chore: Halkyon Learn moves into apps/learn

Its server, client, app and curator, and the tools that write its
assets (maps, Anki fixtures, icons), as they are; paths are fixed in
the commits that follow.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_curator/test/kanjidic_test.dart

@@ -1,125 +0,0 @@
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:halkyon_learn_curator/src/sources/kanjidic.dart';
-import 'package:test/test.dart';
-
-void main() {
-  late List<Map<String, Object?>> lines;
-
-  setUpAll(() async {
-    final jlpt = await readKanjiJlpt(
-      File('test/fixtures/kanji-data-sample.json'),
-    );
-    lines = [
-      for (final line in kanjidicDictionary(
-        await File('test/fixtures/kanjidic2-sample.xml').readAsString(),
-        jlpt: jlpt,
-      ))
-        jsonDecode(line) as Map<String, Object?>,
-    ];
-  });
-
-  Map<String, Object?> entry(String character) =>
-      lines.skip(1).firstWhere((line) => line['id'] == character);
-  Map<String, Object?> fields(String character) =>
-      entry(character)['entry']! as Map<String, Object?>;
-
-  test('the header says the file holds characters, and whose they are', () {
-    final header = lines.first;
-    expect(header['source'], 'kanjidic');
-    expect(header['kind'], 'characters');
-    expect(header['sourceVersion'], '2026-282');
-    expect((header['language'], header['glossLanguage']), ('ja', 'en'));
-    expect(header['license'], 'CC-BY-SA-4.0');
-    expect(
-      [
-        for (final credit in header['credits']! as List)
-          (credit as Map)['name'],
-      ],
-      ['KANJIDIC2', 'JLPT kanji lists'],
-    );
-  });
-
-  test('a kanji: its readings, English meanings only, grade, strokes, '
-      'frequency and JLPT level', () {
-    final eat = entry('食');
-    expect(eat['headword'], '食');
-    expect(eat['reading'], isNull);
-    expect(eat['labels'], ['jlpt:n5', 'grade:2', 'radical:184']);
-    expect(fields('食'), {
-      'meanings': ['eat', 'food'],
-      'on': ['ショク', 'ジキ'],
-      'kun': ['く.う', 'く.らう', 'た.べる', 'は.む'],
-      'grade': 2,
-      'strokes': 9,
-      'frequency': 328,
-      'jlpt': 5,
-    });
-    expect(fields('一')['meanings'], isNot(contains('un')));
-  });
-
-  test('a search finds a kanji by its on readings in either kana and in '
-      'romaji, by whole kun readings and by its meanings; the kanji part '
-      'of a kun reading only loosely', () {
-    final eat = entry('食');
-    expect(
-      eat['keys'],
-      containsAll([
-        '食',
-        'ショク',
-        'しょく',
-        'shoku',
-        'たべる',
-        'taberu',
-        'くらう',
-        'eat',
-        'food',
-      ]),
-    );
-    expect(eat['keys'], isNot(contains('た')));
-    expect(eat['looseKeys'], containsAll(['た', 'ta', 'く', 'ku']));
-    // ひと- and ひと.つ: the suffix's dash goes, its kanji part is whole.
-    expect(entry('一')['keys'], containsAll(['ひと', 'ひとつ', 'hitotsu']));
-    expect(entry('一')['looseKeys'], isNot(contains('ひと')));
-  });
-
-  test('levels, grades and radicals label the kanji; level and grade rank '
-      'them: JLPT level, then school grade, then frequency', () {
-    expect(entry('亜')['labels'], ['jlpt:n1', 'grade:secondary', 'radical:7']);
-    // KANJIDIC2's classical radical, not Nelson's.
-    expect(entry('唖')['labels'], ['radical:30']);
-    final ranks = [
-      for (final kanji in ['一', '食', '亜', '唖']) entry(kanji)['rank']! as int,
-    ];
-    expect(ranks, orderedEquals([...ranks]..sort()));
-  });
-
-  test('a character with no Japanese reading and no English meaning is '
-      'left out', () {
-    expect(lines.skip(1).where((line) => line['id'] == '僲'), isEmpty);
-  });
-
-  test('hiragana and katakana follow, the kana table each, before every '
-      'kanji, found by their romaji', () {
-    final kana = [
-      for (final line in lines.skip(1))
-        if ((line['labels']! as List).any(['hiragana', 'katakana'].contains))
-          line,
-    ];
-    expect(kana, hasLength(142));
-    expect(kana.first['id'], 'あ');
-    expect(kana[71]['id'], 'ア');
-    expect(kana.last['id'], 'ポ');
-    expect(entry('ア')['labels'], ['katakana']);
-    expect(entry('ア')['keys'], containsAll(['ア', 'あ', 'a']));
-    expect(fields('ぢ'), {'romaji': 'ji', 'script': 'hiragana'});
-    // を is "wo" in the table, found by "o" too.
-    expect(fields('を')['romaji'], 'wo');
-    expect(entry('を')['keys'], containsAll(['wo', 'o']));
-    final lastKana = kana
-        .map((line) => line['rank']! as int)
-        .reduce((a, b) => a > b ? a : b);
-    expect(entry('食')['rank']! as int, greaterThan(lastKana));
-  });
-}