feat(editor): настройки экрана презентации при запуске сессии

Выбор монитора и полноэкранного режима в настройках; при «Запустить» окно презентации открывается на выбранном дисплее автоматически.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/main/preferences/appPreferences.test.ts

@@ -0,0 +1,33 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+import { readPresentationSettings, writePresentationSettings } from './appPreferences';
+
+void test('appPreferences: presentation settings round-trip without clobbering eula', () => {
+  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'dnd-prefs-'));
+  const prefsPath = path.join(dir, 'preferences.json');
+  fs.writeFileSync(prefsPath, `${JSON.stringify({ eulaAcceptedVersion: 2 }, null, 2)}\n`, 'utf8');
+
+  writePresentationSettings(dir, { displayId: 42, fullScreen: false });
+  const loaded = readPresentationSettings(dir);
+  assert.equal(loaded.displayId, 42);
+  assert.equal(loaded.fullScreen, false);
+
+  const raw = JSON.parse(fs.readFileSync(prefsPath, 'utf8')) as {
+    eulaAcceptedVersion?: number;
+    presentation?: { displayId: number | null; fullScreen: boolean };
+  };
+  assert.equal(raw.eulaAcceptedVersion, 2);
+  assert.equal(raw.presentation?.displayId, 42);
+  assert.equal(raw.presentation?.fullScreen, false);
+});
+
+void test('appPreferences: defaults when preferences missing', () => {
+  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'dnd-prefs-'));
+  const loaded = readPresentationSettings(dir);
+  assert.equal(loaded.displayId, null);
+  assert.equal(loaded.fullScreen, true);
+});