test(ui): migrate suite to the app-shell (state-driven navigation)

- Unit: repoint moved screen imports (lib/screens, lib/game), mock
  $lib/app-nav (appScreen/activeView) instead of $app/navigation, drop the
  removed gameId props, assert screen/view selection.
- e2e: add a dev-only window.__galaxyNav affordance; specs enter a game via
  enterGame(...) instead of a /games/:id URL; URL assertions become content
  assertions (the URL stays /game/); reload uses waitUntil:"commit" (shallow
  routing) and mocks /rpc on game entry.
- Remove the obsolete report scroll-restore test (it relied on a SvelteKit
  route Snapshot that no longer exists); update the missing-membership test
  to the new lobby-redirect+toast behaviour. Fix a stale report.svelte
  docstring.

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

ui/frontend/tests/e2e/storage-keypair-persistence.spec.ts

@@ -20,6 +20,25 @@ import type {
 	MapPrimitiveSnapshot,
 } from "../../src/lib/debug-surface.svelte";
 import type { WrapMode } from "../../src/map/world";
+import type {
+	AppScreen,
+	GameView,
+	GameViewState,
+} from "../../src/lib/app-nav.svelte";
+
+// View sub-parameters accepted by the dev-only nav affordance — the
+// `GameViewState` fields minus the discriminating `view`.
+type NavViewParams = Omit<GameViewState, "view">;
+
+// Mirrors the dev-only surface mounted by `routes/+page.svelte`. The
+// single-URL app-shell has no per-screen / per-view routes, so the
+// Playwright suite drives the in-memory screen and view through this
+// global instead of `page.goto("/games/:id/:view")`.
+interface NavSurface {
+	enterGame(gameId: string, view?: GameView, params?: NavViewParams): void;
+	select(view: GameView, params?: NavViewParams): void;
+	go(screen: AppScreen, opts?: { gameId?: string }): void;
+}
 
 // Mirrors the surface mounted by `routes/__debug/store/+page.svelte`.
 // Other Playwright specs (`game-shell.spec.ts`, `order-composer.spec.ts`,
@@ -56,6 +75,7 @@ interface DebugSurface {
 declare global {
 	interface Window {
 		__galaxyDebug?: DebugSurface;
+		__galaxyNav?: NavSurface;
 	}
 }