# DS-012 — Reusable WALKA favorite button

Status: COMPLETED
Issue: #111
PR: #117
Parent UI Task Master: #85
Implementation branch: `agent/ds-012-favorite-button`

## Delivered

- Added `WalkaFavoriteButton` under `mobile/lib/design_system/components/buttons/`.
- Centralizes selected/unselected heart icon, WALKA gold/navy state colors, tooltip wording and accessible toggled semantics.
- Keeps Favorites persistence and product state entirely feature-owned through a simple callback contract.
- Uses the shared `WalkaMotion.standard` duration and collapses animation to zero when accessibility requests reduced motion.
- Supports disabled state and optional tooltip/color overrides.
- Focused widget tests cover visual states, callback, semantics, disabled state, animation keys and reduced-motion behavior.

## Guardrails

- No persistence model changes.
- No Product Master, catalog, backend or Amazon-boundary changes.
- No feature-page integration in this atomic slice.
- No protected `Images/` changes.

## Validation receipts

- PR head: `ec6ad9477f3feabde0ca1b329d34a5a88c77c892`.
- PR workflow: run #497 / `31391027138` — Flutter Analyze, full Flutter tests and Android release APK Green.
- PR APK artifact: `9063827139`, digest `sha256:47ab6789f6e3f3ca1326b15de4ed74af818038fd0cef00b0469ba060ea582da1`.
- Stable merge: `f3b6d465c9b69d8b58bf666f7d59ed38fcbfada1`.
- Combined stable-main validation containing DS-008..DS-012: run #504 / `31391703159` Green, including release APK and stable publication.
- Combined stable APK artifact: `9064126077`, digest `sha256:36c5dc7461014af8a6f628372325ff73a562d64ef5a3b0172cc24e0d091591bc`.
- Stable verified APK: `1.2.0+120`, source `f3b6d465c9b69d8b58bf666f7d59ed38fcbfada1`, 52,717,255 bytes, SHA-256 `902b6986a5b748f1b9351441ac4d0bb162a1cbcc22d612b8fba7d47677c36905`.
