The compact-reasoning-label plugin rewrites the model pill's textContent
through a MutationObserver to show a compact reasoning label. Give it the
sanctioned seam instead.
COMPOSER_AREAS.modelPill takes data contributions with a label(ctx) resolver
({ model, reasoningEffort, compact }); the first non-null label wins and a
declining (or throwing) provider leaves the core label. The pill keeps its
chrome, pin dot, and menu — only the text changes.
Wishlist item 5 of #116305; unblocks compact-reasoning-label (#115962).
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