Add command palette (Ctrl+K / Cmd+K) globally

Adds lt-cmd-overlay HTML to layout_header.php and initializes
lt.cmdPalette with commands for: navigation (Dashboard, New Ticket),
filters (My Tickets, Unassigned, P1 Critical), admin pages (if admin),
and recent tickets (last 5 viewed, stored in localStorage).

TicketView.php records each viewed ticket ID to localStorage under
lt_recent_tickets so the command palette can surface them as Recent.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

views/TicketView.php

@@ -120,6 +120,16 @@ window.ticketData = {
 };
 window.ticketData.id = window.ticketData.ticket_id;
 if (window.lt) lt.keys.initDefaults();
+// Track recently viewed tickets for command palette
+(function() {
+  try {
+    var tid = String(window.ticketData.ticket_id);
+    var key = 'lt_recent_tickets';
+    var r = JSON.parse(localStorage.getItem(key) || '[]');
+    r = [tid].concat(r.filter(function(x){ return x !== tid; })).slice(0, 5);
+    localStorage.setItem(key, JSON.stringify(r));
+  } catch(_) {}
+})();
 JS;
 
 include __DIR__ . '/layout_header.php';

views/layout_header.php

@@ -206,4 +206,60 @@ $_lt_assetVer  = $GLOBALS['config']['ASSET_VERSION'] ?? '20260329';
 
   </header><!-- /.lt-header -->
 
+  <!-- ── COMMAND PALETTE OVERLAY (Ctrl+K / ⌘K) ──────────────────── -->
+  <div id="lt-cmd-overlay" class="lt-cmd-overlay" role="dialog" aria-modal="true" aria-label="Command palette" aria-hidden="true">
+    <div id="lt-cmd-palette" class="lt-cmd-palette" role="combobox" aria-expanded="true" aria-haspopup="listbox">
+      <div class="lt-cmd-input-wrap">
+        <span aria-hidden="true" style="opacity:0.45;margin-right:0.4rem;font-size:0.9em">&#x2315;</span>
+        <input class="lt-cmd-input" type="text" placeholder="Type a command or search&hellip;"
+               autocomplete="off" spellcheck="false" aria-label="Command search" aria-autocomplete="list"
+               aria-controls="lt-cmd-results-list">
+        <kbd style="font-size:0.6rem;opacity:0.4;white-space:nowrap">ESC</kbd>
+      </div>
+      <div class="lt-cmd-results" id="lt-cmd-results-list" role="listbox"></div>
+    </div>
+  </div>
+  <script nonce="<?= htmlspecialchars($nonce, ENT_QUOTES, 'UTF-8') ?>">
+  (function() {
+    var isAdmin = <?= json_encode($_lt_isAdmin) ?>;
+    document.addEventListener('DOMContentLoaded', function() {
+      var commands = [
+        { id: 'nav-dashboard',  label: 'Dashboard',        icon: '⌂', group: 'Navigate', action: function(){ location.href = '/'; } },
+        { id: 'nav-new-ticket', label: 'New Ticket',        icon: '+', group: 'Navigate', kbd: 'N',  action: function(){ location.href = '/create'; } },
+        { id: 'filter-mine',    label: 'My Open Tickets',   icon: '◈', group: 'Filter',   action: function(){ location.href = '/?assigned_to=me&status=Open,In+Progress,Pending'; } },
+        { id: 'filter-unassigned', label: 'Unassigned Tickets', icon: '◌', group: 'Filter', action: function(){ location.href = '/?assigned_to=none'; } },
+        { id: 'filter-critical', label: 'P1 Critical Tickets', icon: '!', group: 'Filter', action: function(){ location.href = '/?priority=1'; } },
+      ];
+      if (isAdmin) {
+        [
+          { id: 'admin-templates',   label: 'Admin: Templates',     icon: '▤', href: '/admin/templates' },
+          { id: 'admin-workflow',    label: 'Admin: Workflow',       icon: '⇌', href: '/admin/workflow' },
+          { id: 'admin-audit',       label: 'Admin: Audit Log',      icon: '📋', href: '/admin/audit-log' },
+          { id: 'admin-api-keys',    label: 'Admin: API Keys',       icon: '🔑', href: '/admin/api-keys' },
+          { id: 'admin-users',       label: 'Admin: User Activity',  icon: '👤', href: '/admin/user-activity' },
+          { id: 'admin-recurring',   label: 'Admin: Recurring',      icon: '↻', href: '/admin/recurring-tickets' },
+          { id: 'admin-fields',      label: 'Admin: Custom Fields',  icon: '⊞', href: '/admin/custom-fields' },
+        ].forEach(function(c) {
+          commands.push({ id: c.id, label: c.label, icon: c.icon, group: 'Admin', action: function(href){ return function(){ location.href = href; }; }(c.href) });
+        });
+      }
+      // Inject recent ticket IDs from localStorage
+      try {
+        var recent = JSON.parse(localStorage.getItem('lt_recent_tickets') || '[]');
+        recent.slice(0, 5).forEach(function(id) {
+          commands.push({ id: 'recent-' + id, label: 'Ticket #' + id, icon: '◷', group: 'Recent', tags: ['ticket'], action: function(tid){ return function(){ location.href = '/ticket/' + tid; }; }(id) });
+        });
+      } catch(_) {}
+      if (window.lt && lt.cmdPalette) lt.cmdPalette.init(commands);
+    });
+    // Keyboard shortcut: Ctrl+K / Cmd+K
+    document.addEventListener('keydown', function(e) {
+      if ((e.ctrlKey || e.metaKey) && e.key === 'k') {
+        e.preventDefault();
+        if (window.lt && lt.cmdPalette) lt.cmdPalette.open();
+      }
+    });
+  })();
+  </script>
+
   <main class="lt-main lt-container" id="main-content" style="padding-top: calc(var(--header-height, 56px) + var(--space-lg, 1.5rem))">