assistant: pick the chat's model, local or cloud, from the header

The canvas keeps the chat's model from the daemon (hello.chat_model,
conversation.model), falls back to the preferred one (set from shell.qml
later), and sends it as model with every ask, typed or spoken. The To .md
write stays without one: the daemon always writes with the local model.

Models.qml lists the daemon's models event, router models then cloud
ones, in a panel like History. It opens from the header label in chat,
from a Model button next to History outside chat, and with Ctrl+M. The
models are asked for on hello too, so the cloud marker is right before
the panel was ever opened. Moving a chat with turns to a cloud model
says once that its history goes to that provider.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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