v1.13.0 — On-device compositor + GIF export 📽️

On-device compositor + GIF export — the flagship "2.0" 📽️

KMPMedia could put one piece of media in one shape. 1.13.0 adds Bet 3: compose several layers on one timeline, animate them with keyframes, preview the result live at 60fps, and export it to a shareable animated GIF — all authored on device. No other KMP library does compose-and-export.

Added

• OGComposition — a fixed width × height canvas, a durationMs timeline at fps, a background colour, and a back-to-front stack of OGCompositionLayers. Each layer is a still image or a solid fill, placed in a box whose x / y / scale / rotation / opacity are each an animatable keyframe track, optionally clipped to any KMPMedia shape (built-in, lasso, multi-region, CircleShape, …), visible over [startMs, endMs].
• OGCompositionView — plays the composition on the Compose frame clock (holds 60fps, no intermediate bitmap) or acts as a scrubber via positionMs.
• OGComposition.exportGif() — renders every frame offscreen and encodes one looping animated GIF with the built-in pure-Kotlin OGGifEncoder (median-cut palette + LZW) — no dependency, no platform encoder, identical bytes on Android and iOS. Returns the ByteArray; where to save/share is the app's call. renderFrame(timeMs) grabs any single frame.
• OGKeyframedFloat / OGKeyframe / OGEasing — an animatable float track (LINEAR / EASE_IN / EASE_OUT / EASE_IN_OUT), parse-nothing / lerp-per-frame.
• OGGifEncoder — a standalone, dependency-free GIF89a encoder usable on its own for any frame list.

Everything is pure commonMain and purely additive (new com.solidkey.painpoints.compositor package, nothing existing changed). 19 tests green on JVM + iOS. See docs/COMPOSITOR.md. MP4 / frame-sequence export are the planned follow-ups.

implementation("se.solidkey:kmpmedia-lib:1.13.0")