feat: show persisted investment data and sync state

Consume the provided resource-envelope API snapshot. Preserve financial snapshots during
refresh, observe synchronization without importing, and fence late responses across
account and connection changes.

src/test/handlers.ts

@@ -1,4 +1,5 @@
 import { HttpResponse, http } from "msw";
+import { resource } from "@/test/resource";
 
 const authentication = {
 	accessToken: "test-token",
@@ -26,40 +27,50 @@ const handlers = [
 		"*/api/v1/tbank-connection",
 		() => new HttpResponse(null, { status: 204 }),
 	),
-	http.get("*/api/v1/brokerage-accounts", () => HttpResponse.json([])),
+	http.get("*/api/v1/brokerage-accounts", () =>
+		HttpResponse.json(resource([])),
+	),
 	http.get("*/api/v1/brokerage-accounts/:accountId/portfolio", () =>
-		HttpResponse.json({
-			lastSuccessfulAt: "2026-08-14T00:00:00Z",
-			isStale: false,
-			totalsByCurrency: [],
-			positions: [],
-			structure: { currencies: [], unvaluedCategories: [] },
-			cashBalances: [],
-		}),
+		HttpResponse.json(
+			resource({
+				lastSuccessfulAt: "2026-08-14T00:00:00Z",
+				isStale: false,
+				totalsByCurrency: [],
+				positions: [],
+				structure: { currencies: [], unvaluedCategories: [] },
+				cashBalances: [],
+			}),
+		),
 	),
 	http.get("*/api/v1/brokerage-accounts/:accountId/operations", () =>
-		HttpResponse.json({
-			accountId: "account-1",
-			items: [],
-			nextCursor: null,
-			hasNext: false,
-			observedAt: "2026-08-14T00:00:00Z",
-		}),
+		HttpResponse.json(
+			resource({
+				accountId: "account-1",
+				items: [],
+				nextCursor: null,
+				hasNext: false,
+				observedAt: "2026-08-14T00:00:00Z",
+			}),
+		),
 	),
 	http.get("*/api/v1/brokerage-accounts/:accountId/events", () =>
-		HttpResponse.json({
-			accountId: "account-1",
-			calculatedAt: "2026-08-14T00:00:00Z",
-			events: [],
-		}),
+		HttpResponse.json(
+			resource({
+				accountId: "account-1",
+				calculatedAt: "2026-08-14T00:00:00Z",
+				events: [],
+			}),
+		),
 	),
 	http.get("*/api/v1/brokerage-accounts/:accountId/income-summary", () =>
-		HttpResponse.json({
-			accountId: "account-1",
-			period: { from: "2026-01-01", to: "2026-08-14" },
-			totalsByCurrency: [],
-			calculatedAt: "2026-08-14T00:00:00Z",
-		}),
+		HttpResponse.json(
+			resource({
+				accountId: "account-1",
+				period: { from: "2026-01-01", to: "2026-08-14" },
+				totalsByCurrency: [],
+				calculatedAt: "2026-08-14T00:00:00Z",
+			}),
+		),
 	),
 ];