fix(workout-builder): use navigation namespace for screen title translation

src/features/workout-builder/screens/BuilderScreen.tsx

@@ -13,6 +13,7 @@ const STROKES: StrokeType[] = ["Freestyle", "Backstroke", "Breaststroke", "Butte
 export function BuilderScreen() {
   const { t } = useTranslation("workout");
   const { t: tc } = useTranslation("common");
+  const { t: tb } = useTranslation("navigation");
   const navigation = useNavigation<NativeStackNavigationProp<RootStackParamList>>();
   const { poolLength: defaultPoolLength } = useSettings();
   const [poolLength, setPoolLength] = useState(defaultPoolLength);
@@ -47,7 +48,7 @@ export function BuilderScreen() {
     >
       <ScrollView className="flex-1 bg-white" contentContainerStyle={{ paddingBottom: 40 }}>
       <View className="p-4">
-        <Text className="text-2xl font-bold text-slate-900 mb-1">{t("buildWorkout")}</Text>
+        <Text className="text-2xl font-bold text-slate-900 mb-1">{tb("buildWorkout")}</Text>
         <Text className="text-slate-500 mb-4">
           {totalDistance}m total · {tc("pool", { length: poolLength })}
         </Text>