Summary

Adds a compact model picker to the chat composer so users with multiple configured custom models can switch the current agent model from the chat box. Model labels show only the model id after the runtime provider prefix, and model-only changes update agent/runtime metadata without triggering a gateway reload or restart.

chat_model_picker_clean_switch.mp4

Related Issue(s)

N/A

Type of Change

• Bug fix
• New feature
• Documentation
• Refactor
• Other

Validation

• pnpm exec vitest run tests/unit/agents-routes.test.ts tests/unit/model-options.test.ts tests/unit/chat-input.test.tsx tests/unit/provider-runtime-sync.test.ts
• pnpm run ext:bridge && pnpm run typecheck && pnpm run lint && pnpm test
• pnpm run build:vite && xvfb-run -a pnpm exec playwright test tests/e2e/chat-model-picker.spec.ts tests/e2e/chat-latex-rendering.spec.ts tests/e2e/chat-skill-trigger-i18n.spec.ts

Checklist

• I ran relevant checks/tests locally.
• I updated docs if behavior or interfaces changed.
• I verified there are no unrelated changes in this PR.

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