Initial Hex Mines fork with hex tiles and mine-count slider.

Based on StefanOltmann/mines (AGPL-3.0): flat-top hex grid, configurable
board size, and a mine-count slider replacing fixed difficulty presets.

Co-authored-by: Cursor <[email protected]>

build-debug-apk.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")" && pwd)"
+export ANDROID_HOME="${ANDROID_HOME:-$ROOT/.android-sdk}"
+export JAVA_HOME="${JAVA_HOME:-$ROOT/.jdks/jdk-21.0.11+10}"
+export PATH="$JAVA_HOME/bin:$PATH"
+cd "$ROOT"
+./gradlew :app:assembleDebug "$@"
+echo
+echo "APK: $ROOT/app/build/outputs/apk/debug/app-debug.apk"