feat(lobby): F8-04b hierarchical sidebar + paid-tier gate for create-game

Reshape the lobby UI from a single Overview into a two-level sidebar
(games · profile · DEV synthetic-reports) with four games sub-panels
(active-past · recruitment · invitations · private-games). Move the
`create new game` button into the private-games panel, merge the
applications section into recruitment cards as status chips, and add
DEV-only synthetic-report loader as a top-level screen.

Add a paid-tier gate at backend `lobby.game.create`: free callers get
`403 forbidden` before the lobby service is invoked. The UI hides the
private-games sub-panel + create button on free tier (DEV affordances
flag overrides). Update every integration test that creates a game to
use a new `testenv.PromoteToPaid` helper; add a new
`TestLobbyFlow_FreeUserCreateGameForbidden`.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/frontend/src/lib/app-nav.svelte.ts

@@ -22,7 +22,43 @@
 
 import { pushState, replaceState } from "$app/navigation";
 
-export type AppScreen = "login" | "lobby" | "lobby-create" | "profile" | "game";
+// Top-level app-shell screens. The lobby is split into per-page screens
+// (F8-04b): `lobby` is the bare alias the shell resolves to the first
+// visible games sub-page; the explicit `games-*` literals point at one
+// of the four lobby sub-panels; `synthetic-reports` is the DEV-only
+// reports screen (build-time gated via VITE_GALAXY_DEV_AFFORDANCES).
+// `lobby-create` and `profile` remain as separate top-level screens.
+export type AppScreen =
+	| "login"
+	| "lobby"
+	| "lobby-create"
+	| "profile"
+	| "game"
+	| "games-active-past"
+	| "games-recruitment"
+	| "games-invitations"
+	| "games-private-games"
+	| "synthetic-reports";
+
+// LOBBY_SUB_SCREENS lists the AppScreen literals that the sidebar
+// renders as members of the `games` submenu. The order is the canonical
+// "first-visible" order: when the user clicks the `games` header (or
+// the screen state is the bare `lobby` alias) the shell picks the
+// first entry whose visibility predicate holds.
+export const LOBBY_SUB_SCREENS: readonly AppScreen[] = [
+	"games-active-past",
+	"games-recruitment",
+	"games-invitations",
+	"games-private-games",
+];
+
+// isLobbySubScreen returns true when screen identifies one of the
+// `games-*` sub-panels — useful for the sidebar to highlight the
+// `games` parent and to decide whether the desktop submenu should be
+// rendered expanded.
+export function isLobbySubScreen(screen: AppScreen): boolean {
+	return LOBBY_SUB_SCREENS.includes(screen);
+}
 
 export type GameView =
 	| "map"
@@ -53,6 +89,11 @@ const APP_SCREENS: readonly AppScreen[] = [
 	"lobby-create",
 	"profile",
 	"game",
+	"games-active-past",
+	"games-recruitment",
+	"games-invitations",
+	"games-private-games",
+	"synthetic-reports",
 ];
 const GAME_VIEWS: readonly GameView[] = [
 	"map",

ui/frontend/src/lib/i18n/locales/en.ts

@@ -55,16 +55,31 @@ const en = {
 	"lobby.nav.aria_label": "lobby pages",
 	"lobby.nav.overview": "Overview",
 	"lobby.nav.profile": "Profile",
+	"lobby.nav.games": "games",
+	"lobby.nav.games.active_past": "active & past",
+	"lobby.nav.games.recruitment": "recruitment",
+	"lobby.nav.games.invitations": "invitations",
+	"lobby.nav.games.private_games": "private games",
+	"lobby.nav.games.aria_label": "games sections",
+	"lobby.nav.games.mobile_toggle": "games · {label}",
+	"lobby.nav.synthetic_reports": "Synthetic test reports",
 	"lobby.section.my_games": "my games",
 	"lobby.section.invitations": "pending invitations",
 	"lobby.section.applications": "my applications",
 	"lobby.section.public_games": "public games",
+	"lobby.section.recruitment": "open recruitment",
+	"lobby.section.private_games": "my private games",
 	"lobby.section.create": "create a game",
 	"lobby.create_button": "create new game",
 	"lobby.my_games.empty": "no games yet",
 	"lobby.invitations.empty": "no invitations",
 	"lobby.applications.empty": "no applications",
 	"lobby.public_games.empty": "no public games",
+	"lobby.games.active_past.empty": "no active or past games",
+	"lobby.games.private_games.empty": "no private games yet",
+	"lobby.recruitment.empty": "no open recruitment",
+	"lobby.recruitment.applied_pending": "your application is awaiting approval",
+	"lobby.recruitment.applied_approved": "your application was accepted",
 	"lobby.invitation.accept": "accept",
 	"lobby.invitation.decline": "decline",
 	"lobby.application.submit": "submit application",
@@ -96,6 +111,8 @@ const en = {
 	"lobby.create.game_name_required": "game name must not be empty",
 	"lobby.create.turn_schedule_required": "turn schedule must not be empty",
 	"lobby.create.enrollment_ends_at_required": "enrollment end time must be set",
+	"lobby.create.error.forbidden":
+		"Game creation is available only on a paid plan.",
 	"lobby.error.invalid_request": "request is invalid",
 	"lobby.error.subject_not_found": "not found",
 	"lobby.error.forbidden": "operation is forbidden",

ui/frontend/src/lib/i18n/locales/ru.ts

@@ -56,16 +56,31 @@ const ru: Record<keyof typeof en, string> = {
 	"lobby.nav.aria_label": "разделы лобби",
 	"lobby.nav.overview": "Обзор",
 	"lobby.nav.profile": "Профиль",
+	"lobby.nav.games": "партии",
+	"lobby.nav.games.active_past": "активные и прошедшие",
+	"lobby.nav.games.recruitment": "набор",
+	"lobby.nav.games.invitations": "приглашения",
+	"lobby.nav.games.private_games": "приватные партии",
+	"lobby.nav.games.aria_label": "подразделы партий",
+	"lobby.nav.games.mobile_toggle": "партии · {label}",
+	"lobby.nav.synthetic_reports": "Synthetic-отчёты",
 	"lobby.section.my_games": "мои игры",
 	"lobby.section.invitations": "ожидающие приглашения",
 	"lobby.section.applications": "мои заявки",
 	"lobby.section.public_games": "публичные игры",
+	"lobby.section.recruitment": "открытый набор",
+	"lobby.section.private_games": "мои приватные партии",
 	"lobby.section.create": "создать игру",
 	"lobby.create_button": "создать новую игру",
 	"lobby.my_games.empty": "пока нет игр",
 	"lobby.invitations.empty": "приглашений нет",
 	"lobby.applications.empty": "заявок нет",
 	"lobby.public_games.empty": "публичных игр нет",
+	"lobby.games.active_past.empty": "нет активных или прошедших партий",
+	"lobby.games.private_games.empty": "у вас нет собственных партий",
+	"lobby.recruitment.empty": "набор в партии ещё не открыт",
+	"lobby.recruitment.applied_pending": "ваша заявка ожидает одобрения",
+	"lobby.recruitment.applied_approved": "ваша заявка принята",
 	"lobby.invitation.accept": "принять",
 	"lobby.invitation.decline": "отклонить",
 	"lobby.application.submit": "подать заявку",
@@ -97,6 +112,8 @@ const ru: Record<keyof typeof en, string> = {
 	"lobby.create.game_name_required": "название игры не должно быть пустым",
 	"lobby.create.turn_schedule_required": "расписание ходов не должно быть пустым",
 	"lobby.create.enrollment_ends_at_required": "время окончания набора обязательно",
+	"lobby.create.error.forbidden":
+		"Создание партий доступно только на платном тарифе.",
 	"lobby.error.invalid_request": "запрос некорректен",
 	"lobby.error.subject_not_found": "объект не найден",
 	"lobby.error.forbidden": "операция запрещена",

ui/frontend/src/lib/lobby-data.svelte.ts

@@ -0,0 +1,177 @@
+// LobbyDataStore is the session-wide cache for the four lobby panels
+// (active-past / recruitment / invitations / private-games). It owns the
+// GalaxyClient instance used by lobby HTTP commands, the result of the
+// `lobby.*.list` fan-out, and the loading / error flags every panel
+// reads. Sub-screens that need to mutate (submit application, redeem
+// invite) go through the store so the optimistic state stays consistent
+// across navigations.
+//
+// The store is built around F8-04b's split of the old single
+// `lobby-screen.svelte` into per-panel screens — the prior design fetched
+// everything on every panel mount, and refetching on each navigation
+// flash-cleared the UI. A singleton with $state runes keeps the four
+// lists alive while the user moves between subpages.
+//
+// `clear()` resets the store on signOut; the matching plumbing lives in
+// `session-store.svelte.ts::signOut`.
+
+import { createGatewayClient } from "../api/connect";
+import { GalaxyClient } from "../api/galaxy-client";
+import {
+	LobbyError,
+	listMyApplications,
+	listMyGames,
+	listMyInvites,
+	listPublicGames,
+	type ApplicationSummary,
+	type GameSummary,
+	type InviteSummary,
+} from "../api/lobby";
+import { gatewayRpcBaseUrl, GATEWAY_RESPONSE_PUBLIC_KEY } from "./env";
+import { i18n, type TranslationKey } from "./i18n/index.svelte";
+import { loadCore } from "../platform/core/index";
+import { session } from "./session-store.svelte";
+
+async function sha256(payload: Uint8Array): Promise<Uint8Array> {
+	const digest = await crypto.subtle.digest("SHA-256", payload as BufferSource);
+	return new Uint8Array(digest);
+}
+
+export function describeLobbyError(err: unknown): string {
+	if (err instanceof LobbyError) {
+		const key = `lobby.error.${err.code}` as TranslationKey;
+		const translated = i18n.t(key);
+		if (translated !== key) {
+			return translated;
+		}
+		return i18n.t("lobby.error.unknown", { message: err.message });
+	}
+	return err instanceof Error ? err.message : "request failed";
+}
+
+class LobbyDataStore {
+	myGames = $state<GameSummary[]>([]);
+	invitations = $state<InviteSummary[]>([]);
+	applications = $state<ApplicationSummary[]>([]);
+	publicGames = $state<GameSummary[]>([]);
+	loading = $state(true);
+	error: string | null = $state(null);
+	configError: string | null = $state(null);
+
+	#client: GalaxyClient | null = null;
+	#bootstrap: Promise<GalaxyClient | null> | null = null;
+	#refresh: Promise<void> | null = null;
+
+	get client(): GalaxyClient | null {
+		return this.#client;
+	}
+
+	// ensure resolves to the cached GalaxyClient, building one on first
+	// call and triggering the initial `lobby.*.list` fan-out. Concurrent
+	// callers from sibling screens share the same in-flight bootstrap.
+	ensure(): Promise<GalaxyClient | null> {
+		if (this.#client !== null) {
+			return Promise.resolve(this.#client);
+		}
+		if (this.#bootstrap !== null) {
+			return this.#bootstrap;
+		}
+		this.#bootstrap = this.#bootstrapClient();
+		return this.#bootstrap;
+	}
+
+	async #bootstrapClient(): Promise<GalaxyClient | null> {
+		try {
+			if (
+				session.keypair === null ||
+				session.deviceSessionId === null ||
+				GATEWAY_RESPONSE_PUBLIC_KEY.length === 0
+			) {
+				this.loading = false;
+				if (GATEWAY_RESPONSE_PUBLIC_KEY.length === 0) {
+					this.configError = "VITE_GATEWAY_RESPONSE_PUBLIC_KEY is not configured";
+				}
+				return null;
+			}
+			const keypair = session.keypair;
+			const core = await loadCore();
+			this.#client = new GalaxyClient({
+				core,
+				edge: createGatewayClient(gatewayRpcBaseUrl()),
+				signer: (canonical) => keypair.sign(canonical),
+				sha256,
+				deviceSessionId: session.deviceSessionId,
+				gatewayResponsePublicKey: GATEWAY_RESPONSE_PUBLIC_KEY,
+			});
+			await this.refresh();
+			return this.#client;
+		} catch (err) {
+			this.error = describeLobbyError(err);
+			this.loading = false;
+			return null;
+		} finally {
+			this.#bootstrap = null;
+		}
+	}
+
+	// refresh re-runs the four `lobby.*.list` fan-out. Concurrent callers
+	// share the same in-flight promise.
+	refresh(): Promise<void> {
+		if (this.#client === null) {
+			return Promise.resolve();
+		}
+		if (this.#refresh !== null) {
+			return this.#refresh;
+		}
+		const client = this.#client;
+		this.loading = true;
+		this.error = null;
+		this.#refresh = (async () => {
+			try {
+				const [games, invites, apps, publicPage] = await Promise.all([
+					listMyGames(client),
+					listMyInvites(client),
+					listMyApplications(client),
+					listPublicGames(client),
+				]);
+				this.myGames = games;
+				this.invitations = invites.filter((invite) => invite.status === "pending");
+				this.applications = apps;
+				this.publicGames = publicPage.items;
+			} catch (err) {
+				this.error = describeLobbyError(err);
+			} finally {
+				this.loading = false;
+				this.#refresh = null;
+			}
+		})();
+		return this.#refresh;
+	}
+
+	prependApplication(app: ApplicationSummary): void {
+		this.applications = [app, ...this.applications];
+	}
+
+	removeInvitation(inviteId: string): void {
+		this.invitations = this.invitations.filter((i) => i.inviteId !== inviteId);
+	}
+
+	setMyGames(games: GameSummary[]): void {
+		this.myGames = games;
+	}
+
+	clear(): void {
+		this.#client = null;
+		this.#bootstrap = null;
+		this.#refresh = null;
+		this.myGames = [];
+		this.invitations = [];
+		this.applications = [];
+		this.publicGames = [];
+		this.loading = true;
+		this.error = null;
+		this.configError = null;
+	}
+}
+
+export const lobbyData = new LobbyDataStore();

ui/frontend/src/lib/screens/games-active-past-screen.svelte

@@ -0,0 +1,111 @@
+<!--
+Active & past games panel for the lobby `games` section. Lists every
+game where the caller is a member, regardless of lifecycle status.
+Statuses that have no navigable in-game view (draft / enrollment_open /
+starting / cancelled / start_failed) render as disabled cards.
+
+The shell hides this submenu item entirely when the player has no games,
+so the empty-state text below is reached only in the narrow window
+where the shell mounts before the lobby-data fan-out resolves.
+-->
+<script lang="ts">
+	import { onMount } from "svelte";
+	import { appScreen, activeView } from "$lib/app-nav.svelte";
+	import { account } from "$lib/account-store.svelte";
+	import { i18n } from "$lib/i18n/index.svelte";
+	import { lobbyData } from "$lib/lobby-data.svelte";
+	import LobbyShell from "./lobby-shell.svelte";
+
+	onMount(() => {
+		lobbyData.ensure().then((client) => {
+			if (client !== null) {
+				account.ensure(client).catch(() => {});
+			}
+		});
+	});
+
+	function isPlayableStatus(status: string): boolean {
+		return status === "running" || status === "paused" || status === "finished";
+	}
+
+	function gotoGame(gameId: string): void {
+		activeView.reset();
+		appScreen.go("game", { gameId });
+	}
+</script>
+
+<LobbyShell>
+	{#if lobbyData.configError !== null}
+		<p role="alert" data-testid="account-error">{lobbyData.configError}</p>
+	{:else if lobbyData.error !== null}
+		<p role="alert" data-testid="lobby-error">{lobbyData.error}</p>
+	{/if}
+
+	<section data-testid="lobby-games-active-past-section">
+		<h2>{i18n.t("lobby.section.my_games")}</h2>
+		{#if lobbyData.loading}
+			<p role="status">{i18n.t("lobby.list_loading")}</p>
+		{:else if lobbyData.myGames.length === 0}
+			<p data-testid="lobby-games-active-past-empty">
+				{i18n.t("lobby.games.active_past.empty")}
+			</p>
+		{:else}
+			<ul class="card-list">
+				{#each lobbyData.myGames as game (game.gameId)}
+					<li>
+						<button
+							class="card"
+							onclick={() => gotoGame(game.gameId)}
+							disabled={!isPlayableStatus(game.status)}
+							data-testid="lobby-my-game-card"
+						>
+							<strong>{game.gameName}</strong>
+							<span class="meta">{game.status}</span>
+							<span class="meta">{game.minPlayers}–{game.maxPlayers} players</span>
+						</button>
+					</li>
+				{/each}
+			</ul>
+		{/if}
+	</section>
+</LobbyShell>
+
+<style>
+	section {
+		margin-bottom: var(--space-6);
+	}
+	section h2 {
+		font-size: var(--text-lg);
+		margin: 0 0 var(--space-3);
+	}
+	.card-list {
+		list-style: none;
+		padding: 0;
+		margin: 0;
+		display: flex;
+		flex-direction: column;
+		gap: var(--space-2);
+	}
+	.card {
+		display: flex;
+		flex-direction: column;
+		gap: var(--space-1);
+		padding: var(--space-3);
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-md);
+		background: var(--color-surface-raised);
+		text-align: left;
+		font: inherit;
+		cursor: pointer;
+		width: 100%;
+	}
+	button.card:disabled {
+		cursor: not-allowed;
+		color: var(--color-text-faint);
+		background: var(--color-surface);
+	}
+	.meta {
+		color: var(--color-text-muted);
+		font-size: var(--text-sm);
+	}
+</style>

ui/frontend/src/lib/screens/games-invitations-screen.svelte

@@ -0,0 +1,127 @@
+<!--
+Pending invitations panel for the lobby `games` section. Surfaces
+user-bound invites that have not been redeemed or declined yet, with
+accept / decline actions. Accepted invites move the inviting game into
+`active-past`; declined invites disappear from the list.
+-->
+<script lang="ts">
+	import { onMount } from "svelte";
+	import { account } from "$lib/account-store.svelte";
+	import { i18n } from "$lib/i18n/index.svelte";
+	import { lobbyData, describeLobbyError } from "$lib/lobby-data.svelte";
+	import LobbyShell from "./lobby-shell.svelte";
+	import {
+		declineInvite,
+		listMyGames,
+		redeemInvite,
+		type InviteSummary,
+	} from "../../api/lobby";
+
+	let actionInFlight = $state<string | null>(null);
+	let actionError = $state<string | null>(null);
+
+	onMount(() => {
+		lobbyData.ensure().then((client) => {
+			if (client !== null) {
+				account.ensure(client).catch(() => {});
+			}
+		});
+	});
+
+	async function acceptInvite(invite: InviteSummary): Promise<void> {
+		const client = lobbyData.client;
+		if (client === null) return;
+		actionInFlight = invite.inviteId;
+		actionError = null;
+		try {
+			await redeemInvite(client, invite.gameId, invite.inviteId);
+			lobbyData.removeInvitation(invite.inviteId);
+			lobbyData.setMyGames(await listMyGames(client));
+		} catch (err) {
+			actionError = describeLobbyError(err);
+		} finally {
+			actionInFlight = null;
+		}
+	}
+
+	async function rejectInvite(invite: InviteSummary): Promise<void> {
+		const client = lobbyData.client;
+		if (client === null) return;
+		actionInFlight = invite.inviteId;
+		actionError = null;
+		try {
+			await declineInvite(client, invite.gameId, invite.inviteId);
+			lobbyData.removeInvitation(invite.inviteId);
+		} catch (err) {
+			actionError = describeLobbyError(err);
+		} finally {
+			actionInFlight = null;
+		}
+	}
+</script>
+
+<LobbyShell>
+	{#if lobbyData.configError !== null}
+		<p role="alert" data-testid="account-error">{lobbyData.configError}</p>
+	{:else if lobbyData.error !== null}
+		<p role="alert" data-testid="lobby-error">{lobbyData.error}</p>
+	{/if}
+
+	{#if actionError !== null}
+		<p role="alert" data-testid="lobby-invitation-error">{actionError}</p>
+	{/if}
+
+	<section data-testid="lobby-games-invitations-section">
+		<h2>{i18n.t("lobby.section.invitations")}</h2>
+		{#if lobbyData.loading}
+			<p role="status">{i18n.t("lobby.list_loading")}</p>
+		{:else if lobbyData.invitations.length === 0}
+			<p data-testid="lobby-invitations-empty">{i18n.t("lobby.invitations.empty")}</p>
+		{:else}
+			<ul class="card-list">
+				{#each lobbyData.invitations as invite (invite.inviteId)}
+					<li class="card">
+						<strong>{invite.raceName}</strong>
+						<span class="meta">{invite.gameId}</span>
+						<div class="actions">
+							<button
+								onclick={() => acceptInvite(invite)}
+								disabled={actionInFlight === invite.inviteId}
+								data-testid="lobby-invite-accept"
+							>
+								{i18n.t("lobby.invitation.accept")}
+							</button>
+							<button
+								onclick={() => rejectInvite(invite)}
+								disabled={actionInFlight === invite.inviteId}
+								data-testid="lobby-invite-decline"
+							>
+								{i18n.t("lobby.invitation.decline")}
+							</button>
+						</div>
+					</li>
+				{/each}
+			</ul>
+		{/if}
+	</section>
+</LobbyShell>
+
+<style>
+	section { margin-bottom: var(--space-6); }
+	section h2 { font-size: var(--text-lg); margin: 0 0 var(--space-3); }
+	.card-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-2); }
+	.card {
+		display: flex;
+		flex-direction: column;
+		gap: var(--space-1);
+		padding: var(--space-3);
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-md);
+		background: var(--color-surface-raised);
+		text-align: left;
+		font: inherit;
+		width: 100%;
+	}
+	.meta { color: var(--color-text-muted); font-size: var(--text-sm); }
+	.actions { display: flex; gap: var(--space-2); margin-top: var(--space-1); }
+</style>

ui/frontend/src/lib/screens/games-private-games-screen.svelte

@@ -0,0 +1,137 @@
+<!--
+Private games panel for the lobby `games` section. Filters
+`lobby.my.games.list` down to games where the caller is the owner and
+the visibility is `private`. The right-hand corner of the panel hosts
+the "create new game" button that opens `lobby-create`.
+
+This subpage is gated by paid-tier visibility (the shell hides the
+sidebar entry on free-tier; the backend also rejects
+`lobby.game.create` with `403 forbidden` for free callers). The
+`VITE_GALAXY_DEV_AFFORDANCES` flag is the DEV bypass — the shell
+keeps the entry visible so the owner can exercise both paths from a
+single test account.
+-->
+<script lang="ts">
+	import { onMount } from "svelte";
+	import { appScreen, activeView } from "$lib/app-nav.svelte";
+	import { account } from "$lib/account-store.svelte";
+	import { i18n } from "$lib/i18n/index.svelte";
+	import { lobbyData } from "$lib/lobby-data.svelte";
+	import LobbyShell from "./lobby-shell.svelte";
+
+	onMount(() => {
+		lobbyData.ensure().then((client) => {
+			if (client !== null) {
+				account.ensure(client).catch(() => {});
+			}
+		});
+	});
+
+	function isPlayableStatus(status: string): boolean {
+		return status === "running" || status === "paused" || status === "finished";
+	}
+
+	function gotoGame(gameId: string): void {
+		activeView.reset();
+		appScreen.go("game", { gameId });
+	}
+
+	function gotoCreate(): void {
+		appScreen.go("lobby-create");
+	}
+
+	let privateGames = $derived.by(() => {
+		const me = account.current?.userId ?? "";
+		return lobbyData.myGames.filter(
+			(g) => g.ownerUserId === me && g.gameType === "private",
+		);
+	});
+</script>
+
+<LobbyShell>
+	{#if lobbyData.configError !== null}
+		<p role="alert" data-testid="account-error">{lobbyData.configError}</p>
+	{:else if lobbyData.error !== null}
+		<p role="alert" data-testid="lobby-error">{lobbyData.error}</p>
+	{/if}
+
+	<section data-testid="lobby-games-private-section">
+		<header class="section-header">
+			<h2>{i18n.t("lobby.section.private_games")}</h2>
+			<button
+				type="button"
+				class="create-button"
+				onclick={gotoCreate}
+				data-testid="lobby-create-button"
+			>
+				{i18n.t("lobby.create_button")}
+			</button>
+		</header>
+		{#if lobbyData.loading}
+			<p role="status">{i18n.t("lobby.list_loading")}</p>
+		{:else if privateGames.length === 0}
+			<p data-testid="lobby-games-private-empty">
+				{i18n.t("lobby.games.private_games.empty")}
+			</p>
+		{:else}
+			<ul class="card-list">
+				{#each privateGames as game (game.gameId)}
+					<li>
+						<button
+							class="card"
+							onclick={() => gotoGame(game.gameId)}
+							disabled={!isPlayableStatus(game.status)}
+							data-testid="lobby-private-game-card"
+						>
+							<strong>{game.gameName}</strong>
+							<span class="meta">{game.status}</span>
+							<span class="meta">{game.minPlayers}–{game.maxPlayers} players</span>
+						</button>
+					</li>
+				{/each}
+			</ul>
+		{/if}
+	</section>
+</LobbyShell>
+
+<style>
+	section { margin-bottom: var(--space-6); }
+	section h2 { font-size: var(--text-lg); margin: 0; }
+	.section-header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: var(--space-3);
+		margin-bottom: var(--space-3);
+	}
+	.create-button {
+		font: inherit;
+		font-size: var(--text-sm);
+		padding: var(--space-1) var(--space-3);
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-sm);
+		background: var(--color-surface-raised);
+		cursor: pointer;
+	}
+	.create-button:hover { background: var(--color-surface-hover); }
+	.card-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-2); }
+	.card {
+		display: flex;
+		flex-direction: column;
+		gap: var(--space-1);
+		padding: var(--space-3);
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-md);
+		background: var(--color-surface-raised);
+		text-align: left;
+		font: inherit;
+		cursor: pointer;
+		width: 100%;
+	}
+	button.card:disabled {
+		cursor: not-allowed;
+		color: var(--color-text-faint);
+		background: var(--color-surface);
+	}
+	.meta { color: var(--color-text-muted); font-size: var(--text-sm); }
+</style>

ui/frontend/src/lib/screens/games-recruitment-screen.svelte

@@ -0,0 +1,291 @@
+<!--
+Recruitment panel for the lobby `games` section. Surfaces every public
+game open for enrollment plus the caller's own pending/approved
+applications for games whose enrollment has since closed. Cards merge
+the public-game summary with the caller's application (if any) and
+display the status as a chip in the top-right.
+
+Inline race-name form behaviour:
+- visible when the caller has no application for that game;
+- visible when the caller's last application was rejected (re-apply
+  flow, owner-confirmed in F8-04b);
+- hidden when the application is pending or approved.
+
+Cards for stale applications (enrollment closed, no public-game row):
+- pending/approved → rendered as a standalone "applied" card so the
+  caller can see their waitlist or accepted slot;
+- rejected/unknown → not rendered (no actionable info).
+-->
+<script lang="ts">
+	import { onMount } from "svelte";
+	import { account } from "$lib/account-store.svelte";
+	import { i18n, type TranslationKey } from "$lib/i18n/index.svelte";
+	import {
+		lobbyData,
+		describeLobbyError,
+	} from "$lib/lobby-data.svelte";
+	import LobbyShell from "./lobby-shell.svelte";
+	import {
+		submitApplication,
+		type ApplicationSummary,
+		type GameSummary,
+	} from "../../api/lobby";
+
+	let openApplicationFor = $state<string | null>(null);
+	let raceNameInput = $state("");
+	let raceNameError = $state<string | null>(null);
+	let submitting = $state(false);
+
+	onMount(() => {
+		lobbyData.ensure().then((client) => {
+			if (client !== null) {
+				account.ensure(client).catch(() => {});
+			}
+		});
+	});
+
+	function applicationStatusLabel(status: string): string {
+		const key = `lobby.application.status.${status}` as TranslationKey;
+		const translated = i18n.t(key);
+		if (translated === key) {
+			return i18n.t("lobby.application.status.unknown", { status });
+		}
+		return translated;
+	}
+
+	// Determine whether the inline race-name form should be visible for
+	// a given (game, application) pair. Visible when there's no
+	// application, or when the latest application was rejected so the
+	// caller can try again. Hidden for pending / approved / unknown.
+	function showApplicationForm(application: ApplicationSummary | null): boolean {
+		if (application === null) return true;
+		return application.status === "rejected";
+	}
+
+	interface RecruitmentCard {
+		game: GameSummary;
+		application: ApplicationSummary | null;
+	}
+
+	let appsByGameId = $derived.by<Map<string, ApplicationSummary>>(() => {
+		const m = new Map<string, ApplicationSummary>();
+		for (const app of lobbyData.applications) {
+			m.set(app.gameId, app);
+		}
+		return m;
+	});
+
+	let recruitmentCards = $derived.by<ReadonlyArray<RecruitmentCard>>(() => {
+		const me = account.current?.userId ?? "";
+		return lobbyData.publicGames
+			.filter((g) => g.ownerUserId !== me)
+			.map((g) => ({ game: g, application: appsByGameId.get(g.gameId) ?? null }));
+	});
+
+	// Standalone cards for stale applications (game no longer in the
+	// public-games list but the application is pending/approved).
+	// Rejected / unknown stale applications are intentionally hidden.
+	let standaloneApplications = $derived.by<ReadonlyArray<ApplicationSummary>>(() => {
+		const seen = new Set(lobbyData.publicGames.map((g) => g.gameId));
+		return lobbyData.applications.filter(
+			(app) =>
+				!seen.has(app.gameId) &&
+				(app.status === "pending" || app.status === "approved"),
+		);
+	});
+
+	function openApplicationForm(gameId: string): void {
+		openApplicationFor = gameId;
+		raceNameInput = "";
+		raceNameError = null;
+	}
+
+	function cancelApplicationForm(): void {
+		openApplicationFor = null;
+		raceNameInput = "";
+		raceNameError = null;
+	}
+
+	async function submitApplicationFor(gameId: string): Promise<void> {
+		const client = lobbyData.client;
+		if (client === null) return;
+		const trimmed = raceNameInput.trim();
+		if (trimmed === "") {
+			raceNameError = i18n.t("lobby.application.race_name_required");
+			return;
+		}
+		submitting = true;
+		raceNameError = null;
+		try {
+			const result = await submitApplication(client, gameId, trimmed);
+			lobbyData.prependApplication(result);
+			openApplicationFor = null;
+			raceNameInput = "";
+		} catch (err) {
+			raceNameError = describeLobbyError(err);
+		} finally {
+			submitting = false;
+		}
+	}
+</script>
+
+<LobbyShell>
+	{#if lobbyData.configError !== null}
+		<p role="alert" data-testid="account-error">{lobbyData.configError}</p>
+	{:else if lobbyData.error !== null}
+		<p role="alert" data-testid="lobby-error">{lobbyData.error}</p>
+	{/if}
+
+	<section data-testid="lobby-games-recruitment-section">
+		<h2>{i18n.t("lobby.section.recruitment")}</h2>
+		{#if lobbyData.loading}
+			<p role="status">{i18n.t("lobby.list_loading")}</p>
+		{:else if recruitmentCards.length === 0 && standaloneApplications.length === 0}
+			<p data-testid="lobby-recruitment-empty">
+				{i18n.t("lobby.recruitment.empty")}
+			</p>
+		{:else}
+			<ul class="card-list">
+				{#each recruitmentCards as card (card.game.gameId)}
+					<li class="card" data-testid="lobby-recruitment-card">
+						<div class="card-header">
+							<strong>{card.game.gameName}</strong>
+							{#if card.application !== null}
+								<span
+									class="status-chip"
+									data-status={card.application.status}
+									data-testid="lobby-application-status-chip"
+								>
+									{applicationStatusLabel(card.application.status)}
+								</span>
+							{/if}
+						</div>
+						<span class="meta">{card.game.status}</span>
+						<span class="meta">{card.game.minPlayers}–{card.game.maxPlayers} players</span>
+
+						{#if showApplicationForm(card.application)}
+							{#if openApplicationFor === card.game.gameId}
+								<form
+									onsubmit={(event) => {
+										event.preventDefault();
+										submitApplicationFor(card.game.gameId);
+									}}
+									data-testid="lobby-application-form"
+								>
+									<label>
+										{i18n.t("lobby.application.race_name_label")}
+										<input
+											type="text"
+											bind:value={raceNameInput}
+											data-testid="lobby-application-race-name"
+											autocomplete="off"
+										/>
+									</label>
+									{#if raceNameError !== null}
+										<p role="alert" data-testid="lobby-application-error">
+											{raceNameError}
+										</p>
+									{/if}
+									<div class="actions">
+										<button
+											type="submit"
+											disabled={submitting}
+											data-testid="lobby-application-submit"
+										>
+											{i18n.t("lobby.application.submit")}
+										</button>
+										<button
+											type="button"
+											onclick={cancelApplicationForm}
+											data-testid="lobby-application-cancel"
+										>
+											{i18n.t("lobby.application.cancel")}
+										</button>
+									</div>
+								</form>
+							{:else}
+								<button
+									onclick={() => openApplicationForm(card.game.gameId)}
+									data-testid="lobby-public-game-apply"
+								>
+									{i18n.t("lobby.application.submit_for", {
+										name: card.game.gameName,
+									})}
+								</button>
+							{/if}
+						{:else if card.application?.status === "pending"}
+							<p class="meta">{i18n.t("lobby.recruitment.applied_pending")}</p>
+						{:else if card.application?.status === "approved"}
+							<p class="meta">{i18n.t("lobby.recruitment.applied_approved")}</p>
+						{/if}
+					</li>
+				{/each}
+
+				{#each standaloneApplications as app (app.applicationId)}
+					<li class="card" data-testid="lobby-stale-application-card">
+						<div class="card-header">
+							<strong>{app.raceName}</strong>
+							<span
+								class="status-chip"
+								data-status={app.status}
+								data-testid="lobby-application-status-chip"
+							>
+								{applicationStatusLabel(app.status)}
+							</span>
+						</div>
+						<span class="meta">{app.gameId}</span>
+						{#if app.status === "pending"}
+							<p class="meta">{i18n.t("lobby.recruitment.applied_pending")}</p>
+						{:else}
+							<p class="meta">{i18n.t("lobby.recruitment.applied_approved")}</p>
+						{/if}
+					</li>
+				{/each}
+			</ul>
+		{/if}
+	</section>
+</LobbyShell>
+
+<style>
+	section { margin-bottom: var(--space-6); }
+	section h2 { font-size: var(--text-lg); margin: 0 0 var(--space-3); }
+	.card-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: var(--space-2); }
+	.card {
+		display: flex;
+		flex-direction: column;
+		gap: var(--space-1);
+		padding: var(--space-3);
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-md);
+		background: var(--color-surface-raised);
+		text-align: left;
+		font: inherit;
+		width: 100%;
+	}
+	.card-header {
+		display: flex;
+		align-items: flex-start;
+		justify-content: space-between;
+		gap: var(--space-2);
+	}
+	.status-chip {
+		align-self: flex-start;
+		padding: 0.1rem var(--space-2);
+		border-radius: var(--radius-pill);
+		background: var(--color-surface);
+		font-size: var(--text-xs);
+		color: var(--color-text-muted);
+		text-transform: lowercase;
+	}
+	.status-chip[data-status="approved"] {
+		color: var(--color-accent);
+	}
+	.status-chip[data-status="rejected"] {
+		color: var(--color-danger, #c33);
+	}
+	.meta { color: var(--color-text-muted); font-size: var(--text-sm); }
+	.actions { display: flex; gap: var(--space-2); margin-top: var(--space-1); }
+	form { display: flex; flex-direction: column; gap: var(--space-2); margin-top: var(--space-2); }
+	label { display: flex; flex-direction: column; gap: var(--space-1); }
+	input[type="text"] { font: inherit; font-size: var(--text-md); padding: var(--space-1) var(--space-2); }
+</style>

ui/frontend/src/lib/screens/lobby-create-screen.svelte

@@ -40,6 +40,15 @@
 
 	function describeLobbyError(err: unknown): string {
 		if (err instanceof LobbyError) {
+			// Free-tier callers reach this branch when the backend gate
+			// at `lobby.game.create` rejects them. Show the dedicated
+			// inline message instead of the generic "operation
+			// forbidden" — the user got to this screen via the
+			// `private games` panel, so we want to spell out that the
+			// gate is the tier (not a permission misconfig).
+			if (err.code === "forbidden") {
+				return i18n.t("lobby.create.error.forbidden");
+			}
 			const key = `lobby.error.${err.code}` as TranslationKey;
 			const translated = i18n.t(key);
 			if (translated !== key) {
@@ -93,7 +102,10 @@
 				turnSchedule: trimmedSchedule,
 				targetEngineVersion: targetEngineVersion.trim() || DEFAULT_TARGET_ENGINE_VERSION,
 			});
-			appScreen.go("lobby");
+			// Land on the private-games panel where the freshly created
+			// game shows up — the lobby-data store will refresh on next
+			// mount.
+			appScreen.go("games-private-games");
 		} catch (err) {
 			formError = describeLobbyError(err);
 		} finally {

ui/frontend/src/lib/screens/lobby-screen.svelte

@@ -1,544 +1,32 @@
+<!--
+Resolver for the bare `lobby` AppScreen literal. F8-04b split the
+old single-page Overview into per-panel screens (`games-active-past`,
+`games-recruitment`, `games-invitations`, `games-private-games`); this
+component is what the dispatcher renders when the active screen is
+the historical `lobby` alias (e.g. a snapshot persisted before the
+split, or programmatic `appScreen.go("lobby")` from non-shell code).
+
+The resolver navigates to the first visible games sub-page at mount
+time and renders a thin LobbyShell placeholder while the redirect
+runs. The destination depends on the account tier and on whether the
+caller has any games yet — both are computed by the shell, so we just
+pick `games-recruitment` here as the canonical landing (always
+visible) and let the shell's submenu logic surface the others.
+-->
 <script lang="ts">
 	import { onMount } from "svelte";
-	import { appScreen, activeView } from "$lib/app-nav.svelte";
-
-	import { createGatewayClient } from "../../api/connect";
-	import { GalaxyClient } from "../../api/galaxy-client";
-	import {
-		LobbyError,
-		listMyApplications,
-		listMyGames,
-		listMyInvites,
-		listPublicGames,
-		redeemInvite,
-		declineInvite,
-		submitApplication,
-		type ApplicationSummary,
-		type GameSummary,
-		type InviteSummary,
-	} from "../../api/lobby";
-	import { account } from "$lib/account-store.svelte";
-	import { gatewayRpcBaseUrl, GATEWAY_RESPONSE_PUBLIC_KEY } from "$lib/env";
-	import {
-		SyntheticReportError,
-		loadSyntheticReportFromJSON,
-	} from "../../api/synthetic-report";
-	import { i18n, type TranslationKey } from "$lib/i18n/index.svelte";
-	import { loadCore } from "../../platform/core/index";
-	import { session } from "$lib/session-store.svelte";
+	import { appScreen } from "$lib/app-nav.svelte";
+	import { i18n } from "$lib/i18n/index.svelte";
 	import LobbyShell from "./lobby-shell.svelte";
 
-	let configError: string | null = $state(null);
-	let listsLoading = $state(true);
-	let lobbyError: string | null = $state(null);
-
-	let myGames: GameSummary[] = $state([]);
-	let invitations: InviteSummary[] = $state([]);
-	let applications: ApplicationSummary[] = $state([]);
-	let publicGames: GameSummary[] = $state([]);
-
-	let openApplicationFor: string | null = $state(null);
-	let raceNameInput = $state("");
-	let raceNameError: string | null = $state(null);
-	let submittingApplication = $state(false);
-
-	let inviteActionInFlight: string | null = $state(null);
-
-	let syntheticError: string | null = $state(null);
-
-	let client: GalaxyClient | null = null;
-
-	async function sha256(payload: Uint8Array): Promise<Uint8Array> {
-		const digest = await crypto.subtle.digest("SHA-256", payload as BufferSource);
-		return new Uint8Array(digest);
-	}
-
-	function describeLobbyError(err: unknown): string {
-		if (err instanceof LobbyError) {
-			const key = `lobby.error.${err.code}` as TranslationKey;
-			const translated = i18n.t(key);
-			if (translated !== key) {
-				return translated;
-			}
-			return i18n.t("lobby.error.unknown", { message: err.message });
-		}
-		return err instanceof Error ? err.message : "request failed";
-	}
-
-	async function refreshAll(): Promise<void> {
-		if (client === null) return;
-		listsLoading = true;
-		lobbyError = null;
-		try {
-			const [games, invites, apps, publicPage] = await Promise.all([
-				listMyGames(client),
-				listMyInvites(client),
-				listMyApplications(client),
-				listPublicGames(client),
-			]);
-			myGames = games;
-			invitations = invites.filter((invite) => invite.status === "pending");
-			applications = apps;
-			publicGames = publicPage.items;
-		} catch (err) {
-			lobbyError = describeLobbyError(err);
-		} finally {
-			listsLoading = false;
-		}
-	}
-
-	function applicationStatusLabel(status: string): string {
-		const key = `lobby.application.status.${status}` as TranslationKey;
-		const translated = i18n.t(key);
-		if (translated === key) {
-			return i18n.t("lobby.application.status.unknown", { status });
-		}
-		return translated;
-	}
-
-	function openApplicationForm(gameId: string): void {
-		openApplicationFor = gameId;
-		raceNameInput = "";
-		raceNameError = null;
-	}
-
-	function cancelApplicationForm(): void {
-		openApplicationFor = null;
-		raceNameInput = "";
-		raceNameError = null;
-	}
-
-	async function submitApplicationFor(gameId: string): Promise<void> {
-		if (client === null) return;
-		const trimmed = raceNameInput.trim();
-		if (trimmed === "") {
-			raceNameError = i18n.t("lobby.application.race_name_required");
-			return;
-		}
-		submittingApplication = true;
-		raceNameError = null;
-		try {
-			const result = await submitApplication(client, gameId, trimmed);
-			applications = [result, ...applications];
-			openApplicationFor = null;
-			raceNameInput = "";
-		} catch (err) {
-			raceNameError = describeLobbyError(err);
-		} finally {
-			submittingApplication = false;
-		}
-	}
-
-	async function acceptInvite(invite: InviteSummary): Promise<void> {
-		if (client === null) return;
-		inviteActionInFlight = invite.inviteId;
-		try {
-			await redeemInvite(client, invite.gameId, invite.inviteId);
-			invitations = invitations.filter((i) => i.inviteId !== invite.inviteId);
-			myGames = await listMyGames(client);
-		} catch (err) {
-			lobbyError = describeLobbyError(err);
-		} finally {
-			inviteActionInFlight = null;
-		}
-	}
-
-	async function rejectInvite(invite: InviteSummary): Promise<void> {
-		if (client === null) return;
-		inviteActionInFlight = invite.inviteId;
-		try {
-			await declineInvite(client, invite.gameId, invite.inviteId);
-			invitations = invitations.filter((i) => i.inviteId !== invite.inviteId);
-		} catch (err) {
-			lobbyError = describeLobbyError(err);
-		} finally {
-			inviteActionInFlight = null;
-		}
-	}
-
-	function gotoCreate(): void {
-		appScreen.go("lobby-create");
-	}
-
-	function gotoGame(gameId: string): void {
-		// Enter a fresh game on the map view: reset the in-game view
-		// state first so a stale snapshot from a previous game does not
-		// leak into the new one, then switch the top-level screen.
-		activeView.reset();
-		appScreen.go("game", { gameId });
-	}
-
-	async function onSyntheticFileChange(
-		event: Event & { currentTarget: HTMLInputElement },
-	): Promise<void> {
-		// Capture the element synchronously: `event.currentTarget`
-		// is nulled by the time any of the awaits below resolve, and
-		// reaching for it from the `finally` block then throws
-		// "null is not an object". The reset still has to happen so
-		// re-selecting the same file fires `change` again.
-		const input = event.currentTarget;
-		syntheticError = null;
-		const file = input.files?.[0];
-		if (file === undefined) return;
-		try {
-			const text = await file.text();
-			const json: unknown = JSON.parse(text);
-			const { gameId } = loadSyntheticReportFromJSON(json);
-			activeView.reset();
-			appScreen.go("game", { gameId });
-		} catch (err) {
-			if (err instanceof SyntheticReportError) {
-				syntheticError = err.message;
-			} else if (err instanceof SyntaxError) {
-				syntheticError = `invalid JSON: ${err.message}`;
-			} else if (err instanceof Error) {
-				syntheticError = err.message;
-			} else {
-				syntheticError = "failed to load synthetic report";
-			}
-		} finally {
-			input.value = "";
-		}
-	}
-
-	// Statuses for which the game has a navigable in-game view.
-	// Lobby-internal statuses (draft, enrollment_open, ready_to_start,
-	// starting, start_failed) and terminal ones (cancelled) stay
-	// non-clickable; entering them otherwise opens the game shell on a
-	// game whose runtime state does not exist yet.
-	function isPlayableStatus(status: string): boolean {
-		return status === "running" || status === "paused" || status === "finished";
-	}
-
-	onMount(async () => {
-		if (
-			session.keypair === null ||
-			session.deviceSessionId === null ||
-			GATEWAY_RESPONSE_PUBLIC_KEY.length === 0
-		) {
-			listsLoading = false;
-			if (GATEWAY_RESPONSE_PUBLIC_KEY.length === 0) {
-				configError = "VITE_GATEWAY_RESPONSE_PUBLIC_KEY is not configured";
-			}
-			return;
-		}
-		const keypair = session.keypair;
-		try {
-			const core = await loadCore();
-			client = new GalaxyClient({
-				core,
-				edge: createGatewayClient(gatewayRpcBaseUrl()),
-				signer: (canonical) => keypair.sign(canonical),
-				sha256,
-				deviceSessionId: session.deviceSessionId,
-				gatewayResponsePublicKey: GATEWAY_RESPONSE_PUBLIC_KEY,
-			});
-			// Populate the session-wide identity cache; the shell's
-			// identity strip reads from there. Swallowed errors leave
-			// the shell on the `lobby.account_loading` placeholder
-			// without breaking the rest of the lobby.
-			account.ensure(client).catch(() => {});
-			await refreshAll();
-		} catch (err) {
-			lobbyError = describeLobbyError(err);
-			listsLoading = false;
-		}
+	onMount(() => {
+		// The shell's own $effect keeps the user on a valid sub-page if
+		// the resolved choice ever becomes invisible; we just kick off
+		// the redirect on first paint.
+		appScreen.go("games-recruitment");
 	});
 </script>
 
-<LobbyShell activePage="overview">
-	{#if configError !== null}
-		<p role="alert" data-testid="account-error">{configError}</p>
-	{:else if lobbyError !== null}
-		<p role="alert" data-testid="lobby-error">{lobbyError}</p>
-	{/if}
-
-	<section data-testid="lobby-create-section">
-		<button onclick={gotoCreate} data-testid="lobby-create-button">
-			{i18n.t("lobby.create_button")}
-		</button>
-	</section>
-
-	<section data-testid="lobby-my-games-section">
-		<h2>{i18n.t("lobby.section.my_games")}</h2>
-		{#if listsLoading}
-			<p role="status">{i18n.t("lobby.list_loading")}</p>
-		{:else if myGames.length === 0}
-			<p data-testid="lobby-my-games-empty">{i18n.t("lobby.my_games.empty")}</p>
-		{:else}
-			<ul class="card-list">
-				{#each myGames as game (game.gameId)}
-					<li>
-						<button
-							class="card"
-							onclick={() => gotoGame(game.gameId)}
-							disabled={!isPlayableStatus(game.status)}
-							data-testid="lobby-my-game-card"
-						>
-							<strong>{game.gameName}</strong>
-							<span class="meta">{game.status}</span>
-							<span class="meta">{game.minPlayers}–{game.maxPlayers} players</span>
-						</button>
-					</li>
-				{/each}
-			</ul>
-		{/if}
-	</section>
-
-	<section data-testid="lobby-invitations-section">
-		<h2>{i18n.t("lobby.section.invitations")}</h2>
-		{#if listsLoading}
-			<p role="status">{i18n.t("lobby.list_loading")}</p>
-		{:else if invitations.length === 0}
-			<p data-testid="lobby-invitations-empty">{i18n.t("lobby.invitations.empty")}</p>
-		{:else}
-			<ul class="card-list">
-				{#each invitations as invite (invite.inviteId)}
-					<li class="card">
-						<strong>{invite.raceName}</strong>
-						<span class="meta">{invite.gameId}</span>
-						<div class="actions">
-							<button
-								onclick={() => acceptInvite(invite)}
-								disabled={inviteActionInFlight === invite.inviteId}
-								data-testid="lobby-invite-accept"
-							>
-								{i18n.t("lobby.invitation.accept")}
-							</button>
-							<button
-								onclick={() => rejectInvite(invite)}
-								disabled={inviteActionInFlight === invite.inviteId}
-								data-testid="lobby-invite-decline"
-							>
-								{i18n.t("lobby.invitation.decline")}
-							</button>
-						</div>
-					</li>
-				{/each}
-			</ul>
-		{/if}
-	</section>
-
-	<section data-testid="lobby-applications-section">
-		<h2>{i18n.t("lobby.section.applications")}</h2>
-		{#if listsLoading}
-			<p role="status">{i18n.t("lobby.list_loading")}</p>
-		{:else if applications.length === 0}
-			<p data-testid="lobby-applications-empty">{i18n.t("lobby.applications.empty")}</p>
-		{:else}
-			<ul class="card-list">
-				{#each applications as app (app.applicationId)}
-					<li class="card" data-testid="lobby-application-card">
-						<strong>{app.raceName}</strong>
-						<span class="meta">{app.gameId}</span>
-						<span class="status" data-status={app.status}>
-							{applicationStatusLabel(app.status)}
-						</span>
-					</li>
-				{/each}
-			</ul>
-		{/if}
-	</section>
-
-	{#if import.meta.env.VITE_GALAXY_DEV_AFFORDANCES === "true"}
-		<!--
-		Synthetic-report loader. Dev-only affordance for visual testing
-		against rich game states without playing many turns. The JSON
-		is produced offline by the Go CLI in
-		`tools/local-dev/legacy-report/`; see
-		`ui/docs/testing.md#synthetic-reports` for the workflow. Gated
-		on `VITE_GALAXY_DEV_AFFORDANCES` (set in `.env.development` and
-		mirrored by `dev-deploy.yaml`) rather than `import.meta.env.DEV`
-		so the long-lived dev environment can also surface it from a
-		production-mode bundle. The prod build path leaves the flag
-		unset, so the section is stripped from prod chunks.
-		-->
-		<section data-testid="lobby-synthetic-section">
-			<h2>Synthetic test reports (DEV)</h2>
-			<p class="meta">
-				Load a JSON file produced by
-				<code>legacy-report-to-json</code> to open the map view
-				against a synthetic snapshot. Orders compose locally but
-				never reach the server.
-			</p>
-			<label class="synthetic-loader">
-				Load JSON…
-				<input
-					type="file"
-					accept=".json,application/json"
-					onchange={onSyntheticFileChange}
-					data-testid="lobby-synthetic-file"
-				/>
-			</label>
-			{#if syntheticError !== null}
-				<p role="alert" data-testid="lobby-synthetic-error">
-					{syntheticError}
-				</p>
-			{/if}
-		</section>
-	{/if}
-
-	<section data-testid="lobby-public-games-section">
-		<h2>{i18n.t("lobby.section.public_games")}</h2>
-		{#if listsLoading}
-			<p role="status">{i18n.t("lobby.list_loading")}</p>
-		{:else if publicGames.length === 0}
-			<p data-testid="lobby-public-games-empty">{i18n.t("lobby.public_games.empty")}</p>
-		{:else}
-			<ul class="card-list">
-				{#each publicGames as game (game.gameId)}
-					<li class="card">
-						<strong>{game.gameName}</strong>
-						<span class="meta">{game.status}</span>
-						<span class="meta">{game.minPlayers}–{game.maxPlayers} players</span>
-						{#if openApplicationFor === game.gameId}
-							<form
-								onsubmit={(event) => {
-									event.preventDefault();
-									submitApplicationFor(game.gameId);
-								}}
-								data-testid="lobby-application-form"
-							>
-								<label>
-									{i18n.t("lobby.application.race_name_label")}
-									<input
-										type="text"
-										bind:value={raceNameInput}
-										data-testid="lobby-application-race-name"
-										autocomplete="off"
-									/>
-								</label>
-								{#if raceNameError !== null}
-									<p role="alert" data-testid="lobby-application-error">
-										{raceNameError}
-									</p>
-								{/if}
-								<div class="actions">
-									<button
-										type="submit"
-										disabled={submittingApplication}
-										data-testid="lobby-application-submit"
-									>
-										{i18n.t("lobby.application.submit")}
-									</button>
-									<button
-										type="button"
-										onclick={cancelApplicationForm}
-										data-testid="lobby-application-cancel"
-									>
-										{i18n.t("lobby.application.cancel")}
-									</button>
-								</div>
-							</form>
-						{:else}
-							<button
-								onclick={() => openApplicationForm(game.gameId)}
-								data-testid="lobby-public-game-apply"
-							>
-								{i18n.t("lobby.application.submit_for", { name: game.gameName })}
-							</button>
-						{/if}
-					</li>
-				{/each}
-			</ul>
-		{/if}
-	</section>
+<LobbyShell>
+	<p role="status">{i18n.t("lobby.list_loading")}</p>
 </LobbyShell>
-
-<style>
-	section {
-		margin-bottom: var(--space-6);
-	}
-
-	section h2 {
-		font-size: var(--text-lg);
-		margin: 0 0 var(--space-3);
-	}
-
-	.card-list {
-		list-style: none;
-		padding: 0;
-		margin: 0;
-		display: flex;
-		flex-direction: column;
-		gap: var(--space-2);
-	}
-
-	.card {
-		display: flex;
-		flex-direction: column;
-		gap: var(--space-1);
-		padding: var(--space-3);
-		border: 1px solid var(--color-border);
-		border-radius: var(--radius-md);
-		background: var(--color-surface-raised);
-		text-align: left;
-		font: inherit;
-		cursor: pointer;
-		width: 100%;
-	}
-
-	button.card:disabled {
-		cursor: not-allowed;
-		color: var(--color-text-faint);
-		background: var(--color-surface);
-	}
-
-	li.card {
-		cursor: default;
-	}
-
-	.meta {
-		color: var(--color-text-muted);
-		font-size: var(--text-sm);
-	}
-
-	.status {
-		align-self: flex-start;
-		padding: 0.1rem var(--space-2);
-		border-radius: var(--radius-pill);
-		background: var(--color-surface-raised);
-		font-size: var(--text-xs);
-	}
-
-	.actions {
-		display: flex;
-		gap: var(--space-2);
-		margin-top: var(--space-1);
-	}
-
-	form {
-		display: flex;
-		flex-direction: column;
-		gap: var(--space-2);
-		margin-top: var(--space-2);
-	}
-
-	label {
-		display: flex;
-		flex-direction: column;
-		gap: var(--space-1);
-	}
-
-	input[type="text"] {
-		font: inherit;
-		font-size: var(--text-md);
-		padding: var(--space-1) var(--space-2);
-	}
-
-	.synthetic-loader {
-		display: inline-flex;
-		align-items: center;
-		gap: var(--space-2);
-		padding: var(--space-1) var(--space-3);
-		border: 1px dashed var(--color-text-muted);
-		border-radius: var(--radius-md);
-		background: var(--color-surface-raised);
-		cursor: pointer;
-		font: inherit;
-	}
-
-	.synthetic-loader input[type="file"] {
-		font-size: var(--text-sm);
-	}
-</style>

ui/frontend/src/lib/screens/lobby-shell.svelte

@@ -1,36 +1,110 @@
 <!--
-Shared chrome for the post-login "site"-style pages — the lobby
-landing and the editable profile. Renders a left page-list sidebar
-(mirroring the project site's VitePress layout) plus a top identity
-strip ("Player-xxxx" → opens profile, logout). Children fill the
-right-hand column. Pages mark themselves active via `activePage`.
+Shared chrome for the post-login lobby pages and the profile screen.
+Renders a left page-list sidebar (mirroring the project site's
+VitePress layout) plus a top identity strip ("Player-xxxx" → opens
+profile, logout). Children fill the right-hand column.
+
+F8-04b extends the sidebar to a two-level hierarchy:
+- top-level items: `games` (with submenu), `profile`, and DEV-only
+  `synthetic test reports`;
+- `games` submenu: `active-past` (hidden when the player has no games),
+  `recruitment` (always), `invitations` (always), `private games`
+  (paid-tier only; DEV overrides).
+
+Desktop (>640px): the submenu stays expanded as long as the active
+screen is one of the games sub-panels. Mobile (≤640px, existing
+horizontal-strip breakpoint): the `games` item becomes a dropdown
+labeled "games · {active-sub} ▾"; tapping toggles the popover, tapping
+outside or pressing Escape closes it, and re-selecting the active
+sub-item is a no-op (mirrors the F8-02 idiom from issue #45).
 
 The identity strip reads directly from the session-wide `account`
-store so navigating Overview ⇄ Profile never re-renders an empty
-placeholder: both screens populate the same cache through
-`account.ensure(client)` and the shell renders the latest value.
+store so navigating between sub-pages never re-renders an empty
+placeholder.
 -->
 <script lang="ts">
-	import type { Snippet } from "svelte";
-	import { appScreen } from "$lib/app-nav.svelte";
-	import { i18n } from "$lib/i18n/index.svelte";
+	import { onMount, type Snippet } from "svelte";
+	import {
+		appScreen,
+		isLobbySubScreen,
+		LOBBY_SUB_SCREENS,
+		type AppScreen,
+	} from "$lib/app-nav.svelte";
+	import { i18n, type TranslationKey } from "$lib/i18n/index.svelte";
 	import { session } from "$lib/session-store.svelte";
 	import { account } from "$lib/account-store.svelte";
-
-	type Page = "overview" | "profile";
+	import { lobbyData } from "$lib/lobby-data.svelte";
 
 	interface Props {
-		activePage: Page;
 		children: Snippet;
 	}
 
-	let { activePage, children }: Props = $props();
+	let { children }: Props = $props();
 
-	const PAGES: ReadonlyArray<{ id: Page; labelKey: "lobby.nav.overview" | "lobby.nav.profile"; screen: "lobby" | "profile" }> = [
-		{ id: "overview", labelKey: "lobby.nav.overview", screen: "lobby" },
-		{ id: "profile", labelKey: "lobby.nav.profile", screen: "profile" },
+	const DEV_AFFORDANCES =
+		import.meta.env.VITE_GALAXY_DEV_AFFORDANCES === "true";
+
+	type GamesSubId = (typeof LOBBY_SUB_SCREENS)[number];
+
+	interface GamesSubItem {
+		id: GamesSubId;
+		labelKey: TranslationKey;
+		visible: () => boolean;
+	}
+
+	const GAMES_SUBS: ReadonlyArray<GamesSubItem> = [
+		{
+			id: "games-active-past",
+			labelKey: "lobby.nav.games.active_past",
+			visible: () => lobbyData.myGames.length > 0,
+		},
+		{
+			id: "games-recruitment",
+			labelKey: "lobby.nav.games.recruitment",
+			visible: () => true,
+		},
+		{
+			id: "games-invitations",
+			labelKey: "lobby.nav.games.invitations",
+			visible: () => true,
+		},
+		{
+			id: "games-private-games",
+			labelKey: "lobby.nav.games.private_games",
+			visible: () =>
+				DEV_AFFORDANCES || account.current?.entitlement.isPaid === true,
+		},
 	];
 
+	function visibleGamesSubs(): ReadonlyArray<GamesSubItem> {
+		return GAMES_SUBS.filter((sub) => sub.visible());
+	}
+
+	function firstVisibleGamesScreen(): AppScreen {
+		const visible = visibleGamesSubs();
+		// recruitment is unconditionally visible, so visible is never
+		// empty — but keep the fallback for type safety.
+		return visible[0]?.id ?? "games-recruitment";
+	}
+
+	function gotoScreen(screen: AppScreen): void {
+		if (appScreen.screen !== screen) {
+			appScreen.go(screen);
+		}
+	}
+
+	function gotoGamesParent(): void {
+		gotoScreen(firstVisibleGamesScreen());
+	}
+
+	let activeGamesSub = $derived.by<GamesSubItem | null>(() => {
+		return GAMES_SUBS.find((s) => s.id === appScreen.screen) ?? null;
+	});
+
+	let gamesActive = $derived.by(() => isLobbySubScreen(appScreen.screen));
+	let profileActive = $derived.by(() => appScreen.screen === "profile");
+	let syntheticActive = $derived.by(() => appScreen.screen === "synthetic-reports");
+
 	let identityLabel = $derived.by(() => {
 		const current = account.current;
 		if (current !== null) {
@@ -41,19 +115,79 @@ placeholder: both screens populate the same cache through
 		return i18n.t("lobby.account_loading");
 	});
 
-	function gotoPage(screen: "lobby" | "profile"): void {
-		if (appScreen.screen !== screen) {
-			appScreen.go(screen);
-		}
-	}
-
 	function gotoProfile(): void {
-		gotoPage("profile");
+		gotoScreen("profile");
 	}
 
 	async function logout(): Promise<void> {
 		await session.signOut("user");
 	}
+
+	// Mobile dropdown state for the games submenu. Closed on subitem
+	// selection, click outside, Escape, and on tap of the toggle when
+	// already open.
+	let mobileMenuOpen = $state(false);
+	let mobileMenuEl: HTMLElement | null = null;
+
+	function toggleMobileMenu(): void {
+		mobileMenuOpen = !mobileMenuOpen;
+	}
+
+	function selectMobileSub(screen: AppScreen): void {
+		mobileMenuOpen = false;
+		gotoScreen(screen);
+	}
+
+	function handleMobileKeydown(event: KeyboardEvent): void {
+		if (event.key === "Escape" && mobileMenuOpen) {
+			mobileMenuOpen = false;
+		}
+	}
+
+	function handleDocumentPointerDown(event: PointerEvent): void {
+		if (!mobileMenuOpen) return;
+		if (mobileMenuEl !== null && event.target instanceof Node) {
+			if (!mobileMenuEl.contains(event.target)) {
+				mobileMenuOpen = false;
+			}
+		}
+	}
+
+	onMount(() => {
+		document.addEventListener("pointerdown", handleDocumentPointerDown);
+		document.addEventListener("keydown", handleMobileKeydown);
+		return () => {
+			document.removeEventListener("pointerdown", handleDocumentPointerDown);
+			document.removeEventListener("keydown", handleMobileKeydown);
+		};
+	});
+
+	// Persisted snapshot may restore the user onto `games-private-games`
+	// after a tier downgrade or onto `synthetic-reports` in a prod
+	// bundle that strips the DEV affordance. Resolve quietly to the
+	// first visible games sub-page instead of letting the dispatcher
+	// render an empty shell.
+	$effect(() => {
+		const screen = appScreen.screen;
+		if (screen === "games-private-games") {
+			if (!DEV_AFFORDANCES && account.current?.entitlement.isPaid !== true) {
+				appScreen.go(firstVisibleGamesScreen());
+			}
+		} else if (screen === "synthetic-reports") {
+			if (!DEV_AFFORDANCES) {
+				appScreen.go(firstVisibleGamesScreen());
+			}
+		} else if (screen === "games-active-past") {
+			// Hide-when-empty is asymmetric: we only kick the user out if
+			// the lobby-data store has actually reported zero games (not
+			// during the initial `loading=true` window). Otherwise a
+			// fresh navigation would bounce off this screen before the
+			// fan-out resolves.
+			if (!lobbyData.loading && lobbyData.myGames.length === 0) {
+				appScreen.go(firstVisibleGamesScreen());
+			}
+		}
+	});
 </script>
 
 <a class="skip-link" href="#main-content">{i18n.t("common.skip_to_content")}</a>
@@ -73,21 +207,116 @@ placeholder: both screens populate the same cache through
 	</header>
 	<div class="body">
 		<nav class="sidebar" aria-label={i18n.t("lobby.nav.aria_label")}>
-			<ul>
-				{#each PAGES as page (page.id)}
+			<ul class="top-list">
+				<li class="games-item">
+					<button
+						type="button"
+						class="nav-link parent"
+						class:active={gamesActive}
+						aria-current={gamesActive ? "page" : undefined}
+						onclick={gotoGamesParent}
+						data-testid="lobby-nav-games"
+					>
+						{i18n.t("lobby.nav.games")}
+					</button>
+
+					<!-- Desktop submenu: always expanded when in `games-*` -->
+					<ul
+						class="submenu desktop-only"
+						aria-label={i18n.t("lobby.nav.games.aria_label")}
+					>
+						{#each visibleGamesSubs() as sub (sub.id)}
+							<li>
+								<button
+									type="button"
+									class="nav-link sub"
+									class:active={appScreen.screen === sub.id}
+									aria-current={appScreen.screen === sub.id ? "page" : undefined}
+									onclick={() => gotoScreen(sub.id)}
+									data-testid="lobby-nav-{sub.id}"
+								>
+									{i18n.t(sub.labelKey)}
+								</button>
+							</li>
+						{/each}
+					</ul>
+
+					<!-- Mobile dropdown: only the active sub is shown as a
+					     button, tap toggles the popover with the visible
+					     subs. Re-tap on the active sub is a no-op. -->
+					<div
+						class="mobile-dropdown mobile-only"
+						bind:this={mobileMenuEl}
+					>
+						<button
+							type="button"
+							class="nav-link mobile-toggle"
+							class:active={gamesActive}
+							aria-haspopup="listbox"
+							aria-expanded={mobileMenuOpen}
+							onclick={toggleMobileMenu}
+							data-testid="lobby-nav-games-mobile"
+						>
+							{i18n.t("lobby.nav.games.mobile_toggle", {
+								label: activeGamesSub
+									? i18n.t(activeGamesSub.labelKey)
+									: i18n.t("lobby.nav.games.recruitment"),
+							})}
+							<span aria-hidden="true">▾</span>
+						</button>
+						{#if mobileMenuOpen}
+							<ul
+								class="mobile-popover"
+								role="listbox"
+								aria-label={i18n.t("lobby.nav.games.aria_label")}
+							>
+								{#each visibleGamesSubs() as sub (sub.id)}
+									<li>
+										<button
+											type="button"
+											class="popover-item"
+											class:active={appScreen.screen === sub.id}
+											role="option"
+											aria-selected={appScreen.screen === sub.id}
+											onclick={() => selectMobileSub(sub.id)}
+											data-testid="lobby-nav-{sub.id}-mobile"
+										>
+											{i18n.t(sub.labelKey)}
+										</button>
+									</li>
+								{/each}
+							</ul>
+						{/if}
+					</div>
+				</li>
+
+				<li>
+					<button
+						type="button"
+						class="nav-link"
+						class:active={profileActive}
+						aria-current={profileActive ? "page" : undefined}
+						onclick={gotoProfile}
+						data-testid="lobby-nav-profile"
+					>
+						{i18n.t("lobby.nav.profile")}
+					</button>
+				</li>
+
+				{#if DEV_AFFORDANCES}
 					<li>
 						<button
 							type="button"
 							class="nav-link"
-							class:active={activePage === page.id}
-							aria-current={activePage === page.id ? "page" : undefined}
-							onclick={() => gotoPage(page.screen)}
-							data-testid="lobby-nav-{page.id}"
+							class:active={syntheticActive}
+							aria-current={syntheticActive ? "page" : undefined}
+							onclick={() => gotoScreen("synthetic-reports")}
+							data-testid="lobby-nav-synthetic-reports"
 						>
-							{i18n.t(page.labelKey)}
+							{i18n.t("lobby.nav.synthetic_reports")}
 						</button>
 					</li>
-				{/each}
+				{/if}
 			</ul>
 		</nav>
 		<main id="main-content" tabindex="-1" class="content">
@@ -160,7 +389,8 @@ placeholder: both screens populate the same cache through
 		background: var(--color-surface);
 	}
 
-	.sidebar ul {
+	.top-list,
+	.submenu {
 		list-style: none;
 		margin: 0;
 		padding: 0;
@@ -169,6 +399,11 @@ placeholder: both screens populate the same cache through
 		gap: var(--space-1);
 	}
 
+	.submenu {
+		margin-left: var(--space-3);
+		margin-top: var(--space-1);
+	}
+
 	.nav-link {
 		display: block;
 		width: 100%;
@@ -183,6 +418,16 @@ placeholder: both screens populate the same cache through
 		cursor: pointer;
 	}
 
+	.nav-link.sub {
+		font-size: var(--text-sm);
+		padding: var(--space-1) var(--space-3);
+	}
+
+	.nav-link.parent.active {
+		color: var(--color-text);
+		font-weight: var(--weight-medium);
+	}
+
 	.nav-link:hover {
 		background: var(--color-surface-hover);
 		color: var(--color-text);
@@ -200,6 +445,62 @@ placeholder: both screens populate the same cache through
 		max-width: 48rem;
 	}
 
+	.mobile-dropdown {
+		position: relative;
+		display: none;
+	}
+
+	.mobile-toggle {
+		display: flex;
+		align-items: center;
+		gap: var(--space-1);
+		justify-content: space-between;
+	}
+
+	.mobile-popover {
+		position: absolute;
+		top: calc(100% + var(--space-1));
+		left: 0;
+		right: 0;
+		z-index: 5;
+		list-style: none;
+		margin: 0;
+		padding: var(--space-1);
+		background: var(--color-surface-raised);
+		border: 1px solid var(--color-border);
+		border-radius: var(--radius-md);
+		box-shadow: var(--shadow-sm, 0 4px 12px rgba(0, 0, 0, 0.15));
+	}
+
+	.popover-item {
+		display: block;
+		width: 100%;
+		text-align: left;
+		font: inherit;
+		font-size: var(--text-sm);
+		color: var(--color-text-muted);
+		background: transparent;
+		border: none;
+		padding: var(--space-2) var(--space-3);
+		border-radius: var(--radius-sm);
+		cursor: pointer;
+	}
+
+	.popover-item:hover {
+		background: var(--color-surface-hover);
+		color: var(--color-text);
+	}
+
+	.popover-item.active {
+		color: var(--color-accent);
+		background: var(--color-accent-subtle);
+		font-weight: var(--weight-medium);
+	}
+
+	.mobile-only {
+		display: none;
+	}
+
 	@media (max-width: 640px) {
 		.body {
 			flex-direction: column;
@@ -210,7 +511,7 @@ placeholder: both screens populate the same cache through
 			border-bottom: 1px solid var(--color-border-subtle);
 			padding: var(--space-2) var(--space-3);
 		}
-		.sidebar ul {
+		.top-list {
 			flex-direction: row;
 			gap: var(--space-2);
 			overflow-x: auto;
@@ -219,9 +520,24 @@ placeholder: both screens populate the same cache through
 			white-space: nowrap;
 			padding: var(--space-1) var(--space-3);
 		}
+		.games-item {
+			position: relative;
+		}
+		.desktop-only {
+			display: none;
+		}
+		.mobile-only,
+		.mobile-dropdown {
+			display: block;
+		}
 		.content {
 			padding: var(--space-4);
 			max-width: none;
 		}
+		/* The games-item's parent button is replaced by the mobile
+		   dropdown toggle. */
+		.nav-link.parent {
+			display: none;
+		}
 	}
 </style>

ui/frontend/src/lib/screens/profile-screen.svelte

@@ -181,7 +181,7 @@
 	});
 </script>
 
-<LobbyShell activePage="profile">
+<LobbyShell>
 	<h1>{i18n.t("profile.title")}</h1>
 	{#if configError !== null}
 		<p role="alert" data-testid="profile-config-error">{configError}</p>

ui/frontend/src/lib/screens/synthetic-reports-screen.svelte

@@ -0,0 +1,103 @@
+<!--
+DEV-only synthetic-report loader. Lifts the old `lobby.synthetic`
+section out of Overview into its own top-level sidebar item that only
+appears when `VITE_GALAXY_DEV_AFFORDANCES === "true"`. The conditional
+is statically evaluated by Vite — prod bundles strip the whole screen
+out of the tree.
+
+Reports are JSON files produced offline by the Go CLI in
+`tools/local-dev/legacy-report/`. They open the map view against a
+synthetic snapshot; orders compose locally but never reach the server.
+See `ui/docs/testing.md#synthetic-reports` for the workflow.
+-->
+<script lang="ts">
+	import { onMount } from "svelte";
+	import { appScreen, activeView } from "$lib/app-nav.svelte";
+	import { account } from "$lib/account-store.svelte";
+	import { lobbyData } from "$lib/lobby-data.svelte";
+	import LobbyShell from "./lobby-shell.svelte";
+	import {
+		SyntheticReportError,
+		loadSyntheticReportFromJSON,
+	} from "../../api/synthetic-report";
+
+	let error = $state<string | null>(null);
+
+	onMount(() => {
+		lobbyData.ensure().then((client) => {
+			if (client !== null) {
+				account.ensure(client).catch(() => {});
+			}
+		});
+	});
+
+	async function onFileChange(
+		event: Event & { currentTarget: HTMLInputElement },
+	): Promise<void> {
+		const input = event.currentTarget;
+		error = null;
+		const file = input.files?.[0];
+		if (file === undefined) return;
+		try {
+			const text = await file.text();
+			const json: unknown = JSON.parse(text);
+			const { gameId } = loadSyntheticReportFromJSON(json);
+			activeView.reset();
+			appScreen.go("game", { gameId });
+		} catch (err) {
+			if (err instanceof SyntheticReportError) {
+				error = err.message;
+			} else if (err instanceof SyntaxError) {
+				error = `invalid JSON: ${err.message}`;
+			} else if (err instanceof Error) {
+				error = err.message;
+			} else {
+				error = "failed to load synthetic report";
+			}
+		} finally {
+			input.value = "";
+		}
+	}
+</script>
+
+<LobbyShell>
+	<section data-testid="lobby-synthetic-section">
+		<h2>Synthetic test reports (DEV)</h2>
+		<p class="meta">
+			Load a JSON file produced by
+			<code>legacy-report-to-json</code> to open the map view against
+			a synthetic snapshot. Orders compose locally but never reach
+			the server.
+		</p>
+		<label class="synthetic-loader">
+			Load JSON…
+			<input
+				type="file"
+				accept=".json,application/json"
+				onchange={onFileChange}
+				data-testid="lobby-synthetic-file"
+			/>
+		</label>
+		{#if error !== null}
+			<p role="alert" data-testid="lobby-synthetic-error">{error}</p>
+		{/if}
+	</section>
+</LobbyShell>
+
+<style>
+	section { margin-bottom: var(--space-6); }
+	section h2 { font-size: var(--text-lg); margin: 0 0 var(--space-3); }
+	.meta { color: var(--color-text-muted); font-size: var(--text-sm); }
+	.synthetic-loader {
+		display: inline-flex;
+		align-items: center;
+		gap: var(--space-2);
+		padding: var(--space-1) var(--space-3);
+		border: 1px dashed var(--color-text-muted);
+		border-radius: var(--radius-md);
+		background: var(--color-surface-raised);
+		cursor: pointer;
+		font: inherit;
+	}
+	.synthetic-loader input[type="file"] { font-size: var(--text-sm); }
+</style>

ui/frontend/src/lib/session-store.svelte.ts

@@ -32,6 +32,7 @@ import {
 	setDeviceSessionId,
 } from "../api/session";
 import { account } from "./account-store.svelte";
+import { lobbyData } from "./lobby-data.svelte";
 
 export type SessionStatus =
 	| "loading"
@@ -97,8 +98,11 @@ export class SessionStore {
 		this.status = "anonymous";
 		// Drop the cached identity so a different user signing in on the
 		// same browser does not briefly see the previous display name
-		// through the post-login shell.
+		// through the post-login shell. The lobby data cache is dropped
+		// for the same reason — public games / invites / applications
+		// belong to the signed-in user.
 		account.clear();
+		lobbyData.clear();
 		if (reason === "revoked") {
 			console.info("session store: device session revoked by gateway");
 		}