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/planet-production.spec.ts

@@ -286,7 +286,12 @@ test("switching production three times collapses to one auto-synced row", async
 
 	const handle = await mockGateway(page);
 	await bootSession(page);
-	await page.goto(`/games/${GAME_ID}/map`);
+	await page.goto("/");
+	await page.waitForFunction(() => window.__galaxyNav !== undefined);
+	await page.evaluate(
+		(id) => window.__galaxyNav!.enterGame(id, "map", {}),
+		GAME_ID,
+	);
 	await expect(page.getByTestId("active-view-map")).toHaveAttribute(
 		"data-status",
 		"ready",
@@ -357,10 +362,13 @@ test("switching production three times collapses to one auto-synced row", async
 	expect(handle.lastSubmitted!.subject).toBe(SHIP_CLASS);
 	expect(handle.submitCount).toBeGreaterThanOrEqual(3);
 
-	// Reload: the layout polls user.games.order.get on boot, so the
+	// Reload: the shell polls user.games.order.get on boot, so the
 	// row is restored from the server's stored state even when the
-	// local cache is wiped.
-	await page.reload();
+	// local cache is wiped. The restored `game` screen re-stamps
+	// history via shallow routing on first render, so wait only for the
+	// navigation to commit (a default `reload()` waiting for `load`
+	// races that `pushState` and aborts).
+	await page.reload({ waitUntil: "commit" });
 	await expect(page.getByTestId("active-view-map")).toHaveAttribute(
 		"data-status",
 		"ready",