Implement the 022-fixed-layout-bars feature that pins turn navigation to the top and add-creature bar to the bottom of the encounter tracker with only the combatant list scrolling between them, and auto-scrolls to the active combatant on turn change

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

apps/web/src/App.tsx

@@ -1,5 +1,5 @@
 import type { Creature } from "@initiative/domain";
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 import { ActionBar } from "./components/action-bar";
 import { CombatantRow } from "./components/combatant-row";
 import { StatBlockPanel } from "./components/stat-block-panel";
@@ -64,6 +64,15 @@ export function App() {
 		[isLoaded, search],
 	);
 
+	// Auto-scroll to the active combatant when the turn changes
+	const activeRowRef = useRef<HTMLDivElement>(null);
+	useEffect(() => {
+		activeRowRef.current?.scrollIntoView({
+			block: "nearest",
+			behavior: "smooth",
+		});
+	}, [encounter.activeIndex]);
+
 	// Auto-show stat block for the active combatant when turn changes,
 	// but only when the viewport is wide enough to show it alongside the tracker
 	useEffect(() => {
@@ -77,62 +86,68 @@ export function App() {
 	}, [encounter.activeIndex, encounter.combatants, getCreature, isLoaded]);
 
 	return (
-		<div className="h-screen overflow-y-auto">
-			<div className="mx-auto flex w-full max-w-2xl flex-col gap-6 px-4 py-8">
-				{/* Header */}
-				<header className="space-y-1">
-					<h1 className="text-2xl font-bold tracking-tight">
-						Initiative Tracker
-					</h1>
-				</header>
-
-				{/* Turn Navigation */}
-				<TurnNavigation
-					encounter={encounter}
-					onAdvanceTurn={advanceTurn}
-					onRetreatTurn={retreatTurn}
-				/>
-
-				{/* Combatant List */}
-				<div className="flex flex-1 flex-col gap-1">
-					{encounter.combatants.length === 0 ? (
-						<p className="py-12 text-center text-sm text-muted-foreground">
-							No combatants yet — add one to get started
-						</p>
-					) : (
-						encounter.combatants.map((c, i) => (
-							<CombatantRow
-								key={c.id}
-								combatant={c}
-								isActive={i === encounter.activeIndex}
-								onRename={editCombatant}
-								onSetInitiative={setInitiative}
-								onRemove={removeCombatant}
-								onSetHp={setHp}
-								onAdjustHp={adjustHp}
-								onSetAc={setAc}
-								onToggleCondition={toggleCondition}
-								onToggleConcentration={toggleConcentration}
-								onShowStatBlock={
-									c.creatureId
-										? () => handleCombatantStatBlock(c.creatureId as string)
-										: undefined
-								}
-							/>
-						))
-					)}
+		<div className="flex h-screen flex-col">
+			<div className="mx-auto flex w-full max-w-2xl flex-1 flex-col gap-6 px-4 min-h-0">
+				{/* Turn Navigation — fixed at top */}
+				<div className="shrink-0 pt-8">
+					<TurnNavigation
+						encounter={encounter}
+						onAdvanceTurn={advanceTurn}
+						onRetreatTurn={retreatTurn}
+					/>
 				</div>
 
-				{/* Action Bar */}
-				<ActionBar
-					onAddCombatant={addCombatant}
-					onAddFromBestiary={handleAddFromBestiary}
-					bestiarySearch={search}
-					bestiaryLoaded={isLoaded}
-					suggestions={suggestions}
-					onSearchChange={handleSearchChange}
-					onShowStatBlock={handleShowStatBlock}
-				/>
+				{/* Scrollable area — combatant list */}
+				<div className="flex-1 overflow-y-auto min-h-0">
+					<header className="space-y-1 mb-6">
+						<h1 className="text-2xl font-bold tracking-tight">
+							Initiative Tracker
+						</h1>
+					</header>
+
+					<div className="flex flex-col gap-1 pb-2">
+						{encounter.combatants.length === 0 ? (
+							<p className="py-12 text-center text-sm text-muted-foreground">
+								No combatants yet — add one to get started
+							</p>
+						) : (
+							encounter.combatants.map((c, i) => (
+								<CombatantRow
+									key={c.id}
+									ref={i === encounter.activeIndex ? activeRowRef : null}
+									combatant={c}
+									isActive={i === encounter.activeIndex}
+									onRename={editCombatant}
+									onSetInitiative={setInitiative}
+									onRemove={removeCombatant}
+									onSetHp={setHp}
+									onAdjustHp={adjustHp}
+									onSetAc={setAc}
+									onToggleCondition={toggleCondition}
+									onToggleConcentration={toggleConcentration}
+									onShowStatBlock={
+										c.creatureId
+											? () => handleCombatantStatBlock(c.creatureId as string)
+											: undefined
+									}
+								/>
+							))
+						)}
+					</div>
+				</div>
+
+				{/* Action Bar — fixed at bottom */}
+				<div className="shrink-0 pb-8">
+					<ActionBar
+						onAddCombatant={addCombatant}
+						onAddFromBestiary={handleAddFromBestiary}
+						bestiarySearch={search}
+						bestiaryLoaded={isLoaded}
+						suggestions={suggestions}
+						onSearchChange={handleSearchChange}
+						onShowStatBlock={handleShowStatBlock}
+					/>
+				</div>
 			</div>
 
 			{/* Stat Block Panel */}