feat: Support 8 byte colors + non-linearity in hash

[abelonogov-ld]

Summary

• Support 8 byte color
• Add multiplication to fast hashing to achieve non-linearity
• Compensate slow down but deeper optimization (performance stays the same)
• remove benchmake code and benchmark screenshots from repository

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Note

Medium Risk
Moderate risk because TileSignatureManager now returns null when the JNI library isn’t present, which can disable tiled diffing/session replay in environments without session_replay_c. Also adjusts keyframe selection logic for OverlayTiles, which could affect replay fidelity/size.

Overview
Session replay tile hashing is now native-only. TileSignatureManager drops the Kotlin fallback/overloads and returns null unless the session_replay_c JNI library is available.

Tiled diff keyframe selection is adjusted. TileDiffManager changes OverlayTiles logic to treat layers <= 0 as always-keyframe and to prioritize periodic keyframes before falling back to “whole-screen diff” detection.

Benchmark and parity test code removed from the e2e app. Deletes the Compose BenchmarkActivity/executor/assets, removes its launcher UI/manifest entry, removes the benchmark serialization dependency, and deletes an Android instrumentation test that validated native/Kotlin hash parity.

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