feat(icon): update application icon and references

- Changed application icon from `icon_gold.png` to `logo.png` across package.json, main.js, and relevant components.
- Updated image source paths in Sidebar and WelcomeView components to reflect the new logo file.

This update standardizes the icon used throughout the application, enhancing visual consistency.

app/electron/main.js

@@ -12,11 +12,11 @@ let mainWindow = null;
 
 // Get icon path - works in both dev and production
 function getIconPath() {
-  // In dev: __dirname is electron/, so ../public/icon_gold.png
+  // In dev: __dirname is electron/, so ../public/logo.png
   // In production: public folder is included in the app bundle
   return app.isPackaged
-    ? path.join(process.resourcesPath, "app", "public", "icon_gold.png")
-    : path.join(__dirname, "../public/icon_gold.png");
+    ? path.join(process.resourcesPath, "app", "public", "logo.png")
+    : path.join(__dirname, "../public/logo.png");
 }
 
 function createWindow() {
@@ -193,7 +193,9 @@ ipcMain.handle(
       await fs.mkdir(imagesDir, { recursive: true });
 
       // Generate unique filename with unique ID
-      const uniqueId = `${Date.now()}-${Math.random().toString(36).substring(2, 11)}`;
+      const uniqueId = `${Date.now()}-${Math.random()
+        .toString(36)
+        .substring(2, 11)}`;
       const safeName = filename.replace(/[^a-zA-Z0-9.-]/g, "_");
       const imageFilePath = path.join(imagesDir, `${uniqueId}_${safeName}`);