fix(accounts): refresh status before enabling accounts

Validate Real-Debrid, Mega-Debrid, and Debrid-Link accounts silently before exposing a newly enabled account to active downloads. Keep the row toggle optimistic, skip network checks while disabling, persist direct account-check results, and avoid the browser-login race for an already authenticated Real-Debrid web session.

tests/account-ui.test.ts

@@ -9,6 +9,7 @@ import {
   pruneAccountRowSelection,
   resolveAccountUsername,
   resolveVisibleAccountKind,
+  runAccountEnableRefresh,
   sortAccountServices
 } from "../src/renderer/account-ui";
 import * as accountUi from "../src/renderer/account-ui";
@@ -134,3 +135,27 @@ describe("account usernames", () => {
     expect(resolveAccountUsername("", undefined)).toBe("—");
   });
 });
+
+describe("account activation refresh", () => {
+  it("checks an account before enabling it", async () => {
+    const events: string[] = [];
+
+    await runAccountEnableRefresh(
+      async () => { events.push("check"); },
+      async () => { events.push("persist"); }
+    );
+
+    expect(events).toEqual(["check", "persist"]);
+  });
+
+  it("does not check an account while disabling it", async () => {
+    const events: string[] = [];
+
+    await runAccountEnableRefresh(
+      undefined,
+      async () => { events.push("persist"); }
+    );
+
+    expect(events).toEqual(["persist"]);
+  });
+});