Add setting to disable referral/promotional banners

Feature Request

Add a settings.json flag (e.g., "showPromotions": false or "hideReferralBanner": true) to disable the "Earn $10 — Share Claude Code" referral banner in the CLI UI.

Why

• Power users running Claude Code as an always-on production tool (trading systems, automation, CI pipelines) don't want promotional UI elements consuming screen real estate or causing alarm during security-sensitive operations.
• The banner appearing unexpectedly after an update triggered a "have we been compromised?" investigation — promotional banners in a CLI tool look indistinguishable from prompt injection at first glance.
• There's currently no config flag, env var, or persistent dismiss mechanism to turn it off.

Suggested Implementation

Any of these would work:

• "showPromotions": false in ~/.claude/settings.json
• CLAUDE_NO_PROMOTIONS=1 env var
• A persistent dismiss state that survives session restarts

Environment

• Claude Code v2.1.91
• macOS (Darwin arm64)
• Max plan subscriber

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