Adds three one-click model shortcuts (haiku / sonnet / opus) at the
bottom of the agent overflow menu (⋯), below a separator and a small
'model' section label.
- The active model alias is highlighted with .active (purple border +
tint) so the operator can see at a glance which model is current.
Matching tolerates both short aliases (haiku) and full API names
(claude-3-5-haiku-20241022) via an endsWith check.
- Clicking the active model is a no-op (closes menu, no POST).
- Clicking a different alias calls postModel() and closes the menu.
- renderModelChip() keeps the picker buttons in sync on every
/api/state refresh without rebuilding the menu.
Before this change the operator had to type /model <name> in the
compose box. The overflow menu provides a discoverability path for
operators who don't remember slash commands.
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