Replace the five clinical context selects (access, response mode, specialty,
facility, time range) with one model picker styled like the reference design:
a primary model list with descriptions, an Effort submenu, and a "More models"
submenu. Move the Add-patient pill up into the toolbar and drop the now-empty
bottom context-selector card so the input is a single clean rounded surface.
Model/effort selection is lifted to ChatPanel so it can travel with each send
(wired to the backend agent in a later phase). Adds a shared model catalog
(lib/ai-models.ts) reused by the picker, Settings, and the chat wiring.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>