Add Windows-only test for libedax initialization with non-ASCII book file paths (#902)

* Initial plan

* Add Windows-only test for non-ASCII book file path initialization

Co-authored-by: sensuikan1973 <23427957+sensuikan1973@users.noreply.github.com>

* dart fix . --apply

* Use Windows ACP (systemEncoding) instead of UTF-8 when building char* for libedax args.
Keeps edax-reversi C code unchanged while fixing non-ASCII path handling on Windows.

* mild fix

* mild fix

* debug

* remove Windows-specific handling in toCharPointer method

* tmp

* update

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sensuikan1973 <23427957+sensuikan1973@users.noreply.github.com>
Co-authored-by: sensuikan1973 <sensuikan1973@gmail.com>

Author: Copilot

.github/workflows/dart_ci.yaml

@@ -69,7 +69,7 @@ jobs:
       - name: install dependencies
         run: dart pub get
       - name: test
-        run: dart run test . --coverage=coverage --concurrency 1
+        run: dart run test . --coverage=coverage --concurrency 1 --verbose-trace
       - name: coverage
         run: dart run coverage:format_coverage --lcov --in coverage --out lcov.info
       - uses: codecov/codecov-action@v5

.libedax-version

@@ -1 +1 @@
-9ee809e0f95eb28b9d489869021db919e739b67f
+d44438a0b1f0d17229006a49e9e2f592c4f7f413

test/edax_command_test.dart

@@ -456,6 +456,25 @@ void main() {
     });
   });
 
+  group('char code', () {
+    test('initialize with non-ASCII book file path', () {
+      final tempDir = Directory.systemTemp.createTempSync('非ASCII_');
+      try {
+        final nonAsciiBookFile = '${tempDir.path}/本.dat';
+        File(_testBookFile).copySync(nonAsciiBookFile);
+        final edax = LibEdax()
+          ..libedaxInitialize(['', '-book-file', nonAsciiBookFile]);
+        sleep(const Duration(seconds: 1));
+        edax.edaxInit();
+        final moveList = edax.edaxGetBookMove();
+        expect(moveList.isNotEmpty, true);
+        edax.libedaxTerminate();
+      } finally {
+        tempDir.deleteSync(recursive: true);
+      }
+    });
+  });
+
   group('util command', () {
     test('popCount', () {
       final edax = LibEdax();