refactor(web): the composer's footer controls render in ComposerControlsBar

The model picker, traits picker, mode controls and overflow menu move
into one memoized component. Typing no longer re-renders the control
separators the composer body used to rebuild on every keystroke.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
959fea3146Julius Marminge committed on 10/21/2026, 7:56:49 PMparent13c6e32

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