Remove detect toggle button, keep model selector

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

src/components/Controls.svelte

@@ -5,7 +5,6 @@
   let expanded = $state(false);
   let tokenInput = $state("");
 
-  const handleDetect = () => vision.toggleDetect();
   const handleDepth = () => vision.toggleDepth();
   const handlePanoptic = () => vision.togglePanoptic();
   const handleFaceParse = () => vision.toggleFaceParse();
@@ -67,9 +66,6 @@
       {/if}
     {:else}
       <div class="btn-group">
-        <button class="btn btn-ai" class:active={vision.detectActive} onclick={handleDetect}>
-          {vision.detectActive ? 'Stop Detect' : 'Detect'}
-        </button>
         <select
           class="model-select"
           value={vision.detectorModelId}