fix: system messages go to project chat (visible in ChatPanel)

src/tracker/api/tasks.py

@@ -10,7 +10,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload, joinedload
 
 from tracker.database import get_db
-from tracker.models import Task, Step, Project, Member, Message
+from tracker.models import Task, Step, Project, Member, Message, Chat
 
 router = APIRouter(tags=["tasks"])
 
@@ -81,9 +81,24 @@ class AssignRequest(BaseModel):
 # --- Helpers ---
 
 async def _system_message(db: AsyncSession, task: Task, content: str, project_slug: str = ""):
-    """Create a system message for a task and broadcast it via WS."""
+    """Create a system message for a task and broadcast it via WS.
+    
+    Message goes to the project chat (visible in ChatPanel) with task_id reference.
+    """
     from tracker.ws.manager import manager
+
+    # Find project chat
+    chat_id = None
+    if task.project_id:
+        result = await db.execute(
+            select(Chat).where(Chat.project_id == task.project_id, Chat.kind == "project")
+        )
+        chat = result.scalar_one_or_none()
+        if chat:
+            chat_id = chat.id
+
     msg = Message(
+        chat_id=chat_id,
         task_id=task.id,
         author_type="system",
         author_slug="system",
@@ -96,15 +111,17 @@ async def _system_message(db: AsyncSession, task: Task, content: str, project_sl
     prefix = project_slug[:2].upper() if project_slug else "XX"
     key = f"{prefix}-{task.number}"
 
-    await manager.broadcast_task_event(str(task.project_id), "message.new", {
+    event_data = {
         "id": str(msg.id),
+        "chat_id": str(chat_id) if chat_id else None,
         "task_id": str(task.id),
         "task_key": key,
         "author_type": "system",
         "author_slug": "system",
         "content": content,
         "created_at": msg.created_at.isoformat() if msg.created_at else "",
-    })
+    }
+    await manager.broadcast_task_event(str(task.project_id), "message.new", event_data)
 
 
 def _task_out(t: Task, project_slug: str = "") -> dict: