Stabilize staff concurrency and premium emoji; enable verified Drone deployment

src/utils/telegram_messages.py

@@ -0,0 +1,36 @@
+"""Copy user messages without losing Telegram entities, including custom emoji."""
+from aiogram.types import Message, MessageEntity
+
+
+def utf16_length(text: str) -> int:
+    """Telegram entity offsets count UTF-16 code units, not Python characters."""
+    return len(text.encode("utf-16-le")) // 2
+
+
+async def copy_preserving_entities(message: Message, recipient_id: int, sender_name: str | None = None):
+    if sender_name is None:
+        # Native copy keeps the original body/caption and its entities unchanged.
+        return await message.copy_to(recipient_id)
+
+    prefix = "📨 "
+    header = f"{prefix}{sender_name}:\n\n"
+    header_entities = [MessageEntity(type="bold", offset=utf16_length(prefix),
+                                     length=utf16_length(sender_name + ":"))]
+    offset = utf16_length(header)
+    has_caption = any((message.photo, message.video, message.document,
+                       message.animation, message.audio, message.voice))
+    body = message.text if message.text is not None else (message.caption or "")
+    original = message.entities if message.text is not None else message.caption_entities
+    entities = header_entities + [entity.model_copy(update={"offset": entity.offset + offset})
+                                  for entity in original or ()]
+    limit = 4096 if message.text is not None else 1024
+    if (message.text is not None or has_caption) and offset + utf16_length(body) <= limit:
+        if message.text is not None:
+            return await message.bot.send_message(recipient_id, header + body,
+                                                   entities=entities, parse_mode=None)
+        return await message.copy_to(recipient_id, caption=header + body,
+                                     caption_entities=entities, parse_mode=None)
+
+    # Do not trim a long body/caption: send the header separately and copy the original.
+    await message.bot.send_message(recipient_id, header, entities=header_entities, parse_mode=None)
+    return await message.copy_to(recipient_id)