Implement the 023-clear-encounter feature that adds a clear encounter button with confirmation dialog to remove all combatants and reset round/turn counters, with the cleared state persisting across page refreshes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/persistence/encounter-storage.ts

@@ -35,6 +35,16 @@ export function loadEncounter(): Encounter | null {
 		if (typeof obj.roundNumber !== "number") return null;
 
 		const combatants = obj.combatants as unknown[];
+
+		// Handle empty encounter (cleared state) directly — createEncounter rejects empty arrays
+		if (combatants.length === 0) {
+			return {
+				combatants: [],
+				activeIndex: 0,
+				roundNumber: 1,
+			};
+		}
+
 		for (const c of combatants) {
 			if (typeof c !== "object" || c === null || Array.isArray(c)) return null;
 			const entry = c as Record<string, unknown>;