feat: implement caching for group invite info and enhance message bubble layout for group invites

app/src/main/java/com/rosetta/messenger/data/GroupRepository.kt

@@ -16,6 +16,7 @@ import com.rosetta.messenger.network.PacketGroupLeave
 import com.rosetta.messenger.network.ProtocolManager
 import java.security.SecureRandom
 import java.util.UUID
+import java.util.concurrent.ConcurrentHashMap
 import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.withTimeoutOrNull
 import kotlin.coroutines.resume
@@ -27,6 +28,8 @@ class GroupRepository private constructor(context: Context) {
     private val messageDao = db.messageDao()
     private val dialogDao = db.dialogDao()
 
+    private val inviteInfoCache = ConcurrentHashMap<String, GroupInviteInfoResult>()
+
     companion object {
         private const val GROUP_PREFIX = "#group:"
         private const val GROUP_INVITE_PASSWORD = "rosetta_group"
@@ -159,6 +162,20 @@ class GroupRepository private constructor(context: Context) {
         return response.members
     }
 
+    fun getCachedInviteInfo(groupId: String): GroupInviteInfoResult? {
+        val normalized = normalizeGroupId(groupId)
+        return inviteInfoCache[normalized]
+    }
+
+    fun cacheInviteInfo(groupId: String, status: GroupStatus, membersCount: Int) {
+        val normalized = normalizeGroupId(groupId)
+        inviteInfoCache[normalized] = GroupInviteInfoResult(
+            groupId = normalized,
+            membersCount = membersCount,
+            status = status
+        )
+    }
+
     suspend fun requestInviteInfo(groupPublicKeyOrId: String): GroupInviteInfoResult? {
         val groupId = normalizeGroupId(groupPublicKeyOrId)
         if (groupId.isBlank()) return null
@@ -176,11 +193,13 @@ class GroupRepository private constructor(context: Context) {
         ) { incoming -> normalizeGroupId(incoming.groupId) == groupId }
             ?: return null
 
-        return GroupInviteInfoResult(
+        val result = GroupInviteInfoResult(
             groupId = groupId,
             membersCount = response.membersCount.coerceAtLeast(0),
             status = response.groupStatus
         )
+        inviteInfoCache[groupId] = result
+        return result
     }
 
     suspend fun createGroup(