The MoA preset section in the composer model dropdown presented presets like
persistent model selections, but selecting one dispatched the one-shot `/moa`
command (command.dispatch name=moa) — it ran a single turn through MoA and then
silently reverted to the prior model. The user saw MoA context for one message,
then it vanished with no indication.
Route MoA preset selection through the same persistent path real provider
selections use: onSelectModel({ model: preset, provider: 'moa' }) →
config.set model="<preset> --provider moa" → the gateway's switch_model. The
check mark now reflects the real current selection (currentProvider === 'moa'
&& currentModel === preset) instead of transient local state, and the
now-unused activeMoaPreset state is removed.
Tests: new model-menu-panel.test.tsx (2) — selecting a preset calls
onSelectModel with provider 'moa' (persistent), and the check renders on the
active preset. tsc -b clean.
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