fix(ui): replace the key detail URL entry when a virtual key is rotated (#39471)

Regenerating a key repointed ?key= at the rotated hash with a pushed history
entry, so pressing the browser Back button landed on the hash that had just
been revoked. /key/info answers 404 for it and the page shows "Key not found
in database".

The rotated hash now replaces the current entry instead of pushing a new one,
so Back from a just-regenerated key returns to the key list. Opening a key
from the table still pushes, so Back from a normally opened key is unchanged.

ui/litellm-dashboard/src/components/VirtualKeysPage/VirtualKeysTable.test.tsx

@@ -182,6 +182,8 @@ const lastSearchParam = (onUrlUpdate: Mock<OnUrlUpdateFunction>, name: string) =
 
 const lastKeyParam = (onUrlUpdate: Mock<OnUrlUpdateFunction>) => lastSearchParam(onUrlUpdate, "key");
 
+const lastHistoryMode = (onUrlUpdate: Mock<OnUrlUpdateFunction>) => onUrlUpdate.mock.calls.at(-1)?.[0].options.history;
+
 beforeEach(() => {
   vi.clearAllMocks();
 
@@ -377,6 +379,7 @@ it("clicking the key cell deep-links via ?key=", async () => {
   await waitFor(() => {
     expect(lastKeyParam(onUrlUpdate)).toBe(mockKey.token);
   });
+  expect(lastHistoryMode(onUrlUpdate)).toBe("push");
 });
 
 it("renders KeyInfoView when the URL has ?key= for a key on the current page, without refetching it", async () => {
@@ -417,6 +420,7 @@ it("repoints ?key= to the rotated hash once the regenerate dialog is dismissed",
   await waitFor(() => {
     expect(lastKeyParam(onUrlUpdate)).toBe("rotated-hash-456");
   });
+  expect(lastHistoryMode(onUrlUpdate)).toBe("replace");
 });
 
 it("fetches the key by id when the URL has ?key= for a key not in the loaded page", async () => {

ui/litellm-dashboard/src/components/VirtualKeysPage/VirtualKeysTable.tsx

@@ -217,7 +217,7 @@ export function VirtualKeysTable({ headerActions }: VirtualKeysTableProps) {
     (updated: Partial<KeyResponse>) => {
       const rotatedToken = updated.token ?? updated.token_id;
       if (!rotatedToken || rotatedToken === selectedKeyId) return;
-      void setSelectedKeyId(rotatedToken);
+      void setSelectedKeyId(rotatedToken, { history: "replace" });
       void refetch();
     },
     [refetch, selectedKeyId, setSelectedKeyId],