ibm-cloud-security / appid-clientsdk-js

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feat!: Changing Silent login from using hidden iframe to visible popup

feat(silent login): migrate silent login to popup-based authentication

Silent login now uses popup-based authentication instead of hidden iframes to support modern browsers that block 3rd-party cookies. This ensures silent authentication works across all browsers regardless of cookie settings.
- Removed IFrameController and iframe-based authentication   
- Added PopupController with 5-second timeout
- Updated all tests to use popup-based mocking
BREAKING CHANGE: Silent login behavior changed from iframe to popup. Users may see a popup window during silent authentication

BREAKING CHANGE: Silent login now uses popup windows instead of hidden iframes. This may affect applications that expect completely silent authentication with no UI. The change ensures compatibility with modern browsers blocking 3rd-party cookies.

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