app navigator, tab navigator, session screen, minimal config on tabs & container

component/video/camera.tsx

@@ -3,6 +3,8 @@ import { StyleSheet, Text, View } from 'react-native'
 import { Camera, useCameraPermission, useCameraDevice, useCameraFormat, PhotoFile, VideoFile, CameraRuntimeError } from 'react-native-vision-camera'
 import { RecordingButton } from './capture-button'
 import { useIsForeground } from './is-foreground'
+import { useIsFocused } from '@react-navigation/native'
+
 
 export default function CameraScreen(): React.ReactElement {
   const camera = useRef<Camera>(null)
@@ -10,7 +12,8 @@ export default function CameraScreen(): React.ReactElement {
   const [isCameraInitialized, setIsCameraInitialized] = useState(false)
 
   const isForeground = useIsForeground()
-  const isActive = isForeground
+  const isFocused = useIsFocused();
+  const isActive = isForeground && isFocused
 
   const onError = useCallback((error: CameraRuntimeError) => {
     console.error(error)
@@ -65,7 +68,7 @@ export default function CameraScreen(): React.ReactElement {
           enabled={isCameraInitialized}
         />
       </View>
-      
+
     )
   )
 }