Description:

When the command agentSessions.toggleAgentSessionsSidebar (Chat Agent Sessions: Toggle Agent Sessions Sidebar) is used to show/hide the Agent Sessions panel, the Secondary Side Bar width resets to its default size on every toggle.

Steps to reproduce:

Resize the Secondary Side Bar to a custom width.
Run agentSessions.toggleAgentSessionsSidebar to hide the panel.
Run the command again to show it.
Observe: the Secondary Side Bar width is now back to default.
Expected behavior:
The Secondary Side Bar should preserve its last user-defined size across toggle operations, consistent with how the Primary Side Bar behaves.

Current behavior:
Size resets to default on every toggle.