make Situation Simulator the first and default tab

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

index.html

@@ -538,13 +538,13 @@
   <!-- ── Main ── -->
   <main>
     <div class="tab-bar">
-      <button class="tab-btn active" onclick="showTab('stealth', this)">Stealth Actions</button>
+      <button class="tab-btn active" onclick="showTab('simulator', this)">Situation Simulator</button>
+      <button class="tab-btn" onclick="showTab('stealth', this)">Stealth Actions</button>
       <button class="tab-btn" onclick="showTab('detection', this)">Detection &amp; Targeting</button>
-      <button class="tab-btn" onclick="showTab('simulator', this)">Situation Simulator</button>
     </div>
 
     <!-- Stealth Tab -->
-    <div id="stealth" class="tab-panel active">
+    <div id="stealth" class="tab-panel">
       <h2>Stealth Actions Flow</h2>
       <p class="subtitle">From the <strong>stealther&rsquo;s</strong> perspective &mdash; how detection states change based on actions you take</p>
 
@@ -717,7 +717,7 @@ flowchart TD
     </div>
 
     <!-- Simulator Tab -->
-    <div id="simulator" class="tab-panel">
+    <div id="simulator" class="tab-panel active">
       <h2>Situation Simulator</h2>
       <p class="subtitle">Step through detection state changes interactively &mdash; choose an action to see what happens next</p>