Add advantage/disadvantage rolling for initiative

Right-click or long-press the d20 button (per-combatant or Roll All)
to open a context menu with Advantage and Disadvantage options.
Normal left-click behavior is unchanged.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/application/src/roll-all-initiative-use-case.ts

@@ -5,7 +5,9 @@ import {
 	type DomainError,
 	type DomainEvent,
 	isDomainError,
+	type RollMode,
 	rollInitiative,
+	selectRoll,
 	setInitiative,
 } from "@initiative/domain";
 import type { EncounterStore } from "./ports.js";
@@ -19,6 +21,7 @@ export function rollAllInitiativeUseCase(
 	store: EncounterStore,
 	rollDice: () => number,
 	getCreature: (id: CreatureId) => Creature | undefined,
+	mode: RollMode = "normal",
 ): RollAllResult | DomainError {
 	let encounter = store.get();
 	const allEvents: DomainEvent[] = [];
@@ -39,7 +42,10 @@ export function rollAllInitiativeUseCase(
 			cr: creature.cr,
 			initiativeProficiency: creature.initiativeProficiency,
 		});
-		const value = rollInitiative(rollDice(), modifier);
+		const roll1 = rollDice();
+		const effectiveRoll =
+			mode === "normal" ? roll1 : selectRoll(roll1, rollDice(), mode);
+		const value = rollInitiative(effectiveRoll, modifier);
 
 		if (isDomainError(value)) {
 			return value;