Replace light/dark package icons with single SVG

Consolidated the package command icon to a single SVG file and updated package.json to reference the new icon. Removed the separate light and dark icon files to simplify icon management.

Author: Mqxx

package.json

@@ -47,10 +47,7 @@
         "command": "extension.newPackage",
         "title": "New Package...",
         "category": "Explorer",
-        "icon": {
-          "light": "resources/icons/package_light.svg",
-          "dark": "resources/icons/package_dark.svg"
-        }
+        "icon": "resources/icons/package.svg"
       }
     ],
     "menus": {