feat(clerk-js): Proactive session token refresh (#7317)

Author: jacekradko

.changeset/fresh-tigers-hunt.md

@@ -0,0 +1,5 @@
+---
+'@clerk/clerk-js': major
+---
+
+Add proactive session token refresh. Tokens are now automatically refreshed in the background before they expire, reducing latency for API calls near token expiration.

packages/clerk-js/bundlewatch.config.json

@@ -3,7 +3,7 @@
     { "path": "./dist/clerk.js", "maxSize": "538KB" },
     { "path": "./dist/clerk.browser.js", "maxSize": "66KB" },
     { "path": "./dist/clerk.chips.browser.js", "maxSize": "66KB" },
-    { "path": "./dist/clerk.legacy.browser.js", "maxSize": "105KB" },
+    { "path": "./dist/clerk.legacy.browser.js", "maxSize": "106KB" },
     { "path": "./dist/clerk.no-rhc.js", "maxSize": "305KB" },
     { "path": "./dist/clerk.native.js", "maxSize": "65KB" },
     { "path": "./dist/vendors*.js", "maxSize": "7KB" },