refactor: extract overlay visibility and ipc helper services

src/core/utils/notification.ts

@@ -0,0 +1,55 @@
+import { Notification, nativeImage } from "electron";
+import * as fs from "fs";
+
+export function showDesktopNotification(
+  title: string,
+  options: { body?: string; icon?: string },
+): void {
+  const notificationOptions: {
+    title: string;
+    body?: string;
+    icon?: Electron.NativeImage | string;
+  } = { title };
+
+  if (options.body) {
+    notificationOptions.body = options.body;
+  }
+
+  if (options.icon) {
+    const isFilePath =
+      typeof options.icon === "string" &&
+      (options.icon.startsWith("/") || /^[a-zA-Z]:[\\/]/.test(options.icon));
+
+    if (isFilePath) {
+      if (fs.existsSync(options.icon)) {
+        notificationOptions.icon = options.icon;
+      } else {
+        console.warn("Notification icon file not found:", options.icon);
+      }
+    } else if (
+      typeof options.icon === "string" &&
+      options.icon.startsWith("data:image/")
+    ) {
+      const base64Data = options.icon.replace(/^data:image\/\w+;base64,/, "");
+      try {
+        const image = nativeImage.createFromBuffer(
+          Buffer.from(base64Data, "base64"),
+        );
+        if (image.isEmpty()) {
+          console.warn(
+            "Notification icon created from base64 is empty - image format may not be supported by Electron",
+          );
+        } else {
+          notificationOptions.icon = image;
+        }
+      } catch (err) {
+        console.error("Failed to create notification icon from base64:", err);
+      }
+    } else {
+      notificationOptions.icon = options.icon;
+    }
+  }
+
+  const notification = new Notification(notificationOptions);
+  notification.show();
+}