feat(notifications): add overlay notifications with position config (#110)

src/main/runtime/notification-routing.ts

@@ -0,0 +1,20 @@
+import type { NotificationType } from '../../types/notification';
+
+export function shouldShowOsd(type: NotificationType): boolean {
+  return type === 'osd' || type === 'osd-system';
+}
+
+export function shouldShowOverlay(type: NotificationType): boolean {
+  return type === 'overlay' || type === 'both';
+}
+
+export function shouldShowDesktop(type: NotificationType): boolean {
+  return type === 'system' || type === 'both' || type === 'osd-system';
+}
+
+export function resolveOverlayReadinessNotificationType(
+  type: NotificationType,
+  _overlayReady: boolean,
+): NotificationType {
+  return type;
+}