feat(app): show and write a word's senses with their grammar

A word with senses (as a dictionary gives them) shows them when its
answer shows: numbered when there are several, each with its label, its
translations and its grammar codes, small and slanted, their meaning on
hover. A word usually written in kana shows its reading from the start:
its kanji are rarely seen, so there is nothing to hide. The composer
writes the senses' translations, adds and removes senses, and keeps the
codes as they came.

The codes' short forms and meanings are the dictionary's own English
(JMdict's entities), kept as data beside the cards.

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/lib/l10n/app_de.arb

@@ -449,6 +449,11 @@
   "vocabularyMeaningHint": "Bedeutung",
   "vocabularyAddMeaning": "Bedeutung hinzufügen",
   "vocabularyRemoveMeaning": "Bedeutung entfernen",
+  "vocabularyGlossHint": "Übersetzung",
+  "vocabularyAddGloss": "Übersetzung hinzufügen",
+  "vocabularyRemoveGloss": "Übersetzung entfernen",
+  "vocabularyAddSense": "Wortbedeutung hinzufügen",
+  "vocabularyRemoveSense": "Wortbedeutung entfernen",
   "matchingCategories": "Kategorien",
   "matchingCategoriesHint": "Die Ablagekarten, auf die Lernende Elemente ziehen. Jede Kategorie braucht mindestens ein Element, daher kann eine Karte nicht mehr Kategorien als Elemente haben.",
   "matchingCategory": "Kategorie {number}",