feat(banner): Solana migration announcement banner

[vilenarios]

Summary

• Replace Hyperbeam migration banner with Solana migration announcement: "Ar.io is migrating to Solana! Purchases are paused and will resume shortly. Register before the May 15, 2026 snapshot!" with a "Learn More" link to https://ar.io/solana-migration/
• Update purchase-disabled tooltip to reference Solana migration
• Show banner on all pages (except settings)
• Bump version to 1.30.2

Test plan

• Verify banner displays on home, manage, register, and other pages
• Verify banner does not display on settings pages
• Verify "Learn More" link opens https://ar.io/solana-migration/ in new tab
• Verify disabled purchase buttons show updated Solana tooltip
• Check banner layout on mobile

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9b849577-d2f9-4f3f-9065-1411ae7efed7

📥 Commits

Reviewing files that changed from the base of the PR and between 268342a and 3bc7e3d.

📒 Files selected for processing (6)

• CHANGELOG.md
• CLAUDE.md
• package.json
• src/components/layout/Layout/Layout.tsx
• src/components/layout/Layout/TopBanner.tsx
• src/utils/constants.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/solana-migration-banner

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