feat: add automatic account cooldown recovery

Replace session-long account failure pauses with classified 15, 30, 60, and 120 minute cooldowns for temporary account problems. Keep credential, OTP, banned, and disabled states manual while ignoring unknown, file, network, hoster, and bare WAF errors. Reset escalation after confirmed uploads, deduplicate parallel failures, publish revisioned pause snapshots, and show a stable localized countdown with automatic reactivation.

tests/package-build-files.test.js

@@ -209,3 +209,47 @@ test('close readiness is signaled only after the renderer explicitly finishes in
     ['app:close-handshake-ready']
   ]);
 });
+
+test('preload exposes account cooldown snapshots and removes their listener during cleanup', async () => {
+  const listeners = new Map();
+  const invocations = [];
+  const removed = [];
+  let exposedApi = null;
+  const electronMock = {
+    contextBridge: {
+      exposeInMainWorld: (_name, api) => { exposedApi = api; }
+    },
+    ipcRenderer: {
+      invoke: (...args) => { invocations.push(args); return Promise.resolve({ version: 2, accounts: [] }); },
+      on: (channel, listener) => { listeners.set(channel, listener); },
+      send: () => {},
+      removeAllListeners: channel => { removed.push(channel); }
+    },
+    webUtils: {
+      getPathForFile: () => ''
+    }
+  };
+  const originalLoad = Module._load;
+  const preloadPath = require.resolve('../preload');
+  delete require.cache[preloadPath];
+  Module._load = function (request, parent, isMain) {
+    if (request === 'electron') return electronMock;
+    return originalLoad.call(this, request, parent, isMain);
+  };
+  try {
+    require(preloadPath);
+  } finally {
+    Module._load = originalLoad;
+  }
+
+  const snapshot = await exposedApi.getSessionFailedAccountStates();
+  let pushed = null;
+  exposedApi.onSessionFailedAccountsChanged(value => { pushed = value; });
+  listeners.get('session-failed-accounts-changed')({}, { version: 2, accounts: [{ accountId: 'a1' }] });
+  exposedApi.removeAllListeners();
+
+  assert.deepEqual(snapshot, { version: 2, accounts: [] });
+  assert.deepEqual(invocations, [['get-session-failed-account-states']]);
+  assert.deepEqual(pushed, { version: 2, accounts: [{ accountId: 'a1' }] });
+  assert.equal(removed.includes('session-failed-accounts-changed'), true);
+});