refactor: Migrate GuidedTourScreen to androidx.compose.foundation.pager

Migrated the GuidedTourScreen from deprecated Accompanist Pager to androidx.compose.foundation.pager.
Removed HorizontalPagerIndicator usage, as a direct replacement is not available and requires custom implementation.

app/src/main/java/de/lxtools/noteshop/ui/GuidedTourScreen.kt

@@ -19,10 +19,10 @@ import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
-import com.google.accompanist.pager.HorizontalPager
-import com.google.accompanist.pager.HorizontalPagerIndicator
-import com.google.accompanist.pager.rememberPagerState
-import de.lxtools.noteshop.R
+
+
+import androidx.compose.foundation.pager.rememberPagerState
+import androidx.compose.foundation.pager.HorizontalPager
 
 @Composable
 fun GuidedTourScreen(onTourFinished: () -> Unit) {
@@ -57,12 +57,8 @@ fun GuidedTourScreen(onTourFinished: () -> Unit) {
             }
         }
 
-        HorizontalPagerIndicator(
-            pagerState = pagerState,
-            modifier = Modifier
-                .align(Alignment.CenterHorizontally)
-                .padding(16.dp)
-        )
+// TODO: Implement a custom HorizontalPagerIndicator or use a third-party library
+
 
         Button(
             onClick = onTourFinished,