feat(cds-android): port Button to Compose and add RN-to-Compose skill

[cb-ekuersch]

What changed? Why?

Ports the CDS mobile Button to a public Jetpack Compose implementation in packages/cds-android, including shared interaction affordances (CdsInteractionDefaults), Robolectric behavior tests, demo gallery coverage, and package docs.

Also adds the cds-rn-to-compose agent skill to guide future React Native → Compose ports and audits, with discovery/audit checklists, CompositionLocal theming guidance, and a living learnings log.

Root cause (required for bugfixes)

N/A — feature work.

UI changes

iOS Old	iOS New
N/A	N/A

Android Old	Android New
Sample controls in demo app	Public CDS Button with variants, states, icon slots, and gallery section

Web Old	Web New
N/A	N/A

Testing

How has it been tested?

• Unit tests
• Interaction tests
• Pseudo State tests
• Manual - Web
• Manual - Android (Emulator / Device)
• Manual - iOS (Emulator / Device)

Testing instructions

yarn nx run cds-android:test
yarn nx run cds-android:build
yarn nx run android-app:build

With an emulator or device connected:

yarn nx run android-app:launch

Verify Button variants, transparent mode, disabled/loading states, icon slots, and full-width layout in the demo app gallery.

Illustrations/Icons Checklist

Required if this PR changes files under packages/illustrations/** or packages/icons/**

N/A

Change management

type=routine
risk=low
impact=sev5

automerge=false

Made with Cursor

[cb-heimdall]

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