feat(clerk-js): Send previous session token on /tokens requests

Send the current session JWT as `token` in the POST body when
requesting a token refresh. This lets the FAPI Proxy forward it to
Session Minter for claim cloning without a DB read.

Uses conditional spread so the key is absent (not `token=`) when
there's no previous token (first mint).

Author: nikosdouvlis

.changeset/session-minter-send-token.md

@@ -0,0 +1,5 @@
+---
+'@clerk/clerk-js': patch
+---
+
+Send previous session token on `/tokens` requests to support Session Minter edge token minting.

packages/clerk-js/src/core/resources/Session.ts

@@ -480,7 +480,12 @@ export class Session extends BaseResource implements SessionResource {
   ): Promise<TokenResource> {
     const path = template ? `${this.path()}/tokens/${template}` : `${this.path()}/tokens`;
     // TODO: update template endpoint to accept organizationId
-    const params: Record<string, string | null> = template ? {} : { organizationId: organizationId ?? null };
+    const params: Record<string, string | null> = template
+      ? {}
+      : {
+          organizationId: organizationId ?? null,
+          ...(this.lastActiveToken ? { token: this.lastActiveToken.getRawString() } : {}),
+        };
     const lastActiveToken = this.lastActiveToken?.getRawString();
 
     const tokenResolver = Token.create(path, params, skipCache ? { debug: 'skip_cache' } : undefined).catch(e => {