fix: preserve tab on back and avoid nav bar overlap (0.4.5)

Keep the selected bottom tab when returning from host/event detail screens.
Add navigation bar padding on scrollable detail screens.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/build.gradle.kts

@@ -13,8 +13,8 @@ android {
         applicationId = "ru.kalinamall.seaca"
         minSdk = 26
         targetSdk = 35
-        versionCode = 7
-        versionName = "0.4.3"
+        versionCode = 9
+        versionName = "0.4.5"
     }
 
     buildTypes {

app/src/main/java/ru/kalinamall/seaca/MainActivity.kt

@@ -28,6 +28,8 @@ import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.mutableStateOf as composeMutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -162,6 +164,8 @@ private fun SeacaApp(
         val role = repo.session.getRole()
         role == "operator" || role == "admin"
     }
+    var mainTabIndex by rememberSaveable { mutableIntStateOf(MainTab.Dashboard.ordinal) }
+    val mainTab = MainTab.entries[mainTabIndex.coerceIn(MainTab.entries.indices)]
 
     SeacaTheme {
         if (!loggedIn) {
@@ -183,6 +187,8 @@ private fun SeacaApp(
             composable("main") {
                 MainShell(
                     repo = repo,
+                    selectedTab = mainTab,
+                    onTabSelected = { mainTabIndex = it.ordinal },
                     onOpenEvent = { nav.navigate("event/$it") },
                     onOpenProblem = { nav.navigate("problem/$it") },
                     onOpenHost = { nav.navigate("host/$it") },
@@ -231,20 +237,20 @@ private enum class MainTab(val label: String) {
 @Composable
 private fun MainShell(
     repo: SacRepository,
+    selectedTab: MainTab,
+    onTabSelected: (MainTab) -> Unit,
     onOpenEvent: (Long) -> Unit,
     onOpenProblem: (Long) -> Unit,
     onOpenHost: (Long) -> Unit,
     onOpenDevice: () -> Unit,
 ) {
-    var tab by remember { mutableStateOf(MainTab.Dashboard) }
-
     Scaffold(
         bottomBar = {
             NavigationBar {
                 MainTab.entries.forEach { item ->
                     NavigationBarItem(
-                        selected = tab == item,
-                        onClick = { tab = item },
+                        selected = selectedTab == item,
+                        onClick = { onTabSelected(item) },
                         icon = {
                             Icon(
                                 when (item) {
@@ -270,7 +276,7 @@ private fun MainShell(
         },
     ) { padding ->
         Box(Modifier.padding(padding)) {
-            when (tab) {
+            when (selectedTab) {
                 MainTab.Dashboard -> DashboardScreen(repo)
                 MainTab.Events -> EventsScreen(repo, onOpenEvent)
                 MainTab.Problems -> ProblemsScreen(repo, onOpenProblem)

app/src/main/java/ru/kalinamall/seaca/ui/screens/DetailScreens.kt

@@ -5,6 +5,7 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
@@ -215,7 +216,8 @@ fun DeviceScreen(repo: SacRepository, onLogout: () -> Unit) {
         Modifier
             .fillMaxSize()
             .verticalScroll(rememberScrollState())
-            .padding(16.dp),
+            .padding(16.dp)
+            .navigationBarsPadding(),
         verticalArrangement = Arrangement.spacedBy(8.dp),
     ) {
         Text("Моё устройство", style = MaterialTheme.typography.titleLarge)
@@ -275,7 +277,8 @@ private fun DetailFrame(
         Modifier
             .fillMaxSize()
             .verticalScroll(rememberScrollState())
-            .padding(16.dp),
+            .padding(16.dp)
+            .navigationBarsPadding(),
         verticalArrangement = Arrangement.spacedBy(8.dp),
     ) {
         Button(onClick = onBack) { Text("Назад") }