feat(group-chat): add ephemeral visual pass indicator when bot passes turn

- Display a subtle centered system pill '[⏩ {bot} passed]' when a bot passes
- Style with Material icon (Icons.Filled.FastForward) and surface tokens
- Keep pass indicators strictly ephemeral to avoid polluting LLM prompt context
- Exclude from cross-device snapshot sync so it disappears on restart/rehydrate
- Add English and Arabic localized string resources
- Update GroupChatViewModelTest to verify pass indicator presence and LLM filtering

Co-authored-by: Luna <luna.m57@agentmail.to>

app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatModels.kt

@@ -32,9 +32,13 @@ data class GroupChatMessage(
     val isStreaming: Boolean = false,
     val thread: String? = null,
     val isSystem: Boolean = false,
+    val isPass: Boolean = false,
     val toolCalls: List<GroupChatToolCall> = emptyList(),
 )
 
+const val STOPPED_SYSTEM_TEXT = "Discussion stopped"
+const val CAPPED_SYSTEM_TEXT = "Discussion paused (turn limit reached) — reply to continue"
+
 /**
  * Pure helper for mention extraction and responder resolution matching Desktop parity.
  */

app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatScreen.kt

@@ -40,6 +40,7 @@ import androidx.compose.material.icons.filled.ContentCopy
 import androidx.compose.material.icons.filled.Description
 import androidx.compose.material.icons.filled.ExpandLess
 import androidx.compose.material.icons.filled.ExpandMore
+import androidx.compose.material.icons.filled.FastForward
 import androidx.compose.material.icons.filled.Groups
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material.icons.filled.Settings
@@ -845,21 +846,53 @@ private fun GroupMessageCard(
     }
 
     if (message.isSystem) {
+        val displayText =
+            when {
+                message.isPass -> {
+                    val name = message.senderDisplayName.ifBlank { message.senderName }
+                    stringResource(R.string.group_chat_bot_passed, name)
+                }
+
+                message.text == STOPPED_SYSTEM_TEXT -> {
+                    stringResource(R.string.group_chat_stopped_by_user)
+                }
+
+                message.text == CAPPED_SYSTEM_TEXT -> {
+                    stringResource(R.string.group_chat_capped_limit)
+                }
+
+                else -> {
+                    message.text
+                }
+            }
         Box(
             modifier = modifier.fillMaxWidth().padding(vertical = 4.dp),
             contentAlignment = Alignment.Center,
         ) {
             Surface(
                 shape = RoundedCornerShape(12.dp),
-                color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = 0.6f),
-                border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.5f)),
+                color = MaterialTheme.colorScheme.surfaceVariant.copy(alpha = if (message.isPass) 0.5f else 0.6f),
+                border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.4f)),
             ) {
-                Text(
-                    text = message.text,
-                    style = MaterialTheme.typography.labelSmall,
-                    color = MaterialTheme.colorScheme.onSurfaceVariant,
-                    modifier = Modifier.padding(horizontal = 12.dp, vertical = 6.dp),
-                )
+                Row(
+                    modifier = Modifier.padding(horizontal = 10.dp, vertical = 4.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(4.dp),
+                ) {
+                    if (message.isPass) {
+                        Icon(
+                            imageVector = Icons.Filled.FastForward,
+                            contentDescription = null,
+                            modifier = Modifier.size(12.dp),
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.7f),
+                        )
+                    }
+                    Text(
+                        text = displayText,
+                        style = MaterialTheme.typography.labelSmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                    )
+                }
             }
         }
     } else if (message.isUser) {

app/src/main/java/com/m57/hermescontrol/ui/bots/group/GroupChatViewModel.kt

@@ -59,8 +59,6 @@ const val WARN_MAX_CONTINUATION_PASSES = 6
 private const val LEASE_STEP_TTL_MS = 45_000L
 private const val TURN_TIMEOUT_MS = 45_000L
 private const val HISTORY_LIMIT = 10
-private const val CAPPED_SYSTEM_TEXT = "Discussion paused (turn limit reached) — reply to continue"
-private const val STOPPED_SYSTEM_TEXT = "Discussion stopped"
 
 class GroupChatViewModel(
     private var groupName: String = "",
@@ -791,6 +789,28 @@ class GroupChatViewModel(
                     state.copy(messages = updatedList)
                 }
                 return replyText.trim()
+            } else if (replyText != null && isPass(replyText)) {
+                _uiState.update { state ->
+                    val existing = state.messages.find { it.id == streamMsgId }
+                    val passMsg =
+                        GroupChatMessage(
+                            id = streamMsgId,
+                            senderName = bot.name,
+                            senderDisplayName = bot.effectiveTitle,
+                            isUser = false,
+                            isSystem = true,
+                            isPass = true,
+                            text = "${bot.effectiveTitle} passed",
+                        )
+                    val updatedList =
+                        if (existing != null) {
+                            state.messages.map { if (it.id == streamMsgId) passMsg else it }
+                        } else {
+                            state.messages + passMsg
+                        }
+                    state.copy(messages = updatedList)
+                }
+                return null
             } else {
                 _uiState.update { state ->
                     state.copy(messages = state.messages.filter { it.id != streamMsgId })