# DS-001 — Reusable WALKA section header

Status: COMPLETED
Issue: #87
Parent UI Task Master: #85
Implementation branch: `agent/ds-001-section-header`
Pull request: #88
Final implementation head: `e8b037e11677eeeda5c91d5766e76a96a2750367`
Stable merge: `519af4855dc021f6f35936fdf1d73484160005ec`

## Goal

Create a small reusable design-system section heading for WALKA screens so eyebrow/title hierarchy is not repeatedly hard-coded inside large feature files.

## Atomic scope delivered

- `WalkaSectionHeader` in `mobile/lib/design_system/components/typography/walka_section_header.dart`.
- Gold eyebrow + navy serif title defaults aligned to the released Home collection heading contract.
- Center and start alignment modes.
- Optional trailing action slot.
- Header semantics for assistive technologies.
- Focused widget tests for default style/semantics and start-aligned action behavior.

Production screen adoption remains in the corresponding screen modularization tasks so this design-system atom stays independently mergeable and minimizes team conflicts in shared feature files.

## Guardrails preserved

- No Product Master changes.
- No catalog/navigation behavior changes.
- No Favorites changes.
- No Amazon handoff changes.
- No backend changes.
- `Images/` untouched.
- No ZIP delivery.

## Validation receipts

### Pull request

- PR: #88.
- Final head: `e8b037e11677eeeda5c91d5766e76a96a2750367`.
- Workflow: `31384357797` / run #452 — GREEN.
- Flutter Analyze: GREEN.
- Full Flutter tests: GREEN.
- Android runner generation: GREEN.
- WALKA Android branding: GREEN.
- Release APK build/upload: GREEN.
- Candidate artifact: `9061240464`.
- Artifact digest: `sha256:8033bc7c5a6925463b1c91615de14622cf79f2acf3e47ccc844fb4bb1cb8976b`.

### Stable main

- Squash merge: `519af4855dc021f6f35936fdf1d73484160005ec`.
- Its first stable-main run #454 reached green Analyze + full tests and was cancelled during APK build only because the team immediately advanced `main` with DESIGN-007B.6.
- Successor `main` commit `61b21f8dee1dc1269855fb778108a1ab8d001b7f` has DS-001 as its direct parent, so the successor stable run validates DS-001 plus the newer team slice together.
- Successor workflow: `31384966694` / run #455 — GREEN.
- Stable artifact: `9061471496`.
- Stable artifact digest: `sha256:2563d0814a1172f81239935584af34c07ab1e58f129539e00f5f2951e704a9c3`.
- Verified APK publication commit: `df86e391ce0ca61d64298846cb99127a0eef8739`.
- Verified APK source: `61b21f8dee1dc1269855fb778108a1ab8d001b7f`.
- App version: `1.2.0+120`.
- Verified APK type: `universal-release`.
- Verified APK bytes: `52,717,255`.
- Verified APK SHA-256: `8ee89ddda7d78bb55e1a5f1c7c2f266742edfd1575414c880d221a4516d88998`.

## Definition of done

- [x] Reusable component exists in its own small file.
- [x] Default hierarchy matches the stable Home collection heading contract.
- [x] Accessibility semantics are covered.
- [x] Optional action/alignment states are covered.
- [x] Flutter Analyze is green.
- [x] Full Flutter tests are green.
- [x] PR-context release APK gate is green.
- [x] Stable merge to `main` completed.
- [x] Successor stable-main run containing DS-001 is green.
- [x] `Last verified APK/WALKA-latest.apk` was republished with a matching verification receipt.

## Next

Adopt `WalkaSectionHeader` in screen-level modularization tasks such as `HOME-007` without changing approved visual fidelity.