Delete app data on Windows uninstall

Set `deleteAppDataOnUninstall: true` in the NSIS config so that
`%APPDATA%\{appName}` is automatically removed when a user uninstalls
the application. The underlying NSIS template already skips deletion
during updates (`${ifNot} ${isUpdated}`), so app data is preserved
when updating to a new version.

Without this flag, the app data directory persists after uninstall and
users have to find and delete it manually.

Author: igorgudelj

resources/electron/electron-builder.mjs

@@ -95,6 +95,7 @@ export default {
         shortcutName: '${productName}',
         uninstallDisplayName: '${productName}',
         createDesktopShortcut: 'always',
+        deleteAppDataOnUninstall: true,
     },
     protocols: {
         name: deepLinkProtocol,