Rework the new-chat role-card empty state:
- Remove the "Universal assistant" card; universal assistant is now the
implicit default the user gets by typing without picking a card.
- Show each role's description on its card (under the emoji and name).
- Clicking a card immediately starts the chat: it binds the role to the
new chat and sends the default opening prompt "Take a look at the
current document" (one click, no separate select step). roleIdRef is
set synchronously before sendMessage so the create request carries the
role.
- Show the current role's name in the window header badge and as the
assistant's display name (transcript label + "… is typing…"), falling
back to "AI agent" for a role-less chat. selectChat resets the picked
role so it cannot leak into an unrelated existing chat.
- Add the "Take a look at the current document" i18n key (en-US, ru-RU).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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