fix(mobile): make pairing commands selectable and copyable

[sawy3r]

Summary

• make the relay setup and phone approval commands selectable
• add an accessible Copy button with Copy/Copied feedback and clipboard error handling
• preserve default and custom-port approval command formatting in a tested helper
• add a patch changeset for the mobile app

Root cause

The pairing guidance rendered terminal commands as plain, non-selectable text and did not expose any clipboard action. On iOS, that left users unable to transfer the install or approval command from the phone.

Validation

• pnpm --filter @codex-relay/mobile exec vitest run (4 files, 7 tests)
• pnpm --filter @codex-relay/mobile typecheck
• pnpm --filter @codex-relay/mobile lint
• pnpm test (30 files passed, 1 skipped; 290 tests passed, 4 skipped)
• pnpm typecheck
• pnpm lint
• pnpm --filter @codex-relay/mobile exec expo export --platform ios (successful native bundle)
• pnpm exec changeset status

Native iOS interaction was not manually exercised because this development host does not provide an iOS simulator.

Closes #63

[changeset-bot]

🦋 Changeset detected

Latest commit: e90f5ce

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@codex-relay/mobile	Patch

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