diff --git a/apps/web/src/__tests__/app-integration.test.tsx b/apps/web/src/__tests__/app-integration.test.tsx
new file mode 100644
index 0000000..7832a35
--- /dev/null
+++ b/apps/web/src/__tests__/app-integration.test.tsx
@@ -0,0 +1,163 @@
+// @vitest-environment jsdom
+import "@testing-library/jest-dom/vitest";
+
+import { cleanup, render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { afterEach, beforeAll, describe, expect, it, vi } from "vitest";
+import { App } from "../App";
+
+// Mock persistence — no localStorage interaction
+vi.mock("../persistence/encounter-storage.js", () => ({
+	loadEncounter: () => null,
+	saveEncounter: () => {},
+}));
+
+vi.mock("../persistence/player-character-storage.js", () => ({
+	loadPlayerCharacters: () => [],
+	savePlayerCharacters: () => {},
+}));
+
+// Mock bestiary — no IndexedDB or JSON index
+vi.mock("../adapters/bestiary-cache.js", () => ({
+	loadAllCachedCreatures: () => Promise.resolve(new Map()),
+	isSourceCached: () => Promise.resolve(false),
+	cacheSource: () => Promise.resolve(),
+	getCachedSources: () => Promise.resolve([]),
+	clearSource: () => Promise.resolve(),
+	clearAll: () => Promise.resolve(),
+}));
+
+vi.mock("../adapters/bestiary-index-adapter.js", () => ({
+	loadBestiaryIndex: () => ({ sources: {}, creatures: [] }),
+	getAllSourceCodes: () => [],
+	getDefaultFetchUrl: () => "",
+	getSourceDisplayName: (code: string) => code,
+}));
+
+// DOM API stubs — jsdom doesn't implement these
+beforeAll(() => {
+	Object.defineProperty(globalThis, "matchMedia", {
+		writable: true,
+		value: vi.fn().mockImplementation((query: string) => ({
+			matches: false,
+			media: query,
+			onchange: null,
+			addListener: vi.fn(),
+			removeListener: vi.fn(),
+			addEventListener: vi.fn(),
+			removeEventListener: vi.fn(),
+			dispatchEvent: vi.fn(),
+		})),
+	});
+	Element.prototype.scrollIntoView = vi.fn();
+});
+
+afterEach(cleanup);
+
+async function addCombatant(
+	user: ReturnType<typeof userEvent.setup>,
+	name: string,
+	opts?: { maxHp?: string },
+) {
+	const inputs = screen.getAllByPlaceholderText("+ Add combatants");
+	// biome-ignore lint/style/noNonNullAssertion: getAllBy always returns at least one
+	const input = inputs.at(-1)!;
+	await user.type(input, name);
+
+	if (opts?.maxHp) {
+		const maxHpInput = screen.getByPlaceholderText("MaxHP");
+		await user.type(maxHpInput, opts.maxHp);
+	}
+
+	const addButton = screen.getByRole("button", { name: "Add" });
+	await user.click(addButton);
+}
+
+describe("App integration", () => {
+	it("adds a combatant and removes it, returning to empty state", async () => {
+		const user = userEvent.setup();
+		render(<App />);
+
+		// Empty state: centered input visible, no TurnNavigation
+		expect(screen.getByPlaceholderText("+ Add combatants")).toBeInTheDocument();
+		expect(screen.queryByText("R1")).not.toBeInTheDocument();
+
+		// Add a combatant
+		await addCombatant(user, "Goblin");
+
+		// Verify combatant appears and TurnNavigation shows
+		expect(screen.getByRole("button", { name: "Goblin" })).toBeInTheDocument();
+		expect(screen.getByText("R1")).toBeInTheDocument();
+		expect(screen.getAllByText("Goblin").length).toBeGreaterThanOrEqual(2);
+
+		// Remove combatant via ConfirmButton (two clicks)
+		const removeBtn = screen.getByRole("button", {
+			name: "Remove combatant",
+		});
+		await user.click(removeBtn);
+		const confirmBtn = screen.getByRole("button", {
+			name: "Confirm remove combatant",
+		});
+		await user.click(confirmBtn);
+
+		// Back to empty state (R1 badge may linger due to exit animation in jsdom)
+		expect(
+			screen.queryByRole("button", { name: "Goblin" }),
+		).not.toBeInTheDocument();
+		expect(screen.getByPlaceholderText("+ Add combatants")).toBeInTheDocument();
+	});
+
+	it("advances and retreats turns across two combatants", async () => {
+		const user = userEvent.setup();
+		render(<App />);
+
+		await addCombatant(user, "Fighter");
+		await addCombatant(user, "Wizard");
+
+		// Initial state — R1, Fighter active (Previous turn disabled)
+		expect(screen.getByText("R1")).toBeInTheDocument();
+		expect(
+			screen.getByRole("button", { name: "Previous turn" }),
+		).toBeDisabled();
+
+		// Advance turn — Wizard becomes active
+		await user.click(screen.getByRole("button", { name: "Next turn" }));
+		expect(screen.getByText("R1")).toBeInTheDocument();
+		expect(screen.getByRole("button", { name: "Previous turn" })).toBeEnabled();
+
+		// Advance again — wraps to R2, Fighter active
+		await user.click(screen.getByRole("button", { name: "Next turn" }));
+		expect(screen.getByText("R2")).toBeInTheDocument();
+		expect(screen.getByRole("button", { name: "Previous turn" })).toBeEnabled();
+
+		// Retreat — back to R1, Wizard active
+		await user.click(screen.getByRole("button", { name: "Previous turn" }));
+		expect(screen.getByText("R1")).toBeInTheDocument();
+	});
+
+	it("adds a combatant with HP, applies damage, and shows unconscious state", async () => {
+		const user = userEvent.setup();
+		render(<App />);
+
+		await addCombatant(user, "Ogre", { maxHp: "59" });
+
+		// Verify HP displays — currentHp and maxHp both show "59"
+		expect(screen.getByText("/")).toBeInTheDocument();
+		const hpButton = screen.getByRole("button", {
+			name: "Current HP: 59 (healthy)",
+		});
+		expect(hpButton).toBeInTheDocument();
+
+		// Click currentHp to open HpAdjustPopover, apply full damage
+		await user.click(hpButton);
+		const hpInput = screen.getByPlaceholderText("HP");
+		expect(hpInput).toBeInTheDocument();
+		await user.type(hpInput, "59");
+		await user.click(screen.getByRole("button", { name: "Apply damage" }));
+
+		// Verify HP decreased to 0 and unconscious state
+		expect(
+			screen.getByRole("button", { name: "Current HP: 0 (unconscious)" }),
+		).toBeInTheDocument();
+	});
+});
diff --git a/apps/web/src/components/combatant-row.tsx b/apps/web/src/components/combatant-row.tsx
index a27ffda..7898f9a 100644
--- a/apps/web/src/components/combatant-row.tsx
+++ b/apps/web/src/components/combatant-row.tsx
@@ -244,6 +244,7 @@ function ClickableHp({
 			<button
 				type="button"
 				onClick={() => setPopoverOpen(true)}
+				aria-label={`Current HP: ${currentHp} (${status})`}
 				className={cn(
 					"inline-block h-7 min-w-[3ch] text-center font-medium text-sm tabular-nums leading-7 transition-colors hover:text-hover-neutral",
 					status === "bloodied" && "text-amber-400",