Replace `Lottie` Android with KMP alternative

[Kaaveh]

Context

Lottie (com.airbnb.android:lottie-compose:6.7.1) is Android-only. It's used for the empty state animation in the favorites tab.

Affected files

• library/designsystem/src/main/java/.../LottieAnimationComposable.kt — wrapper composable
• library/designsystem/src/main/java/.../EmptyStateAnimation.kt — uses LottieCompositionSpec.RawRes(R.raw.empty_state_animation)
• library/designsystem/src/main/res/raw/empty_state_animation.json — animation JSON

Options

Option	Pros	Cons
Compottie (io.github.nicholasmata:compottie)	KMP Lottie, similar API	Newer library, less battle-tested
expect/actual wrapper	Keep existing Android impl	Need iOS implementation separately
Replace with static illustration	No dependency	Loses animation

What needs to happen

1. Choose a replacement approach
2. Update libs.versions.toml with new dependency
3. Rewrite LottieAnimationComposable.kt using new library or expect/actual
4. Move animation JSON to CMP resources directory (or expect/actual resource loading)
5. Update EmptyStateAnimation.kt to use new API

Acceptance Criteria

• No com.airbnb.android:lottie-compose dependency in shared modules
• Empty state animation still works on Android
• Compiles for non-Android targets