/iblai-embed-tab

Add the agent Embed tab -- a comprehensive embed configuration interface with CSS/JS editors, custom floating bubble styling, visibility controls, shareable links, and an embedded agent preview iframe. This is one tab in the wider agent-settings family. All tabs share the same AgentSettingsProvider wrapper.

Do NOT add custom styles, colors, or CSS overrides to ibl.ai SDK components. They ship with their own styling. Keep the components as-is. Do NOT implement dark mode unless the user explicitly asks for it.