Port a React Native Slice

Implement one approved vertical slice from an existing parity contract. Reimplement behavior deliberately; do not perform generic JSX-to-Swift translation.

Safety contract

Before writing, require:

• one explicitly approved feature slice and its current parity contract;
• one explicit target directory and target module;
• an approved backend contract and licensing/provenance decision;
• permission to change the named files or create named files inside the target directory.

Stop without edits if source scope, target module, backend contract, licensing, parity expectations, or file ownership is ambiguous. A broad request such as “port the app” is not approval for multiple slices.

Write boundary