assistant: grey out the mic when the model cannot hear

AssistantModule keeps each router model's input_modalities and exposes
hears: the model loading, else the first not unloaded (the daemon's
rule), reports audio. Unknown inputs or a router that is down count as
yes; the daemon's error covers the rest. The model list is now read on
every canvas open, not only when a preferred model is set, so hears is
current when the card shows.

Checked: the rule against the router's live /models (Gemma resident:
on; Qwen resident or loading: off; router down: on). Not yet seen by
eye after a desktop shell reload.

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

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