fix: show dice in spell cast card, dedupe Alchemy folders, assign signature spells

- Spell cast card now embeds the TS dice (base + overcast) and damage dice
  instead of posting separate roll messages; Dice So Nice still animates.
- Spell pack Alchemy sub-folders renamed to Transmutacja / Warzenie Eliksirów
  so the label no longer repeats under the Alchemia folder.
- Discipline schema gains signatureSpells (the sheet already bound to it);
  build-packs fills it with each discipline's own spells.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

scripts/generate-babele-translations.ts

@@ -146,6 +146,8 @@ const folderNameTranslations: Record<string, string> = {
   "Magia Ziemi": "Earth Magic",
   "Alchemia": "Alchemy",
   "Alchemia - Transmutacja": "Alchemy - Transmutation",
+  "Transmutacja": "Transmutation",
+  "Warzenie Eliksirów": "Brewing of Elixirs",
   "Alchemia - Warzenie Eliksirów": "Alchemy - Brewing of Elixirs",
   "Rzemiosło Artefaktów": "Crafting of Artifacts",
   "Golemancja": "Golemancy",