feat(api)!: widen rich draft chat identifier

BREAKING CHANGE: SendRichMessageDraft, sendRichMessageDraft, and the rich-draft send overload now accept IdChatIdentifier. Existing ChatId source calls remain valid; JVM signatures changed.

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/requests/send/SendRichMessageDraft.kt

@@ -1,7 +1,7 @@
 package dev.inmo.tgbotapi.requests.send
 
 import dev.inmo.tgbotapi.requests.abstracts.SimpleRequest
-import dev.inmo.tgbotapi.types.ChatId
+import dev.inmo.tgbotapi.types.IdChatIdentifier
 import dev.inmo.tgbotapi.types.MessageThreadId
 import dev.inmo.tgbotapi.types.canStopField
 import dev.inmo.tgbotapi.types.chatIdField
@@ -22,12 +22,13 @@ import kotlinx.serialization.SerializationStrategy
  * ephemeral and acts as a temporary 30-second preview - once the output is finalized, [SendRichMessage] must be called
  * with the complete message to persist it in the user's chat.
  *
+ * @param chatId Numeric target chat identifier. Identifiers carrying a thread supply the default [threadId].
  * @see <a href="https://core.telegram.org/bots/api#sendrichmessagedraft">sendRichMessageDraft</a>
  */
 @Serializable
 data class SendRichMessageDraft(
     @SerialName(chatIdField)
-    val chatId: ChatId,
+    val chatId: IdChatIdentifier,
     /**
      * Unique identifier of the message draft; must be non-zero. Changes to drafts with the same identifier are animated.
      */

tgbotapi.core/src/commonTest/kotlin/dev/inmo/tgbotapi/types/GeneralBotApi103Test.kt

@@ -37,6 +37,18 @@ class GeneralBotApi103Test {
         assertEquals("true", richDraftJson[keepOnStopField].toString())
     }
 
+    @Test
+    fun `rich draft accepts thread-bearing chat identifiers`() {
+        val chatId = ChatIdWithThreadId(RawChatId(3L), MessageThreadId(4L))
+        val richDraft = SendRichMessageDraft(chatId, 5L, InputRichMessageHTML("draft"))
+        val richDraftJson = json.encodeToJsonElement(SendRichMessageDraft.serializer(), richDraft).jsonObject
+
+        assertEquals(chatId, richDraft.chatId)
+        assertEquals(MessageThreadId(4L), richDraft.threadId)
+        assertEquals("3", richDraftJson[chatIdField].toString())
+        assertEquals("4", richDraftJson[messageThreadIdField].toString())
+    }
+
     @Test
     fun `stopped message generation update deserializes`() {
         val update = nonstrictJsonFormat.decodeFromString(