* feat(tui): Ctrl+O opens the model picker without clearing your draft
Reaching the model picker meant typing /model, which forces you to wipe
whatever you'd already drafted. Bind Ctrl+O to open the same picker overlay
directly, leaving the composer untouched. Ctrl+O is added to the textInput
pass-through allowlist so the composer doesn't swallow it, mirroring the
existing Ctrl+X session-switcher path.
* feat(tui): apply a mid-turn model switch at the next turn instead of rejecting it
Picking a model while a turn was streaming hit a 4009 'session busy' reject:
switch_model() mutates the agent's model/provider/base_url/client in place and
the worker thread reads those every iteration. Now config.set queues the pick
in session[pending_model_switch] and _apply_pending_model_switch applies it on
the turn thread at the next turn start, before any model call — no race, no
interrupt, no waiting on the client rebuild. The TUI paints the pick optimistically
and notes '(applies next turn)'.
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