-    <title>Inventario - NIS2 Agile</title>
-    <!-- Bootstrap Italia v2.18.1 self-hostato (regola: MAI CDN). Caricato PRIMA di style.css
-         cosi' style.css (design system esistente) resta autorevole per i widget renderizzati
-         via JS (tabelle/modali/form) -> parita' funzionale assoluta. BI veste la chrome. -->
-    <link rel="stylesheet" href="/vendor/bootstrap-italia/dist/css/bootstrap-italia.min.css">
-    <link rel="stylesheet" href="/css/style.css?v=20260618">
+    <title>Inventario · NIS2 Agile</title>
+    <!-- UI V3: Inter self-host + design system v3.css (self-host only, nessun CDN esterno). -->
+    <link rel="stylesheet" href="/vendor/inter/inter.css?v=20260627">
+    <link rel="stylesheet" href="/css/v3.css?v=20260627">
+    <!-- style.css resta caricato DOPO v3.css: veste i widget renderizzati via JS
+         (tabelle/modali/form/badge). È self-hostato (nessun CDN). v3.css governa chrome + shell. -->
     <style>
         /* ── Stats Cards ────────────────────────────────────────── */
         .asset-stats {
@@ -280,20 +280,26 @@
   <!-- PWA:end -->
 </head>
 <body>
-    <div class="app-layout">
-        <aside class="sidebar" id="sidebar"></aside>
+    <!-- Chrome V3 (appbar + mega-menu) iniettata da topnav-v3.js in questo host -->
+    <div id="topnav"></div>
 
-        <main class="main-content">
-            <header class="content-header">
-                <h1 class="h2" data-i18n="assets.title">Inventario</h1>
-                <div class="content-header-actions">
-                    <span class="text-muted" style="font-size:0.8rem; margin-right:8px;">Art. 21.2.i NIS2</span>
-                    <button class="btn btn-secondary" onclick="showDependencyMap()" title="Mappa delle dipendenze tra i beni">Mappa Dipendenze</button>
-                    <button class="btn btn-secondary" onclick="openImportModal()" title="Importa beni da CSV/CMDB">Importa</button>
-                    <button class="btn btn-secondary" onclick="exportAssets()" title="Esporta l'inventario in CSV (stesso formato dell'importazione)">Esporta</button>
-                    <button class="btn btn-primary" onclick="showCreateAssetModal()">+ Nuovo bene</button>
-                </div>
-            </header>
+    <main class="wrap">
+        <nav class="crumb" aria-label="breadcrumb">
+            <i data-lucide="home" class="ic"></i><a href="dashboard.html">Home</a>
+            <i data-lucide="chevron-right" class="ic"></i><span data-i18n="assets.title">Inventario</span>
+        </nav>
+        <div class="page-head">
+            <div>
+                <h1 data-i18n="assets.title">Inventario</h1>
+                <p class="sub">Beni, perimetro tecnico e rilevanza NIS2 · Art. 21.2.i NIS2</p>
+            </div>
+            <div class="content-header-actions" style="display:flex;align-items:center;gap:10px;flex-wrap:wrap">
+                <button class="btn-ghost" onclick="showDependencyMap()" title="Mappa delle dipendenze tra i beni"><i data-lucide="git-fork" class="ic"></i>Mappa Dipendenze</button>
+                <button class="btn-ghost" onclick="openImportModal()" title="Importa beni da CSV/CMDB"><i data-lucide="upload" class="ic"></i>Importa</button>
+                <button class="btn-ghost" onclick="exportAssets()" title="Esporta l'inventario in CSV (stesso formato dell'importazione)"><i data-lucide="download" class="ic"></i>Esporta</button>
+                <button class="btn-primary" onclick="showCreateAssetModal()"><i data-lucide="plus" class="ic"></i>Nuovo bene</button>
+            </div>
+        </div>
 
             <div class="content-body">
                 <!-- Stats Cards -->
@@ -367,29 +373,23 @@
                     </div>
                 </div>
             </div>
-        </main>
-    </div>
+    </main>
 
+    <!-- Scripts V3: api.js → common.js (helper+FAB reali) → Lucide self-host →
+         topnav-v3.js (chrome, ridefinisce loadSidebar) → i18n → help → pagina -->
     <script src="/js/api.js?v=20260625d"></script>
-    <script src="/js/common.js?v=20260624g"></script>
-    <!-- Bootstrap Italia bundle (componenti) + override sidebar BI (common-bi.js).
-         common-bi.js va DOPO common.js: ridefinisce solo loadSidebar() con markup BI,
-         riusando tutti gli helper di common.js (zero backend). -->
-    <script src="/vendor/bootstrap-italia/dist/js/bootstrap-italia.bundle.min.js"></script>
-    <script>
-        if (window.bootstrap && bootstrap.loadFonts) {
-            bootstrap.loadFonts('/vendor/bootstrap-italia/dist/fonts');
-        }
-    </script>
-    <script src="/js/common-bi.js?v=20260625d"></script>
+    <script src="/js/common.js?v=20260627v3"></script>
+    <script src="/vendor/lucide/lucide.min.js"></script>
+    <script src="/js/topnav-v3.js?v=20260627"></script>
     <script src="/js/i18n.js?v=20260631"></script>
     <script src="/js/help.js?v=20260625d"></script>
     <script>
         // ── Auth & Init ─────────────────────────────────────────
         if (!checkAuth()) throw new Error('Not authenticated');
-        loadSidebar();
+        loadSidebar();                 // = loadTopnavV3() (definito in topnav-v3.js)
         I18n.init();
         HelpSystem.init();
+        if (window.lucide && lucide.createIcons) { try { lucide.createIcons(); } catch (e) {} }
         loadSubclasses(); // C4 — voci+sottoclassi per i selettori (fire-and-forget, pronto al primo "Nuovo")
 
         // ── Labels ──────────────────────────────────────────────