/iblai-agent-support

Add the agent Support tab -- human support ticket management for the agent. Support lets people chatting with the agent hand the conversation over to a human; each request shows up as a ticket that admins can review, reply to, and resolve. The tab has an availability toggle, user and status filters, a paginated ticket inbox, and a ticket detail pane with status control and a reply thread. This is one tab in the wider agent-settings family. All tabs share the same AgentSettingsProvider wrapper.