Successfully created and wrote to new file: /home/Messier82/projects/service-book/app/src/main/java/com/servicebook/ui/components/PaywallInfoSheet.kt. Here is the updated code:
package com.servicebook.ui.components

import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.outlined.HourglassTop
import androidx.compose.material.icons.outlined.Lock
import androidx.compose.material3.Button
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.ModalBottomSheet
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.material3.rememberModalBottomSheetState
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.testTag
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import com.servicebook.R

/**
 * A modal bottom sheet that explains the paywall and offers an upgrade path.
 * This is the single source of upgrade routing.
 *
 * @param isPending Whether a purchase is currently pending.
 * @param onUpgradeClick Called when the user taps the primary upgrade button.
 * @param onDismissRequest Called when the sheet should be dismissed.
 */
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun PaywallInfoSheet(
    isPending: Boolean,
    onUpgradeClick: () -> Unit,
    onDismissRequest: () -> Unit,
) {
    val sheetState = rememberModalBottomSheetState()

    ModalBottomSheet(
        onDismissRequest = onDismissRequest,
        sheetState = sheetState,
        dragHandle = { androidx.compose.material3.BottomSheetDefaults.DragHandle() },
        modifier = Modifier.testTag("paywall-info-sheet"),
    ) {
        Column(
            modifier =
                Modifier
                    .fillMaxWidth()
                    .padding(24.dp)
                    .padding(bottom = 24.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            Icon(
                imageVector = if (isPending) Icons.Outlined.HourglassTop else Icons.Outlined.Lock,
                contentDescription = null,
                modifier = Modifier.size(32.dp),
                tint = MaterialTheme.colorScheme.primary,
            )
            Spacer(Modifier.height(16.dp))
            Text(
                text =
                    stringResource(
                        if (isPending) R.string.paywall_pending_headline else R.string.paywall_card_headline,
                    ),
                style = MaterialTheme.typography.headlineSmall,
                textAlign = TextAlign.Center,
            )
            Spacer(Modifier.height(12.dp))
            Text(
                text =
                    stringResource(
                        if (isPending) R.string.paywall_pending_body else R.string.paywall_sheet_body,
                    ),
                style = MaterialTheme.typography.bodyMedium,
                color = MaterialTheme.colorScheme.onSurfaceVariant,
                textAlign = TextAlign.Center,
            )
            Spacer(Modifier.height(32.dp))

            if (isPending) {
                Button(
                    onClick = onDismissRequest,
                    modifier = Modifier.fillMaxWidth(),
                ) {
                    Text(stringResource(R.string.action_ok))
                }
            } else {
                Button(
                    onClick = {
                        onDismissRequest()
                        onUpgradeClick()
                    },
                    modifier = Modifier.fillMaxWidth(),
                ) {
                    Text(stringResource(R.string.action_upgrade_premium))
                }
                Spacer(Modifier.height(8.dp))
                TextButton(
                    onClick = onDismissRequest,
                    modifier = Modifier.fillMaxWidth(),
                ) {
                    Text(stringResource(R.string.action_maybe_later))
                }
            }
        }
    }
}