- MainContentTitle: truncate the session title with an ellipsis instead
of horizontal-scrolling it
- MessageComponent: use text-foreground for the provider logo chip so the
currentColor Codex/OpenAI mark is visible on the light theme
- MessageCopyControl: render the copy-format dropdown in a portal so it
escapes the chat message's `contain: paint` clip box; anchor it to the
trigger, flip above near the viewport bottom, close on scroll/resize
