feat: enhance navigation behavior in MainApp and add log export functionality in LogsScreen

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/navigation/MainApp.kt

@@ -70,23 +70,33 @@ fun MainApp() {
                 NavigationBarItem(
                     selected = currentRoute == Routes.Tables || currentRoute?.startsWith("list/") == true,
                     onClick = {
+                        if (currentRoute?.startsWith("list/") == true) {
+                            // Behave like back from details to tables overview
+                            navController.popBackStack()
+                        } else {
                             navController.navigate(Routes.Tables) {
                                 popUpTo(navController.graph.findStartDestination().id) { saveState = true }
                                 launchSingleTop = true
                                 restoreState = true
                             }
+                        }
                     },
                     icon = { androidx.compose.material3.Icon(Icons.Default.Home, contentDescription = null) },
                     label = { Text("Tables") },
                 )
                 NavigationBarItem(
-                    selected = currentRoute == Routes.Settings,
+                    selected = currentRoute == Routes.Settings || currentRoute == Routes.Logs,
                     onClick = {
+                        if (currentRoute == Routes.Logs) {
+                            // Behave like back from logs to settings screen
+                            navController.popBackStack()
+                        } else {
                             navController.navigate(Routes.Settings) {
                                 popUpTo(navController.graph.findStartDestination().id) { saveState = true }
                                 launchSingleTop = true
                                 restoreState = true
                             }
+                        }
                     },
                     icon = { androidx.compose.material3.Icon(Icons.Default.Settings, contentDescription = null) },
                     label = { Text("Settings") },

CollabTableAndroid/app/src/main/java/com/collabtable/app/ui/screens/LogsScreen.kt

@@ -20,6 +20,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.Share
 import androidx.compose.material.icons.filled.FilterList
 import androidx.compose.material3.Badge
 import androidx.compose.material3.Button
@@ -54,6 +55,8 @@ import androidx.compose.ui.unit.sp
 import com.collabtable.app.utils.LogEntry
 import com.collabtable.app.utils.LogLevel
 import com.collabtable.app.utils.Logger
+import android.content.Intent
+import androidx.compose.ui.platform.LocalContext
 
 enum class TimeRange(val label: String, val milliseconds: Long) {
     LAST_10_SECONDS("Last 10 seconds", 10_000),
@@ -126,6 +129,20 @@ fun LogsScreen(onNavigateBack: () -> Unit) {
                     }
                 },
                 actions = {
+                    // Export logs via share intent
+                    val ctx = LocalContext.current
+                    IconButton(onClick = {
+                        val all = logs.joinToString(separator = "\n") { it.toFormattedString() }
+                        val sendIntent = Intent(Intent.ACTION_SEND).apply {
+                            type = "text/plain"
+                            putExtra(Intent.EXTRA_TEXT, all)
+                            putExtra(Intent.EXTRA_SUBJECT, "CollabTable Logs")
+                        }
+                        val chooser = Intent.createChooser(sendIntent, "Export logs")
+                        ctx.startActivity(chooser)
+                    }) {
+                        Icon(Icons.Default.Share, contentDescription = "Export logs")
+                    }
                     IconButton(onClick = { showFilterSheet = true }) {
                         Badge(
                             containerColor =
@@ -244,7 +261,7 @@ fun LogsScreen(onNavigateBack: () -> Unit) {
                     modifier =
                         Modifier
                             .fillMaxSize()
-                            .background(Color(0xFF1E1E1E)),
+                            .background(MaterialTheme.colorScheme.background),
                     contentPadding = PaddingValues(8.dp),
                 ) {
                     items(filteredLogs) { log ->