fix: mark setConnectionMode as @internal with not-ready warning

Author: kinyoklion

packages/sdk/browser/example-fdv2/src/app.ts

@@ -284,12 +284,14 @@ const main = async () => {
   ];
   connectionModes.forEach((mode) => {
     document.getElementById(`btn-mode-${mode}`)!.addEventListener('click', () => {
+      // @ts-ignore setConnectionMode is @internal — experimental FDv2 opt-in
       client.setConnectionMode(mode);
       updateModeStatus(mode);
       log(`setConnectionMode('${mode}')`);
     });
   });
   document.getElementById('btn-mode-clear')!.addEventListener('click', () => {
+    // @ts-ignore setConnectionMode is @internal — experimental FDv2 opt-in
     client.setConnectionMode(undefined);
     updateModeStatus(undefined);
     log('setConnectionMode(undefined)');

packages/sdk/browser/src/LDClient.ts

@@ -41,6 +41,11 @@ export type LDClient = Omit<CommonClient, 'getConnectionMode' | 'getOffline' | '
    * from the interface.
    */
   /**
+   * @internal
+   *
+   * WARNING: This method is not ready for use and may change or be removed
+   * without notice.
+   *
    * Sets the connection mode for the SDK's data system.
    *
    * When set, this mode is used exclusively, overriding all automatic mode