97 custom arguments broken (#99)

* golang debug

* handle template in playlist download

* code refactoring, dropped goccy go json

frontend/src/atoms/downloadTemplate.ts

@@ -6,4 +6,12 @@ export const downloadTemplateState = atom({
   effects: [
     ({ onSet }) => onSet(e => localStorage.setItem('lastDownloadTemplate', e))
   ]
+})
+
+export const filenameTemplateState = atom({
+  key: 'filenameTemplateState',
+  default: localStorage.getItem('lastFilenameTemplate') ?? '',
+  effects: [
+    ({ onSet }) => onSet(e => localStorage.setItem('lastFilenameTemplate', e))
+  ]
 })