assistant: opening the canvas loads the preferred model

A preferred model that only took effect from the settings page did
nothing the next time another client had swapped it out. On this
desktop one model and one client run at a time, so opening the canvas
is when the assistant's model should come back: if the preferred one is
neither loaded nor loading, it is loaded, and the canvas header says so
until the router reports it in. The daemon still never asks for a model;
with no preference set nothing changes.

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

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