feat(dictionary): characters of Chinese, Korean and Greek, written by hand; pinyin typed

Parity with Japanese's kanji and kana:

- The characters' tab is named by its language (Hanzi, Hangul & Hanja,
  Alphabet), its groups too: HSK levels and the characters in common use
  (Hong Kong's grades for traditional ones); Hangul and the Hanja taught
  in schools; Greek's letters. Radicals for Chinese and Korean in their
  own forms (讠 for 言 in simplified Chinese), none for Greek.
- A character's readings are named as its language names them: On and
  Kun, Pinyin, Eum and Hun (음, 훈); a letter means its sound and name.
- How characters are written comes by language: Chinese from Make Me a
  Hanzi (its medians in KanjiVG's square, Arphic Public License, a data
  file beside the app, never in cards), the Hangul letters drawn by the
  curator; a Korean word is written letter by letter (닭: ㄷ ㅏ ㄺ). Words
  of alphabets (German, Greek) aren't written by hand.
- A Chinese word's pinyin is typed in a session, tone numbers turning
  into marks (ni3 → nǐ); KRDict's levels (초급, 중급, 고급) tag Korean
  words; a Korean word's pronunciation shows in brackets ([가치]).
- Smaller: Look up in the composer keeps a noun's article; the Watch
  filter names its level list; hints and placeholders by language.

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_flutter/test/support/fake_dictionary_gateway.dart

@@ -61,6 +61,82 @@ const wiktionaryDe = Dictionary(
   entryCount: 4,
 );
 
+/// Chinese words of CC-CEDICT in simplified characters.
+const ccCedictHans = Dictionary(
+  source: 'cc-cedict-hans',
+  sourceVersion: '2026-10-14',
+  kind: DictionaryKind.words,
+  language: 'zh-Hans',
+  glossLanguage: 'en',
+  license: 'CC-BY-SA-4.0',
+  credits: [
+    (
+      name: 'CC-CEDICT',
+      by: 'MDBG',
+      license: 'CC-BY-SA-4.0',
+      url: 'https://www.mdbg.net/chinese/dictionary?page=cc-cedict',
+    ),
+  ],
+  entryCount: 0,
+);
+
+/// Chinese characters of Unihan in simplified writing.
+const unihanHans = Dictionary(
+  source: 'unihan-hans',
+  sourceVersion: '18.0.0',
+  kind: DictionaryKind.characters,
+  language: 'zh-Hans',
+  glossLanguage: 'en',
+  license: 'Unicode-3.0',
+  credits: [
+    (
+      name: 'Unihan Database',
+      by: 'Unicode, Inc.',
+      license: 'Unicode-3.0',
+      url: 'https://www.unicode.org/reports/tr38/',
+    ),
+  ],
+  entryCount: 1,
+);
+
+/// Greek words with English meanings from Wiktionary.
+const wiktionaryEl = Dictionary(
+  source: 'wiktionary-el',
+  sourceVersion: '2026-10-03',
+  kind: DictionaryKind.words,
+  language: 'el',
+  glossLanguage: 'en',
+  license: 'CC-BY-SA-4.0',
+  credits: [
+    (
+      name: 'Wiktionary',
+      by: 'Wiktionary contributors',
+      license: 'CC-BY-SA-4.0',
+      url: 'https://en.wiktionary.org/wiki/Wiktionary:Copyrights',
+    ),
+  ],
+  entryCount: 0,
+);
+
+/// The Greek alphabet the curator writes.
+const greekAlphabet = Dictionary(
+  source: 'greek-alphabet',
+  sourceVersion: '1',
+  kind: DictionaryKind.characters,
+  language: 'el',
+  glossLanguage: 'en',
+  license: 'CC0-1.0',
+  credits: [
+    (
+      name: 'Alphabets (Hangul, Greek)',
+      by: 'Halkyon Learn contributors',
+      license: 'CC0-1.0',
+      url: 'https://code.halkyon.app/project-halkyon/halkyon_learn',
+    ),
+  ],
+  entryCount: 1,
+);
+
 /// A German word of Wiktionary: [headword], its part of speech [pos] in
 /// full, meaning [glosses], its [genders] and the [forms] that find it.
 DictionaryWord germanWord(
@@ -104,7 +180,8 @@ DictionaryWord word(
 );
 
 /// A KANJIDIC2 character: [headword] meaning [meanings], read [on] and
-/// [kun], with [labels]; a kana with its [romaji].
+/// [kun], with [labels]; a kana with its [romaji]; or a character [of]
+/// another dictionary of characters.
 DictionaryCharacter character(
   String headword, {
   List<String> meanings = const [],
@@ -112,11 +189,15 @@ DictionaryCharacter character(
   List<String> kun = const [],
   List<String> labels = const [],
   String? romaji,
+  String? name,
   int? grade,
   int? strokes,
   String? version,
+  Dictionary of = kanjidic,
 }) => DictionaryCharacter(
-  ref: (source: 'kanjidic', id: headword),
+  ref: (source: of.source, id: headword),
+  name: name,
+  language: of.language,
   headword: headword,
   labels: labels,
   meanings: meanings,