[FEAT] PWA installabile Android/iOS conforme AGID (v1.15.0)

- manifest.webmanifest + service worker (offline shell, /api network-only, asset stale-while-revalidate)
- set icone (192/512 + maskable + apple-touch + favicon), generate zero-deps (pure Node+zlib)
- tag PWA + viewport viewport-fit=cover (zoom mantenuto, WCAG 1.4.4) in 77 pagine HTML
- AGID/WCAG 2.1 AA: touch target >=44px, orientamento/zoom liberi, safe-area standalone
- generatori riproducibili: scripts/gen-pwa-icons.mjs + scripts/inject-pwa-head.mjs
- bump version 1.14.1 -> 1.15.0

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

public/css/style.css

@@ -2411,3 +2411,44 @@ tbody tr.clickable:active {
     .feedback-resolve-actions { flex-direction: column; }
     .feedback-password-row { flex-direction: column; }
 }
+
+/* ── PWA / AGID — Accessibilità mobile ──────────────────────────────
+   Touch target >= 44x44px (WCAG 2.5.5 / Linee guida di design AGID) e
+   gestione safe-area in modalità installata (notch). Solo aggiunte. */
+@media (pointer: coarse) {
+    .btn,
+    button,
+    input[type="submit"],
+    input[type="button"],
+    .nav-link,
+    .sidebar a,
+    a.btn,
+    .icon-btn,
+    .sidebar-toggle {
+        min-height: 44px;
+    }
+    .btn,
+    a.btn,
+    input[type="submit"],
+    input[type="button"],
+    .icon-btn {
+        display: inline-flex;
+        align-items: center;
+        justify-content: center;
+    }
+    .icon-btn,
+    .sidebar-toggle {
+        min-width: 44px;
+    }
+}
+
+/* Safe-area inset quando l'app gira installata (standalone) */
+@media all and (display-mode: standalone) {
+    .content-header { padding-top: max(16px, env(safe-area-inset-top)); }
+    .main-content {
+        padding-left: env(safe-area-inset-left);
+        padding-right: env(safe-area-inset-right);
+        padding-bottom: env(safe-area-inset-bottom);
+    }
+    .sidebar { padding-top: env(safe-area-inset-top); }
+}