swarm-ui: a swarm tab after agents holding the hives card and the beta notification router; /notifications redirects to it

frontend/packages/swarm-ui/src/shell/Shell.tsx

@@ -57,10 +57,10 @@ const SOLID_KEY = "swarm-ui:solid-backgrounds";
 
 const NAV_ITEMS: { href: string; label: string; accent: string }[] = [
   { href: "/agents", label: "agents", accent: "var(--green)" },
+  { href: "/swarm", label: "swarm", accent: "var(--yellow)" },
   { href: "/reports", label: "reports", accent: "var(--red)" },
   { href: "/jobs", label: "jobs", accent: "var(--pink)" },
   { href: "/messages", label: "messages", accent: "var(--purple)" },
-  { href: "/notifications", label: "notifications", accent: "var(--yellow)" },
   { href: "/components", label: "components", accent: "var(--blue)" },
 ];
 

frontend/packages/swarm-ui/src/shell/routes.ts

@@ -38,6 +38,7 @@ export const MOVED_ROUTES: Readonly<Record<string, string>> = {
   "/builds": "/jobs",
   "/review": "/jobs",
   "/schedules": "/messages",
+  "/notifications": "/swarm",
 };
 
 /** Where an old address goes, keeping its query; `null` for any other path. */