Log message when failing to decode JWT (#30315)

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GitOrigin-RevId: 74b36f04ce3221cf9202ca5438d2eeb2e0a5658e

src/browser/sync/authentication_manager.ts

@@ -404,7 +404,10 @@ export class AuthenticationManager {
   private decodeToken(token: string) {
     try {
       return jwtDecode(token);
-    } catch {
+    } catch (e) {
+      this._logVerbose(
+        `Error decoding token: ${e instanceof Error ? e.message : "Unknown error"}`,
+      );
       return null;
     }
   }