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- Advantage/Disadvantage are now toggle modes (rollStore.mode) applied to d20 rolls everywhere (dice page, sheet skills/saves/attacks), preserving modifiers; applyRollMode() rewrites the first d20 -> 2d20kh1/kl1 - addCombatant auto-numbers duplicate names (Goblin 1, Goblin 2, …); the first duplicate also renames the original. Quantity add relies on this. - Tests for applyRollMode + duplicate numbering Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>