fix(model-picker): improve focus and reasoning control

[drewstone]

Summary

• focus the model search input immediately when the picker opens
• restyle curated popular models as a clearer Top models section
• add a shared ReasoningLevelPicker for chat composer reasoning depth controls

Verification

• pnpm typecheck
• pnpm test src/dashboard/model-picker.test.tsx
• pnpm build

[tangletools]

⚠️ Review Failed — bd91b843

All review passes errored. No verdict published. Push a new commit to trigger a re-review.

_{tangletools · 2026-05-23T23:31:17Z}