feat: auto-publish key package on MarmotGroupListScreen entry

Replace the manual KeyPackage publish button with a LaunchedEffect
that auto-publishes if no key package exists yet. The subscription
already correctly downloads our own kind:30443 via
ownKeyPackageFilter() on home relays, and rotation is handled
reactively when Welcome messages are processed.

https://claude.ai/code/session_01LhfCp8DHqNVx6mSiYfpQny

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/chats/marmotGroup/MarmotGroupListScreen.kt

@@ -36,8 +36,6 @@ import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Add
-import androidx.compose.material.icons.filled.VpnKey
-import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.FloatingActionButton
 import androidx.compose.material3.HorizontalDivider
@@ -45,8 +43,6 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
-import androidx.compose.material3.SnackbarHost
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
@@ -54,12 +50,10 @@ 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.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
-import androidx.compose.ui.graphics.StrokeCap
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.style.TextOverflow
@@ -71,8 +65,6 @@ import com.vitorpamplona.amethyst.ui.navigation.navs.INav
 import com.vitorpamplona.amethyst.ui.navigation.routes.Route
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -81,10 +73,6 @@ fun MarmotGroupListScreen(
     nav: INav,
 ) {
     var groupList by remember { mutableStateOf(listOf<Pair<HexKey, MarmotGroupChatroom>>()) }
-    val scope = rememberCoroutineScope()
-    val snackbarHostState = remember { SnackbarHostState() }
-    var isPublishing by remember { mutableStateOf(false) }
-    var hasPublishedKeyPackage by remember { mutableStateOf(accountViewModel.hasPublishedKeyPackage()) }
 
     // Load group list
     LaunchedEffect(Unit) {
@@ -98,6 +86,17 @@ fun MarmotGroupListScreen(
         }
     }
 
+    // Auto-publish KeyPackage if none exists yet
+    LaunchedEffect(Unit) {
+        if (!accountViewModel.hasPublishedKeyPackage()) {
+            try {
+                accountViewModel.publishMarmotKeyPackage()
+            } catch (_: Exception) {
+                // Silently retry on next screen visit
+            }
+        }
+    }
+
     Scaffold(
         topBar = {
             TopAppBar(
@@ -110,47 +109,8 @@ fun MarmotGroupListScreen(
                     }
                 },
                 title = { Text("Marmot Groups") },
-                actions = {
-                    if (isPublishing) {
-                        CircularProgressIndicator(
-                            modifier = Modifier.padding(12.dp).size(24.dp),
-                            strokeWidth = 2.dp,
-                            strokeCap = StrokeCap.Round,
-                        )
-                    } else {
-                        IconButton(
-                            onClick = {
-                                isPublishing = true
-                                scope.launch(Dispatchers.IO) {
-                                    try {
-                                        accountViewModel.publishMarmotKeyPackage()
-                                        hasPublishedKeyPackage = true
-                                        snackbarHostState.showSnackbar("KeyPackage published successfully")
-                                    } catch (e: Exception) {
-                                        snackbarHostState.showSnackbar("Failed to publish KeyPackage: ${e.message}")
-                                    } finally {
-                                        isPublishing = false
-                                    }
-                                }
-                            },
-                        ) {
-                            Icon(
-                                imageVector = Icons.Default.VpnKey,
-                                contentDescription =
-                                    if (hasPublishedKeyPackage) "Republish KeyPackage" else "Publish KeyPackage",
-                                tint =
-                                    if (hasPublishedKeyPackage) {
-                                        MaterialTheme.colorScheme.primary
-                                    } else {
-                                        MaterialTheme.colorScheme.onSurfaceVariant
-                                    },
-                            )
-                        }
-                    }
-                },
             )
         },
-        snackbarHost = { SnackbarHost(snackbarHostState) },
         floatingActionButton = {
             FloatingActionButton(onClick = { nav.nav(Route.CreateMarmotGroup) }, shape = CircleShape) {
                 Icon(Icons.Default.Add, contentDescription = "Create Group")
@@ -168,12 +128,7 @@ fun MarmotGroupListScreen(
                         style = MaterialTheme.typography.titleMedium,
                     )
                     Text(
-                        text =
-                            if (hasPublishedKeyPackage) {
-                                "Your KeyPackage is published. Waiting for group invitations."
-                            } else {
-                                "Tap the key icon above to publish your KeyPackage and receive invitations."
-                            },
+                        text = "Create a group or wait for an invitation.",
                         style = MaterialTheme.typography.bodyMedium,
                         color = MaterialTheme.colorScheme.onSurfaceVariant,
                         modifier = Modifier.padding(top = 4.dp),