fix: update DataStore for 16 KB compatibility

[ovitrif]

Goal

Update AndroidX DataStore from 1.2.0 to 1.2.1 so Bitkit clears Android's page-size compatibility alert.

Parent: #1047

Causal evidence

A clean uninstall/install of mainnetDebug on Android 17/API 37 with PAGE_SIZE=16384 changed only DataStore. The 1.2.1 build cleared the complete alert and produced pageSizeCompat=0 while every other native dependency remained unchanged.

The earlier Unknown error entries were collateral compatibility-mode reporting rather than evidence of separate dependency failures.

Implementation

• fix: update DataStore for 16 KB compatibility #1107 updates DataStore to 1.2.1.

Acceptance criteria

• DataStore is the only dependency version changed.
• A clean uninstall/install on Android 17/API 37 with PAGE_SIZE=16384 reaches Bitkit without the compatibility alert.
• The runtime result reports pageSizeCompat=0.
• The repository's compile, test, lint, dependency-resolution, and hosted CI/E2E checks pass.
• fix: update DataStore for 16 KB compatibility #1107 receives approval and merges.

[ovitrif]

The Android-owned compatibility change is ready for review in #1107 at exact head c0eb7ecc5f031e4f097de783bef3fa567ecabb4d.

Evidence:

• Two independent full Sol xhigh review passes were mechanically validated against the exact head with zero canonical findings.
• A clean combined mainnetDebug APK/AAB build consumed the four proven Maven Local producer artifacts and passed the all-library 16 KB validator across every packaged ABI and native library.
• A fresh install on the Android 17 Pixel_10_Pro_XL emulator with a true 16 KB kernel reported PAGE_SIZE=16384, no compatibility alert, and pageSizeCompat=0.
• The exact-source runtime flow completed onboarding, wallet creation, and a camera QR scan of 1BoatSLRHtKNngkdXEeobR76b53LETtpyT for 1,000 sats.
• Hosted checks are green: general build, local/staging builds, all ten local/staging E2E shards, aggregate E2E status, lint, detekt, and Greptile.
• Greptile's scanner-state concern was disproved by the existing screen-owned retry assignment; the thread was resolved without a code change.
• Ben and Corey are requested. Merge, tagging, publication, and release remain gated on non-author approval of this exact head.