fix(wizard): show friendly model labels in picker

[zerone0x]

Description

Fixes #560 by making the setup wizard's model picker show provider-friendly model names alongside raw model ids when both are available.

This keeps the existing scroll/search selection flow, but makes large model lists much easier to scan.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Testing

Automated Tests

• New features include passing tests in .spec.ts/tsx files
• All existing tests pass (pnpm test:all completes successfully)
• Tests cover both success and error scenarios

Ran locally:

• npx --yes pnpm@11.0.9 test:ava source/wizards/steps/model-selection-list.spec.tsx
• npx --yes pnpm@11.0.9 exec biome check source/wizards/steps/model-selection-list.tsx source/wizards/steps/model-selection-list.spec.tsx
• npx --yes pnpm@11.0.9 exec tsc --noEmit

Manual Testing

• Tested with Ollama
• Tested with OpenRouter
• Tested with OpenAI-compatible API
• Tested MCP integration (if applicable)

Checklist

• Code follows project style guidelines
• Self-review completed
• Documentation updated (if needed)
• No breaking changes (or clearly documented)
• Appropriate logging added using structured logging (see CONTRIBUTING.md)