Add a maintenance pause/resume switch and a proper user navbar

RoundConfig gets a paused flag toggled via new POST /admin/pause and
/admin/resume endpoints (audit-logged, surfaced as a "Manutenzione" card in
the admin Parametri view). Pausing only stops the *next* round from opening
once the current one closes — rounds/service.py:open_new_round_if_needed
still lets an in-progress round finish, draw, and pay out its winner
normally. GET /rounds/current exposes lottery_paused so the user page shows
a maintenance banner (even while logged out) instead of silently going idle.

Also replaces the user dashboard's stacked account-bar card + bento-grid
menu with a single sticky navbar (identity row + Deposito/Bet/Prelievo
tabs), and moves the page content into a dedicated .app-shell container so
the navbar itself can span full width.

app/static/index.html

@@ -30,17 +30,12 @@
     font-family: 'Fira Sans', system-ui, sans-serif;
     background: var(--color-background);
     color: var(--color-foreground);
-    max-width: 480px;
-    margin: 0 auto;
-    padding: 32px 20px 80px;
     line-height: 1.5;
   }
 
-  .mono { font-family: 'Fira Code', monospace; }
+  .app-shell { max-width: 480px; margin: 0 auto; padding: 24px 20px 80px; }
 
-  header { margin-bottom: 24px; }
-  header h1 { font-size: 1.375rem; font-weight: 700; margin: 0; letter-spacing: -0.01em; }
-  header p { color: var(--color-muted-foreground); font-size: 0.9rem; margin: 4px 0 0; }
+  .mono { font-family: 'Fira Code', monospace; }
 
   .card {
     background: var(--color-surface);
@@ -102,11 +97,37 @@
   }
   button.link:hover { filter: none; color: var(--color-foreground); }
 
-  .account-bar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
-  .account-bar .name { font-weight: 600; }
-
   .row-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
 
+  /* --- sticky app navbar: identity row + section tabs, shown only when logged in --- */
+  .app-navbar {
+    position: sticky; top: 0; z-index: 20;
+    background: color-mix(in srgb, var(--color-surface) 92%, transparent);
+    backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
+    border-bottom: 1px solid var(--color-border); margin-bottom: 20px;
+  }
+  .app-navbar-top {
+    max-width: 480px; margin: 0 auto; padding: 12px 20px 8px;
+    display: flex; align-items: center; justify-content: space-between; gap: 12px;
+  }
+  .app-navbar-top .brand { font-weight: 700; font-size: 1rem; letter-spacing: -0.01em; }
+  .app-navbar-account { display: flex; align-items: center; gap: 10px; }
+  .app-navbar-account .name { font-weight: 600; font-size: 0.85rem; }
+
+  .app-navbar-tabs { max-width: 480px; margin: 0 auto; padding: 0 12px; display: flex; }
+  .app-navbar-tabs button.navbar-tab {
+    flex: 1; width: auto; min-height: auto; margin-top: 0; padding: 8px 4px 10px;
+    display: flex; flex-direction: column; align-items: center; gap: 3px;
+    font-size: 0.72rem; font-weight: 600; font-family: inherit; cursor: pointer;
+    background: none; color: var(--color-muted-foreground);
+    border: none; border-bottom: 2px solid transparent; margin-bottom: -1px;
+    transition: color 150ms, border-color 150ms;
+  }
+  .app-navbar-tabs button.navbar-tab .icon { width: 18px; height: 18px; }
+  .app-navbar-tabs button.navbar-tab.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
+  .app-navbar-tabs button.navbar-tab:hover { filter: none; color: var(--color-foreground); }
+  .app-navbar-tabs button.navbar-tab.active:hover { color: var(--color-primary); }
+
   .address-box {
     display: flex; align-items: center; justify-content: space-between; gap: 8px;
     background: var(--color-background); border: 1px solid var(--color-border);
@@ -118,20 +139,6 @@
 
   .icon { width: 16px; height: 16px; flex-shrink: 0; }
 
-  nav.menu { display: flex; gap: 4px; margin-bottom: 16px; }
-  nav.menu button.nav-item {
-    flex: 1; width: auto; margin-top: 0; min-height: 56px; padding: 8px 4px;
-    flex-direction: column; gap: 4px; font-size: 0.8rem; font-weight: 600;
-    background: var(--color-surface); color: var(--color-muted-foreground);
-    border: 1px solid var(--color-border); border-radius: 10px;
-  }
-  nav.menu button.nav-item .icon { width: 20px; height: 20px; }
-  nav.menu button.nav-item.active {
-    background: var(--color-primary); color: var(--color-on-primary); border-color: var(--color-primary);
-  }
-  nav.menu button.nav-item:hover { filter: none; border-color: var(--color-ring); }
-  nav.menu button.nav-item.active:hover { filter: brightness(0.94); }
-
   .dash-panel { display: none; }
   .dash-panel.active { display: block; }
 
@@ -220,25 +227,6 @@
   }
   .trust-pill .icon { width: 13px; height: 13px; color: var(--color-success); flex-shrink: 0; }
 
-  /* --- bento nav for the dashboard menu --- */
-  nav.menu.bento {
-    display: grid; grid-template-columns: 1fr 1fr; grid-template-areas: "deposit deposit" "bet withdraw";
-    gap: 8px;
-  }
-  nav.menu.bento button.nav-item {
-    width: 100%; align-items: flex-start; text-align: left; flex-direction: row; gap: 10px;
-    min-height: 64px; padding: 12px 14px; border-radius: 14px;
-  }
-  nav.menu.bento button#nav-deposit { grid-area: deposit; }
-  nav.menu.bento button#nav-bet { grid-area: bet; }
-  nav.menu.bento button#nav-withdraw { grid-area: withdraw; }
-  nav.menu.bento button.nav-item .icon { width: 20px; height: 20px; margin-top: 2px; }
-  nav.menu.bento button.nav-item .nav-item-text { display: flex; flex-direction: column; gap: 2px; }
-  nav.menu.bento button.nav-item .nav-item-title { font-size: 0.85rem; }
-  nav.menu.bento button.nav-item .nav-item-hint {
-    font-size: 0.7rem; font-weight: 400; color: inherit; opacity: 0.75;
-  }
-
   /* --- glowing card while a round is drawing --- */
   .card.drawing-glow {
     border-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-border));
@@ -284,6 +272,14 @@
   }
   .chain-block { color: var(--color-muted-foreground); white-space: nowrap; }
 
+  .maintenance-banner {
+    display: flex; align-items: flex-start; gap: 8px;
+    background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
+    border: 1px solid color-mix(in srgb, var(--color-primary) 40%, transparent);
+    color: var(--color-foreground); border-radius: var(--radius);
+    padding: 12px 14px; font-size: 0.82rem; line-height: 1.4; margin-bottom: 16px;
+  }
+
   @media (prefers-reduced-motion: reduce) {
     * { animation: none !important; transition: none !important; }
   }
@@ -291,6 +287,32 @@
 </head>
 <body>
 
+<nav class="app-navbar hidden" id="app-navbar" aria-label="Sezioni">
+  <div class="app-navbar-top">
+    <span class="brand">PLM Lottery</span>
+    <div class="app-navbar-account">
+      <span class="name" id="dash-username"></span>
+      <button class="link" onclick="logout()">Esci</button>
+    </div>
+  </div>
+  <div class="app-navbar-tabs">
+    <button class="navbar-tab active" id="nav-deposit" onclick="switchPanel('deposit')">
+      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="7" width="20" height="14" rx="2"/><path d="M16 21V5a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v16"/></svg>
+      Deposito
+    </button>
+    <button class="navbar-tab" id="nav-bet" onclick="switchPanel('bet')">
+      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="6" width="20" height="12" rx="2"/><path d="M6 12h.01M12 12h.01M18 12h.01"/></svg>
+      Bet
+    </button>
+    <button class="navbar-tab" id="nav-withdraw" onclick="switchPanel('withdraw')">
+      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 19V5M5 12l7-7 7 7"/></svg>
+      Prelievo
+    </button>
+  </div>
+</nav>
+
+<div class="app-shell">
+
 <div class="chain-bar" id="chain-bar">
   <span class="chain-status-pill">
     <span class="status-dot" id="chain-status-dot"></span>
@@ -299,6 +321,11 @@
   <span class="chain-block mono" id="chain-block">Blocco —</span>
 </div>
 
+<div class="maintenance-banner hidden" id="maintenance-banner">
+  <span>⚠️</span>
+  <span>Manutenzione in programma: il round in corso viene completato regolarmente (vincitore incluso), ma il round successivo non si aprirà finché la manutenzione non sarà terminata.</span>
+</div>
+
 <section id="landing-hero" class="hero">
   <h1>PLM Lottery</h1>
   <p class="lead">Deposita PLM, entra nel round con una quota fissa, e se viene estratto il tuo numero vinci il montepremi.</p>
@@ -355,13 +382,6 @@
 
 <section id="dashboard-section" class="hidden">
 
-  <div class="card">
-    <div class="account-bar">
-      <span class="name" id="dash-username"></span>
-      <button class="link" onclick="logout()">Esci</button>
-    </div>
-  </div>
-
   <div class="card" id="round-card">
     <div class="row-between" id="round-normal-row">
       <h2 id="round-title">Round —</h2>
@@ -386,21 +406,6 @@
     <div class="hidden" id="draw-result"></div>
   </div>
 
-  <nav class="menu bento" aria-label="Sezioni">
-    <button class="nav-item active" id="nav-deposit" onclick="switchPanel('deposit')">
-      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="7" width="20" height="14" rx="2"/><path d="M16 21V5a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v16"/></svg>
-      <span class="nav-item-text"><span class="nav-item-title">Deposito</span><span class="nav-item-hint">Indirizzo e saldo</span></span>
-    </button>
-    <button class="nav-item" id="nav-bet" onclick="switchPanel('bet')">
-      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="6" width="20" height="12" rx="2"/><path d="M6 12h.01M12 12h.01M18 12h.01"/></svg>
-      <span class="nav-item-text"><span class="nav-item-title">Bet</span><span class="nav-item-hint">Entra nel round</span></span>
-    </button>
-    <button class="nav-item" id="nav-withdraw" onclick="switchPanel('withdraw')">
-      <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 19V5M5 12l7-7 7 7"/></svg>
-      <span class="nav-item-text"><span class="nav-item-title">Prelievo</span><span class="nav-item-hint">Verso indirizzo esterno</span></span>
-    </button>
-  </nav>
-
   <div class="dash-panel active" id="panel-deposit">
     <div class="card">
       <h2>Saldo interno</h2>
@@ -451,6 +456,8 @@
 
 </section>
 
+</div>
+
 <div id="toast-container" aria-live="polite"></div>
 
 <script>
@@ -536,6 +543,8 @@ function updateChainStatusBar(data) {
   dot.className = 'status-dot status-' + statusKey;
   label.textContent = CHAIN_STATUS_LABELS[statusKey];
   block.textContent = 'Blocco ' + (data.chain_tip_height != null ? '#' + data.chain_tip_height : '—');
+
+  document.getElementById('maintenance-banner').classList.toggle('hidden', !data.lottery_paused);
 }
 
 let chainOnlyInterval = null;
@@ -669,6 +678,7 @@ function showDashboard() {
   stopChainOnlyPolling();
   document.getElementById('landing-hero').classList.add('hidden');
   document.getElementById('auth-section').classList.add('hidden');
+  document.getElementById('app-navbar').classList.remove('hidden');
   document.getElementById('dashboard-section').classList.remove('hidden');
   document.getElementById('dash-username').textContent = username;
   document.getElementById('dash-address').textContent = address;
@@ -732,6 +742,7 @@ function logout() {
   for (const key of Object.keys(drawStartedAt)) delete drawStartedAt[key];
   clearInterval(roundTimerInterval);
   clearTimeout(roundPollTimeout);
+  document.getElementById('app-navbar').classList.add('hidden');
   document.getElementById('dashboard-section').classList.add('hidden');
   document.getElementById('auth-section').classList.remove('hidden');
   document.getElementById('landing-hero').classList.remove('hidden');