feat: enhance agent management with session handling and UI improvements

backend/app/api/activity.py

@@ -4,8 +4,7 @@ from fastapi import APIRouter, Depends, Query
 from sqlalchemy import desc
 from sqlmodel import Session, col, select
 
-from app.api.deps import require_admin_auth
-from app.core.auth import AuthContext
+from app.api.deps import ActorContext, require_admin_or_agent
 from app.db.session import get_session
 from app.models.activity_events import ActivityEvent
 from app.schemas.activity_events import ActivityEventRead
@@ -18,11 +17,13 @@ def list_activity(
     limit: int = Query(50, ge=1, le=200),
     offset: int = Query(0, ge=0),
     session: Session = Depends(get_session),
-    auth: AuthContext = Depends(require_admin_auth),
+    actor: ActorContext = Depends(require_admin_or_agent),
 ) -> list[ActivityEvent]:
+    statement = select(ActivityEvent)
+    if actor.actor_type == "agent" and actor.agent:
+        statement = statement.where(ActivityEvent.agent_id == actor.agent.id)
     statement = (
-        select(ActivityEvent)
-        .order_by(desc(col(ActivityEvent.created_at)))
+        statement.order_by(desc(col(ActivityEvent.created_at)))
         .offset(offset)
         .limit(limit)
     )