feat(web-ui): improve navigation and session UX

cmd/web-ui/static/index.html

@@ -4,6 +4,7 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>agentmon</title>
+  <link rel="icon" type="image/svg+xml" href="/favicon.svg">
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&family=Outfit:wght@300;400;500;600&family=Fira+Code:wght@400;500&display=swap" rel="stylesheet">
@@ -16,11 +17,14 @@
     <div class="header-logo">
       <h1><a href="/">agentmon<span class="logo-dot"></span></a></h1>
     </div>
-    <nav><a href="/">Dashboard</a><a href="/sessions">Sessions</a><a href="/agents">Agents</a><a href="/infrastructure">Infra</a></nav>
+    <nav><a href="/">Dashboard<span class="nav-badge" id="nav-error-badge"></span></a><a href="/sessions">Sessions</a><a href="/agents">Agents</a><a href="/infrastructure">Infra</a></nav>
     <div class="header-right">
       <div class="header-search">
         <input type="text" id="global-search" placeholder="Search ID..." spellcheck="false" autocomplete="off">
         <kbd>/</kbd>
+        <button class="cmd-k-hint" id="cmd-k-hint" title="Command palette" type="button">
+          <kbd>⌘K</kbd>
+        </button>
       </div>
       <span class="ws-dot" id="ws-dot" title="Disconnected"></span>
       <button class="theme-toggle" id="theme-toggle" aria-label="Toggle theme"></button>