swarm-ui: the moved tabs' redirects come from one table, with tests

The four tab moves each hand-wrote a redirect route. They are one table now,
MOVED_ROUTES, and movedHref says where an old address goes with its query
kept; /builds?run= still lands on the build's card. The builds page's own
redirect helper is gone.

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

@@ -27,3 +27,22 @@ export function visibleNavItems<T extends { href: string }>(
   if (!hideDeveloper) return items;
   return items.filter((item) => !DEVELOPER_ROUTES.includes(item.href));
 }
+
+// Tabs that were folded into another one. Each old address redirects to its
+// new tab, so a bookmark or a link made before the move still lands. The
+// builds page's `?run=` query rides along, which a swarm-builder commit
+// status link relies on.
+export const MOVED_ROUTES: Readonly<Record<string, string>> = {
+  "/alerts": "/reports",
+  "/issues": "/reports",
+  "/builds": "/jobs",
+  "/review": "/jobs",
+  "/schedules": "/messages",
+};
+
+/** Where an old address goes, keeping its query; `null` for any other path. */
+export function movedHref(path: string, search: string): string | null {
+  const to = MOVED_ROUTES[path];
+  if (to === undefined) return null;
+  return search === "" ? to : `${to}?${search}`;
+}