fix: use arm32 safe bitkit-core

[ovitrif]

Context

Android production crash #983 is caused by ARM32 direct unsigned return handling in the generated bitkit-core Kotlin bindings.

This integration starts after the fixed bitkit-core mobile release is available.

Blocked by synonymdev/bitkit-core#149.

Scope

• Update bitkit-core-android to the fixed release.
• Build the mainnet release AAB and verify its dependency metadata and ARMv7 split artifact.
• Validate fresh-install and upgrade paths on a physical ARM32 device after ART speed compilation.
• Run an ARM64 release smoke test.
• Roll out through Play staged rollout gates and monitor the current app version by ABI.

Acceptance criteria

• The release AAB identifies the fixed bitkit-core version.
• The Play-style ARMv7 split contains the expected native library.
• The affected wallet and activity flows complete on ARM32 after ART speed compilation.
• The Android compile, unit-test, lint, and applicable release E2E suites pass.
• Production monitoring shows a complete 28-day reporting window without a current-version recurrence.

Parent epic: #986

[ovitrif]

Folded into #1206. One Android PR for both lib bumps.