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/App.tsx

@@ -203,6 +203,15 @@ export function App() {
 	const playerCharacterRef = useRef<PlayerCharacterSectionHandle>(null);
 	const actionBarAnim = useActionBarAnimation(encounter.combatants.length);
 
+	// Auto-update stat block panel when the active combatant changes
+	const activeCreatureId =
+		encounter.combatants[encounter.activeIndex]?.creatureId;
+	useEffect(() => {
+		if (activeCreatureId && sidePanel.panelView.mode === "creature") {
+			sidePanel.showCreature(activeCreatureId);
+		}
+	}, [activeCreatureId, sidePanel.panelView.mode, sidePanel.showCreature]);
+
 	// Auto-scroll to the active combatant when the turn changes
 	const activeRowRef = useRef<HTMLDivElement>(null);
 	useEffect(() => {
@@ -282,6 +291,9 @@ export function App() {
 												? () => handleCombatantStatBlock(c.creatureId as string)
 												: undefined
 										}
+										isStatBlockOpen={
+											c.creatureId === sidePanel.selectedCreatureId
+										}
 										onRollInitiative={
 											c.creatureId ? handleRollInitiative : undefined
 										}