build: S15 location preview

Co-Authored-By: Claude Opus 5.5 <[email protected]>

wetter/app/src/main/java/app/wetter/ui/screens/PreviewScreen.kt

@@ -0,0 +1,49 @@
+package app.wetter.ui.screens
+
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.rounded.ArrowBack
+import androidx.compose.material3.FilledTonalButton
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.res.stringResource
+import app.wetter.R
+import app.wetter.data.Forecast
+import app.wetter.data.Graph
+import app.wetter.data.Place
+import app.wetter.data.Settings
+import kotlinx.coroutines.launch
+
+/** S15: a searched place, shown in full before it is saved. */
+@Composable
+fun PreviewScreen(place: Place, settings: Settings, onBack: () -> Unit, onSaved: (Long) -> Unit) {
+    var forecast by remember { mutableStateOf<Forecast?>(null) }
+    var failed by remember { mutableStateOf(false) }
+    var attempt by remember { mutableStateOf(0) }
+    val scope = rememberCoroutineScope()
+    LaunchedEffect(place, attempt) {
+        failed = false
+        runCatching { Graph.repo.preview(place) }.onSuccess { forecast = it }.onFailure { failed = true }
+    }
+    ForecastPage(
+        title = place.name,
+        isCurrent = false,
+        forecast = forecast,
+        settings = settings,
+        animate = true,
+        refreshing = false,
+        failed = failed,
+        onRefresh = { attempt++ },
+        navigation = { IconButton(onClick = onBack) { Icon(Icons.AutoMirrored.Rounded.ArrowBack, stringResource(R.string.back)) } },
+        actions = {
+            FilledTonalButton(onClick = { scope.launch { onSaved(Graph.repo.save(place)) } }) { Text(stringResource(R.string.save)) }
+        },
+    )
+}