admin/system: move status panel above tabs, add collapse toggle

Status (services, PHP env, disk) is now always visible above the log/config
tab bar rather than being one of the tab targets:

- Status section rendered unconditionally above <nav class="sys-tabs">.
- Services grid, PHP info grid and disk bar grouped inside a collapsible
  <section> with a header row containing the cache-freshness badge and a
  toggle button (▲ Réduire / ▼ Développer).
- Collapse state persisted in localStorage so the preference survives
  page reloads (e.g. when switching log tabs).
- Tab bar now only contains the three log tabs + nginx config; the 'Statut'
  tab is removed. Legacy ?tab=status URLs fall through to nginx_access.
- PHP/disk sub-sections laid out in a 2-col grid inside the status panel;
  responsive single-col below 700px.
- system.css: new .sys-status-section / .sys-status-header /
  .sys-status-toggle / .sys-status-meta rules added.
- aria-current="page" added to active tab links.
- todo/03-system-cache.md: all items marked done; notes added explaining
  why log caching was deliberately omitted.

public/admin/system.php

@@ -237,11 +237,12 @@ const ALLOWED_LINES = [50, 100, 200, 500];
 const NGINX_CONFIG_LIVE  = '/etc/nginx/sites-available/posterg';
 const NGINX_CONFIG_LOCAL = APP_ROOT . '/nginx/posterg.conf';
 
-// Active tab: 'status', 'nginx_config', or a log key
-$activeTab   = $_GET['tab'] ?? 'nginx_access';
-if ($activeTab === 'status' || $activeTab === 'nginx_config') {
-    // valid as-is
-} elseif (!array_key_exists($activeTab, LOG_FILES)) {
+// Active tab: 'nginx_config', or a log key (status is now always shown above tabs)
+$activeTab = $_GET['tab'] ?? 'nginx_access';
+if ($activeTab === 'status') {
+    // legacy URL — redirect to default log tab, status is always visible
+    $activeTab = 'nginx_access';
+} elseif ($activeTab !== 'nginx_config' && !array_key_exists($activeTab, LOG_FILES)) {
     $activeTab = 'nginx_access';
 }
 
@@ -293,7 +294,7 @@ $logLines    = null;
 $logError    = null;
 $logFileMeta = null;
 
-if ($activeTab !== 'status' && $activeTab !== 'nginx_config') {
+if ($activeTab !== 'nginx_config') {
     $logPath  = LOG_FILES[$activeTab]['path'];
     $logLines = readLogTail($logPath, $selectedN, $logError);
     if (file_exists($logPath)) {
@@ -361,6 +362,27 @@ $isAdmin = true; $bodyClass = 'admin-body';
 $extraCss = ['/assets/css/system.css'];
 $extraJsInline = <<<'JS'
 (function () {
+    // ── Status section toggle ──────────────────────────────────────────
+    var toggleBtn = document.getElementById('sys-status-toggle');
+    var statusBody = document.getElementById('sys-status-body');
+    if (toggleBtn && statusBody) {
+        toggleBtn.addEventListener('click', function () {
+            var collapsed = statusBody.hidden;
+            statusBody.hidden = !collapsed;
+            toggleBtn.setAttribute('aria-expanded', collapsed ? 'true' : 'false');
+            toggleBtn.textContent = collapsed ? '▲ Réduire' : '▼ Développer';
+            try { localStorage.setItem('sys_status_collapsed', collapsed ? '0' : '1'); } catch(e) {}
+        });
+        // Restore collapsed state
+        try {
+            if (localStorage.getItem('sys_status_collapsed') === '1') {
+                statusBody.hidden = true;
+                toggleBtn.setAttribute('aria-expanded', 'false');
+                toggleBtn.textContent = '▼ Développer';
+            }
+        } catch(e) {}
+    }
+
     // ── Instant tab switch on lines-select change ──────────────────────
     var sel = document.getElementById('lines-select');
     if (sel) {
@@ -425,76 +447,85 @@ require_once APP_ROOT . '/templates/head.php';
         <a href="?tab=<?= htmlspecialchars($activeTab) ?>&amp;n=<?= $selectedN ?>&amp;refresh=1">Forcer actualisation</a>
     </p>
 
+    <!-- ════════════════════════════════════════════════════════════════════
+         STATUS SECTION — always visible above tabs
+    ════════════════════════════════════════════════════════════════════ -->
+    <section class="sys-status-section" aria-label="Statut du système">
+        <div class="sys-status-header">
+            <h2 class="srv-section-title" style="margin:0;border:none;padding:0;">Statut
+                <?php if ($statusCached && $statusCacheAge !== null): ?>
+                <span class="sys-cache-badge sys-cache-badge--hit" title="Données en cache">
+                    ⚡ Cache — il y a <?= $statusCacheAge ?>s
+                </span>
+                <?php else: ?>
+                <span class="sys-cache-badge sys-cache-badge--miss" title="Données fraîches">
+                    ⟳ Actualisé
+                </span>
+                <?php endif; ?>
+            </h2>
+            <button id="sys-status-toggle" class="sys-status-toggle"
+                    aria-expanded="true" aria-controls="sys-status-body"
+                    type="button">▲ Réduire</button>
+        </div>
+
+        <div id="sys-status-body">
+            <div class="srv-grid">
+                <?php foreach ($checks as $check): ?>
+                <?php $st = $check['status'] ?? 'unknown'; ?>
+                <div class="srv-card">
+                    <div class="srv-card__header">
+                        <span class="srv-card__name"><?= htmlspecialchars($check['label']) ?></span>
+                        <span class="<?= statusClass($st) ?>"><?= statusLabel($st) ?></span>
+                    </div>
+                    <?php if (!empty($check['detail'])): ?>
+                    <div class="srv-card__detail"><?= htmlspecialchars($check['detail']) ?></div>
+                    <?php endif; ?>
+                </div>
+                <?php endforeach; ?>
+            </div>
+
+            <div class="sys-status-meta">
+                <div>
+                    <h3 class="srv-section-title" style="margin-bottom:.75rem;">Environnement PHP</h3>
+                    <div class="php-grid" style="margin-bottom:0;">
+                        <?php foreach ($phpInfo as $key => $val): ?>
+                        <div class="php-item">
+                            <div class="php-item__key"><?= htmlspecialchars($key) ?></div>
+                            <div class="php-item__val"><?= htmlspecialchars($val) ?></div>
+                        </div>
+                        <?php endforeach; ?>
+                    </div>
+                </div>
+                <div>
+                    <h3 class="srv-section-title" style="margin-bottom:.75rem;">Espace disque</h3>
+                    <?php $diskColor = $diskPct > 85 ? '#e05555' : ($diskPct > 70 ? '#ffc107' : '#4caf50'); ?>
+                    <div class="disk-bar-wrap">
+                        <div class="disk-bar" style="--disk-pct:<?= $diskPct ?>%;--disk-color:<?= $diskColor ?>"></div>
+                    </div>
+                    <div class="disk-stats">
+                        <span><?= humanBytes($diskUsed) ?> utilisé (<?= $diskPct ?>%)</span>
+                        <span><?= humanBytes($diskFree) ?> libre / <?= humanBytes($diskTotal) ?></span>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </section>
+
     <!-- ── Tab bar ─────────────────────────────────────────────────────── -->
-    <nav class="sys-tabs" aria-label="Sections système">
-        <a href="?tab=status"
-           class="sys-tab <?= $activeTab === 'status' ? 'active' : '' ?>">Statut</a>
+    <nav class="sys-tabs" aria-label="Journaux et configuration">
         <?php foreach (LOG_FILES as $key => $def): ?>
         <a href="?tab=<?= htmlspecialchars($key) ?>&amp;n=<?= $selectedN ?>"
-           class="sys-tab <?= $activeTab === $key ? 'active' : '' ?>">
+           class="sys-tab <?= $activeTab === $key ? 'active' : '' ?>"
+           <?= $activeTab === $key ? 'aria-current="page"' : '' ?>>
             <?= htmlspecialchars($def['label']) ?>
         </a>
         <?php endforeach; ?>
         <a href="?tab=nginx_config"
-           class="sys-tab <?= $activeTab === 'nginx_config' ? 'active' : '' ?>">nginx — config</a>
+           class="sys-tab <?= $activeTab === 'nginx_config' ? 'active' : '' ?>"
+           <?= $activeTab === 'nginx_config' ? 'aria-current="page"' : '' ?>>nginx — config</a>
     </nav>
 
-    <?php if ($activeTab === 'status'): ?>
-    <!-- ════════════════════════════════════════════════════════════════════
-         STATUS PANEL
-    ════════════════════════════════════════════════════════════════════ -->
-
-    <h2 class="srv-section-title">Services
-        <?php if ($statusCached && $statusCacheAge !== null): ?>
-        <span class="sys-cache-badge sys-cache-badge--hit" title="Données en cache">
-            ⚡ Cache — il y a <?= $statusCacheAge ?>s
-        </span>
-        <?php else: ?>
-        <span class="sys-cache-badge sys-cache-badge--miss" title="Données fraîches">
-            ⟳ Actualisé
-        </span>
-        <?php endif; ?>
-    </h2>
-    <div class="srv-grid">
-        <?php foreach ($checks as $check): ?>
-        <?php $st = $check['status'] ?? 'unknown'; ?>
-        <div class="srv-card">
-            <div class="srv-card__header">
-                <span class="srv-card__name"><?= htmlspecialchars($check['label']) ?></span>
-                <span class="<?= statusClass($st) ?>"><?= statusLabel($st) ?></span>
-            </div>
-            <?php if (!empty($check['detail'])): ?>
-            <div class="srv-card__detail"><?= htmlspecialchars($check['detail']) ?></div>
-            <?php endif; ?>
-        </div>
-        <?php endforeach; ?>
-    </div>
-
-    <h2 class="srv-section-title">Environnement PHP</h2>
-    <div class="php-grid">
-        <?php foreach ($phpInfo as $key => $val): ?>
-        <div class="php-item">
-            <div class="php-item__key"><?= htmlspecialchars($key) ?></div>
-            <div class="php-item__val"><?= htmlspecialchars($val) ?></div>
-        </div>
-        <?php endforeach; ?>
-    </div>
-
-    <h2 class="srv-section-title">Espace disque</h2>
-    <div style="max-width:420px;margin-bottom:2.5rem;">
-        <?php
-            $diskColor = $diskPct > 85 ? '#e05555' : ($diskPct > 70 ? '#ffc107' : '#4caf50');
-        ?>
-        <div class="disk-bar-wrap">
-            <div class="disk-bar" style="--disk-pct:<?= $diskPct ?>%;--disk-color:<?= $diskColor ?>"></div>
-        </div>
-        <div class="disk-stats">
-            <span><?= humanBytes($diskUsed) ?> utilisé (<?= $diskPct ?>%)</span>
-            <span><?= humanBytes($diskFree) ?> libre / <?= humanBytes($diskTotal) ?></span>
-        </div>
-    </div>
-
-    <?php elseif ($activeTab === 'nginx_config'): ?>
+    <?php if ($activeTab === 'nginx_config'): ?>
     <!-- ════════════════════════════════════════════════════════════════════
          NGINX CONFIG PANEL
     ════════════════════════════════════════════════════════════════════ -->

public/assets/css/system.css

@@ -30,6 +30,48 @@
     border-bottom-color: var(--accent-primary);
 }
 
+/* ── Status section (always-visible panel above tabs) ─────────────────── */
+.sys-status-section {
+    background: #1a1a1a;
+    border: 1px solid #555;
+    border-radius: 6px;
+    padding: 1rem 1.25rem 1.25rem;
+    margin-bottom: 1.75rem;
+}
+.sys-status-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    margin-bottom: 1rem;
+}
+.sys-status-toggle {
+    background: none;
+    border: 1px solid #555;
+    color: #969696;
+    border-radius: 3px;
+    font-size: .72rem;
+    font-family: inherit;
+    padding: .2rem .55rem;
+    cursor: pointer;
+    white-space: nowrap;
+    transition: color .15s, border-color .15s;
+}
+.sys-status-toggle:hover {
+    color: #e8e8e8;
+    border-color: #888;
+}
+.sys-status-meta {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 1.5rem 2rem;
+    margin-top: 1.5rem;
+    padding-top: 1.25rem;
+    border-top: 1px solid #333;
+}
+@media (max-width: 700px) {
+    .sys-status-meta { grid-template-columns: 1fr; }
+}
+
 /* ── Status cards ──────────────────────────────────────────────────────── */
 .srv-grid {
     display: grid;