feat: improve rich chat notifications

- show image previews in photo notifications

- localize non-text notification bodies by message type

- use sender names as notification titles

app/notifications/service.py

@@ -4,6 +4,7 @@ import re
 from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.chats.repository import is_chat_muted_for_user, list_chat_members
+from app.media.repository import list_attachments_by_message_ids
 from app.messages.models import Message
 from app.notifications.repository import (
     create_notification_log,
@@ -29,6 +30,21 @@ def _extract_mentions(text: str | None) -> set[str]:
     return {match.group(1).lower() for match in _MENTION_RE.finditer(text)}
 
 
+def _message_preview_label(message: Message, image_preview_url: str | None) -> str:
+    text_preview = (message.text or "").strip()
+    if text_preview:
+        return text_preview[:120]
+    message_type = message.type.value if hasattr(message.type, "value") else str(message.type)
+    return {
+        "image": "Photo" if image_preview_url else "Image",
+        "video": "Video",
+        "audio": "Audio",
+        "voice": "Voice message",
+        "circle_video": "Video note",
+        "file": "File",
+    }.get(message_type, "Message")
+
+
 async def enqueue_notification(db: AsyncSession, payload: NotificationRequest) -> None:
     await create_notification_log(
         db,
@@ -51,18 +67,28 @@ async def dispatch_message_notifications(db: AsyncSession, message: Message) ->
 
     sender_users = await list_users_by_ids(db, [message.sender_id])
     sender_name = sender_users[0].username if sender_users else "Someone"
+    attachments = await list_attachments_by_message_ids(db, message_ids=[message.id])
+    first_attachment = attachments[0] if attachments else None
+    preview_image_url = None
+    if first_attachment and first_attachment.file_type.lower().startswith("image/"):
+        preview_image_url = first_attachment.file_url
+    preview_body = _message_preview_label(message, preview_image_url=preview_image_url)
+    message_type = message.type.value if hasattr(message.type, "value") else str(message.type)
 
     for recipient in users:
         base_payload = {
             "chat_id": message.chat_id,
             "message_id": message.id,
             "sender_id": message.sender_id,
+            "message_type": message_type,
+            "preview_image_url": preview_image_url or "",
+            "sender_name": sender_name,
         }
         if recipient.id in mentioned_user_ids:
             payload = {
                 **base_payload,
                 "type": "mention",
-                "text_preview": (message.text or "")[:120],
+                "text_preview": preview_body,
             }
             await create_notification_log(
                 db,
@@ -72,8 +98,8 @@ async def dispatch_message_notifications(db: AsyncSession, message: Message) ->
             )
             send_mention_notification_task.delay(
                 recipient.id,
-                f"{sender_name} mentioned you",
-                (message.text or "")[:120],
+                sender_name,
+                preview_body,
                 payload,
             )
             continue
@@ -84,7 +110,7 @@ async def dispatch_message_notifications(db: AsyncSession, message: Message) ->
         payload = {
             **base_payload,
             "type": "message",
-            "text_preview": (message.text or "")[:120],
+            "text_preview": preview_body,
         }
         await create_notification_log(
             db,
@@ -94,8 +120,8 @@ async def dispatch_message_notifications(db: AsyncSession, message: Message) ->
         )
         send_push_notification_task.delay(
             recipient.id,
-            f"New message from {sender_name}",
-            (message.text or "")[:120],
+            sender_name,
+            preview_body,
             payload,
         )