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webui : Replace alert and confirm with custom modals. (#13711) * Replace alert and confirm with custom modals. This is needed as Webview in VS Code doesn't permit alert and confirm for security reasons. * use Modal Provider to simplify the use of confirm and alert modals. * Increase the z index of the modal dialogs. * Update index.html.gz * also add showPrompt * rebuild --------- Co-authored-by: igardev <ivailo.gardev@akros.ch> Co-authored-by: Xuan Son Nguyen <son@huggingface.co>