Frontend: use a switch-camera icon for the Detector selection nav entry

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -11,7 +11,7 @@ import DashboardIcon from "@mui/icons-material/Dashboard";
 import ImageIcon from "@mui/icons-material/Image";
 import VideocamIcon from "@mui/icons-material/Videocam";
 import PhotoCameraIcon from "@mui/icons-material/PhotoCamera";
-import ChecklistIcon from "@mui/icons-material/Checklist";
+import SwitchCameraIcon from "@mui/icons-material/SwitchCamera";
 import GridOnIcon from "@mui/icons-material/GridOn";
 import BoltIcon from "@mui/icons-material/Bolt";
 import SaveIcon from "@mui/icons-material/Save";
@@ -168,7 +168,7 @@ function App() {
                     <DetectorSettings s={s.detector_settings}/>
                 </Stack>
             )},
-            { id: 'detector-selection', label: 'Detector selection', icon: <ChecklistIcon/>, render: () => (
+            { id: 'detector-selection', label: 'Detector selection', icon: <SwitchCameraIcon/>, render: () => (
                 <DetectorSelection s={s.detector_list}/>
             )},
             { id: 'masks', label: 'Masks', icon: <GridOnIcon/>, render: () => (