Preserve any agent tab when switching agents in sidebar

Remove hardcoded validTabs set and pass through whatever tab
segment is in the current URL. This makes tab preservation
work for all current and future agent tabs.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/components/SidebarAgents.tsx

@@ -78,8 +78,6 @@ export function SidebarAgents() {
   const activeAgentId = agentMatch?.[1] ?? null;
   const activeTab = agentMatch?.[2] ?? null;
 
-  // Valid agent detail tabs — preserve across agent switches
-  const validTabs = new Set(["dashboard", "instructions", "prompts", "skills", "configuration", "configure", "budget", "runs"]);
 
   return (
     <Collapsible open={open} onOpenChange={setOpen}>
@@ -116,7 +114,7 @@ export function SidebarAgents() {
             return (
               <NavLink
                 key={agent.id}
-                to={activeTab && validTabs.has(activeTab) ? `${agentUrl(agent)}/${activeTab}` : agentUrl(agent)}
+                to={activeTab ? `${agentUrl(agent)}/${activeTab}` : agentUrl(agent)}
                 onClick={() => {
                   if (isMobile) setSidebarOpen(false);
                 }}