OpenAI Codex 0.168.0 adds model provider picker and side chat pane

OpenAI shipped version 0.168.0 of its Codex CLI. The release adds a model provider browser under Sessions, where users choose the default provider for new chats; open and resumed chats keep the provider they were saved with. With audio-capable models, users can attach recordings, and Codex drops rejected clips on later turns while using clip length to keep short ones in context. Another flag enables animated GIF generation and editing with frame count and timing controls. Fixes include scoping local history to the signed-in ChatGPT account and letting idle local MCP servers on Windows release filesystem I/O.