[Feature]: Add Carousel / ScrollingList components on Android

[soulcramer]

Outcome

Carousel and ScrollingList components exist in Spark Android, closing the gap with Spark web and iOS where both are already available.

Problem

Neither Carousel nor ScrollingList exists on Android. Callers must build their own implementations, which diverge from the design system. No timeline was given for adding these components.

Context

No carousel component directory exists under spark/src/main/kotlin/com/adevinta/spark/components/ today. The equivalents on web and iOS can be used as a design reference.

Scope

• Add Carousel and ScrollingList composables under spark/src/main/kotlin/com/adevinta/spark/components/carousel/ (or a suitably named package).
• Components should follow existing Spark theming and slot conventions.

Acceptance criteria

• Both components are published in the Spark component catalogue.
• Each supports the standard Spark intent and theming tokens where applicable.
• Screenshot and interaction tests cover the primary usage of each component.

Evidence

• Slack: https://adevinta.enterprise.slack.com/archives/C04QQEU3Y2H/p1768497008325119 — N.M.W., 2026-01-15
• spark/src/main/kotlin/com/adevinta/spark/components/ — no carousel/ subdirectory exists here today