Improve bestiary icon UX and auto-update stat block on turn change

- Use Book/BookOpen icons to indicate stat block open state
- Bump combatant icons (bestiary + PC) from 14px to 16px
- Use text-foreground for bestiary icon visibility
- Auto-update stat block panel to active combatant's creature on turn advance
- Update bestiary spec edge case to reflect new behavior

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

apps/web/src/components/combatant-row.tsx

@@ -4,7 +4,7 @@ import {
 	deriveHpStatus,
 	type PlayerIcon,
 } from "@initiative/domain";
-import { BookOpen, Brain, X } from "lucide-react";
+import { Book, BookOpen, Brain, X } from "lucide-react";
 import { type Ref, useCallback, useEffect, useRef, useState } from "react";
 import { cn } from "../lib/utils";
 import { AcShield } from "./ac-shield";
@@ -41,6 +41,7 @@ interface CombatantRowProps {
 	onToggleCondition: (id: CombatantId, conditionId: ConditionId) => void;
 	onToggleConcentration: (id: CombatantId) => void;
 	onShowStatBlock?: () => void;
+	isStatBlockOpen?: boolean;
 	onRollInitiative?: (id: CombatantId) => void;
 }
 
@@ -396,6 +397,7 @@ export function CombatantRow({
 	onToggleCondition,
 	onToggleConcentration,
 	onShowStatBlock,
+	isStatBlockOpen,
 	onRollInitiative,
 }: CombatantRowProps & { ref?: Ref<HTMLDivElement> }) {
 	const { id, name, initiative, maxHp, currentHp } = combatant;
@@ -480,9 +482,9 @@ export function CombatantRow({
 							onClick={onShowStatBlock}
 							title="View stat block"
 							aria-label="View stat block"
-							className="shrink-0 text-muted-foreground transition-colors hover:text-hover-neutral"
+							className="shrink-0 text-foreground transition-colors hover:text-hover-neutral"
 						>
-							<BookOpen size={14} />
+							{isStatBlockOpen ? <BookOpen size={16} /> : <Book size={16} />}
 						</button>
 					)}
 					{!!combatant.icon &&
@@ -495,7 +497,7 @@ export function CombatantRow({
 								];
 							return PcIcon ? (
 								<PcIcon
-									size={14}
+									size={16}
 									style={{ color: iconColor }}
 									className="shrink-0"
 								/>