Rework ChatJoinRequestQueryResult + EditChatMessageText nullable text

- ChatJoinRequestQueryResult: enum -> sealed interface (Approve/Decline/
  Queue objects + Unknown) with a companion KSerializer using a
  PrimitiveKind.STRING descriptor (encodeString/decodeString), not
  String.serializer()
- EditChatMessageText: text is now nullable per API; add EditChatMessageRichText
  factory for rich edits; widen EditTextChatMessage.text to String?

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/chat/invite_links/AnswerChatJoinRequestQuery.kt

@@ -6,34 +6,68 @@ import dev.inmo.tgbotapi.types.chatJoinRequestQueryIdField
 import dev.inmo.tgbotapi.types.resultField
 import dev.inmo.tgbotapi.utils.serializers.UnitFromBooleanSerializer
 import kotlinx.serialization.DeserializationStrategy
+import kotlinx.serialization.KSerializer
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.SerializationStrategy
+import kotlinx.serialization.descriptors.PrimitiveKind
+import kotlinx.serialization.descriptors.PrimitiveSerialDescriptor
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
 
 /**
- * Result of an [AnswerChatJoinRequestQuery].
+ * Result of an [AnswerChatJoinRequestQuery]. Serialized as a plain string.
  *
  * @see <a href="https://core.telegram.org/bots/api#answerchatjoinrequestquery">answerChatJoinRequestQuery</a>
  */
-@Serializable
-enum class ChatJoinRequestQueryResult {
+@Serializable(ChatJoinRequestQueryResult.Companion::class)
+sealed interface ChatJoinRequestQueryResult {
+    val name: String
+
     /**
      * Allow the user to join the chat.
      */
-    @SerialName("approve")
-    Approve,
+    object Approve : ChatJoinRequestQueryResult {
+        override val name: String = "approve"
+    }
 
     /**
      * Disallow the user to join the chat.
      */
-    @SerialName("decline")
-    Decline,
+    object Decline : ChatJoinRequestQueryResult {
+        override val name: String = "decline"
+    }
 
     /**
      * Leave the decision to other administrators.
      */
-    @SerialName("queue")
-    Queue
+    object Queue : ChatJoinRequestQueryResult {
+        override val name: String = "queue"
+    }
+
+    /**
+     * Any other result which is currently unknown to this library.
+     */
+    data class Unknown(override val name: String) : ChatJoinRequestQueryResult
+
+    companion object : KSerializer<ChatJoinRequestQueryResult> {
+        override val descriptor: SerialDescriptor =
+            PrimitiveSerialDescriptor("dev.inmo.tgbotapi.requests.chat.invite_links.ChatJoinRequestQueryResult", PrimitiveKind.STRING)
+
+        override fun serialize(encoder: Encoder, value: ChatJoinRequestQueryResult) {
+            encoder.encodeString(value.name)
+        }
+
+        override fun deserialize(decoder: Decoder): ChatJoinRequestQueryResult {
+            return when (val name = decoder.decodeString()) {
+                Approve.name -> Approve
+                Decline.name -> Decline
+                Queue.name -> Queue
+                else -> Unknown(name)
+            }
+        }
+    }
 }
 
 /**

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/edit/abstracts/EditTextChatMessage.kt

@@ -3,5 +3,5 @@ package dev.inmo.tgbotapi.requests.edit.abstracts
 import dev.inmo.tgbotapi.abstracts.TextedOutput
 
 interface EditTextChatMessage : TextedOutput {
-    override val text: String
+    override val text: String?
 }

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/edit/text/EditChatMessageText.kt

@@ -56,6 +56,24 @@ fun EditChatMessageText(
     replyMarkup
 )
 
+fun EditChatMessageRichText(
+    chatId: ChatIdentifier,
+    messageId: MessageId,
+    richMessage: InputRichMessage,
+    businessConnectionId: BusinessConnectionId? = chatId.businessConnectionId,
+    replyMarkup: InlineKeyboardMarkup? = null
+) = EditChatMessageText(
+    chatId = chatId,
+    messageId = messageId,
+    text = null,
+    parseMode = null,
+    rawEntities = null,
+    businessConnectionId = businessConnectionId,
+    linkPreviewOptions = null,
+    replyMarkup = replyMarkup,
+    richMessage = richMessage
+)
+
 @ConsistentCopyVisibility
 @Serializable
 data class EditChatMessageText internal constructor(
@@ -64,7 +82,7 @@ data class EditChatMessageText internal constructor(
     @SerialName(messageIdField)
     override val messageId: MessageId,
     @SerialName(textField)
-    override val text: String,
+    override val text: String? = null,
     @SerialName(parseModeField)
     override val parseMode: ParseMode? = null,
     @SerialName(entitiesField)
@@ -79,7 +97,7 @@ data class EditChatMessageText internal constructor(
     val richMessage: InputRichMessage? = null
 ) : EditChatMessage<TextContent>, EditTextChatMessage, EditReplyMessage, EditLinkPreviewOptionsContainer {
     override val textSources: TextSourcesList? by lazy {
-        rawEntities ?.asTextSources(text)
+        text ?.let { rawEntities ?.asTextSources(it) }
     }
 
     override fun method(): String = editMessageTextMethod