fix(vision): hide flip camera button when only one camera available

Only show camera controls section when there's something to display:
- Flip button: only if multiple cameras
- Torch button: only if torch available
- Whole section: only if either button would be shown

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/src/components/vision/AbacusVisionBridge.tsx

@@ -415,8 +415,9 @@ export function AbacusVisionBridge({
         </button>
       </div>
 
-      {/* Camera controls (local camera) */}
-      {cameraSource === 'local' && vision.availableDevices.length > 0 && (
+      {/* Camera controls (local camera) - only show if there's something to display */}
+      {cameraSource === 'local' &&
+        (vision.availableDevices.length > 1 || vision.isTorchAvailable) && (
         <div
           data-element="camera-controls"
           className={css({
@@ -452,7 +453,8 @@ export function AbacusVisionBridge({
             </select>
           )}
 
-          {/* Flip camera button */}
+          {/* Flip camera button - only show if multiple cameras available */}
+          {vision.availableDevices.length > 1 && (
             <button
               type="button"
               onClick={() => vision.flipCamera()}
@@ -475,6 +477,7 @@ export function AbacusVisionBridge({
             >
               🔄
             </button>
+          )}
 
           {/* Torch toggle button (only if available) */}
           {vision.isTorchAvailable && (