fix(gui): carry Claude helper model labels onto dev2-go (#623)

[Wibias]

Summary

• Carries the fix(gui): render Claude helper model labels #623 squash merge onto dev2-go (GUI + test only).
• Source: a2981c87 on dev.

Go port

No Go counterpart. GUI-only React label rendering in Claude Code settings.

Test plan

• CI on dev2-go
• Cherry-pick of a2981c87 applied cleanly

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