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/test/routes.test.mjs

@@ -1,7 +1,12 @@
 // The shell's per-route layout: which paths are full-bleed. Run by `npm test`.
 import assert from "node:assert/strict";
 import { test } from "node:test";
-import { isFullBleedRoute, visibleNavItems } from "../src/shell/routes.ts";
+import {
+  MOVED_ROUTES,
+  isFullBleedRoute,
+  movedHref,
+  visibleNavItems,
+} from "../src/shell/routes.ts";
 
 test("the start page is full-bleed", () => {
   assert.equal(isFullBleedRoute("/"), true);
@@ -42,3 +47,25 @@ test("hide developer details takes the components tab out of the nav", () => {
 test("with it off the nav is whole again", () => {
   assert.deepEqual(visibleNavItems(NAV, false), NAV);
 });
+
+test("an old address goes to the tab that holds its page, query kept", () => {
+  assert.equal(movedHref("/alerts", ""), "/reports");
+  assert.equal(movedHref("/issues", ""), "/reports");
+  assert.equal(movedHref("/review", ""), "/jobs");
+  assert.equal(movedHref("/schedules", ""), "/messages");
+  assert.equal(
+    movedHref("/builds", "run=atlas-abc-1"),
+    "/jobs?run=atlas-abc-1",
+  );
+});
+
+test("a current tab is not moved", () => {
+  assert.equal(movedHref("/jobs", ""), null);
+  assert.equal(movedHref("/agents", "x=1"), null);
+});
+
+test("no old address leads to another old address", () => {
+  for (const to of Object.values(MOVED_ROUTES)) {
+    assert.equal(to in MOVED_ROUTES, false, to);
+  }
+});