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* chore(build): bump AGP 9.0.1 → 9.1.1 — fix R8 kotlin metadata warnings Kotlin 2.4.10 emits metadata the R8 bundled in AGP 9.0.1 cannot parse: 'WARNING: R8: An error occurred when parsing kotlin metadata' spam on every release build (the Kotlin↔R8 compatibility matrix requires R8 ≥ 9.1.29 for Kotlin 2.4). AGP 9.1.1 bundles R8 9.1.x — release build now warning-free. Verified locally: assembleRelease green with zero metadata warnings; unit suite 1029/0; device smoke — app connects with preserved token under R8 9.1. * fix(chat): removeLast() → removeAt(lastIndex) — API 35 call on minSdk 26 AGP 9.1's lint (newer NewApi check) flags java.util.List#removeLast(), resolved only as a Kotlin stdlib extension below API 35. Same semantics, lint-clean. --------- Co-authored-by: M57 <hy4ri@users.noreply.github.com>