Move GPU Duration to top of Advanced Settings

GPU Duration is adjusted more frequently than seed, so it belongs at the top for easier access.

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

templates/app.html

@@ -114,6 +114,11 @@
             <div class="settings-group">
                 <div class="settings-group-title">Advanced Settings</div>
                 <div class="settings-group-body">
+                    <div class="slider-row">
+                        <label>GPU Duration (s)</label>
+                        <input type="range" id="custom-gpu-duration" min="10" max="120" step="5" value="20">
+                        <span class="slider-val" id="custom-gpu-duration-val">20</span>
+                    </div>
                     <div class="slider-row">
                         <label>Seed</label>
                         <input type="range" id="custom-seed" min="0" max="2147483647" step="1" value="0">
@@ -133,11 +138,6 @@
                         <input type="range" id="custom-steps" min="1" max="50" step="1" value="4">
                         <span class="slider-val" id="custom-steps-val">4</span>
                     </div>
-                    <div class="slider-row">
-                        <label>GPU Duration (s)</label>
-                        <input type="range" id="custom-gpu-duration" min="10" max="120" step="5" value="20">
-                        <span class="slider-val" id="custom-gpu-duration-val">20</span>
-                    </div>
                 </div>
             </div>
         </div>