fix(sessions): correct session state categorization

- Backend now returns stopped and error sessions too
- Active sessions include running/building/pending
- Recent sessions show stopped/error only
- Status badge shows actual status (running/building/pending)

apps/api/src/api/tool_instances.py

@@ -827,7 +827,7 @@ async def get_user_sessions(
     result = await session.execute(
         select(ToolInstance)
         .where(ToolInstance.owner_id == user_id)
-        .where(ToolInstance.status.in_(["running", "building", "pending"]))
+        .where(ToolInstance.status.in_(["running", "building", "pending", "stopped", "error"]))
         .order_by(ToolInstance.created_at.desc())
     )
     instances = result.scalars().all()