refactor: improve editor and cuesheet headers

- consistent behaviour for app mode
- improve navigation

apps/client/src/common/stores/appModeStore.ts

@@ -1,32 +0,0 @@
-import { create } from 'zustand';
-
-export enum AppMode {
-  Run = 'run',
-  Edit = 'edit',
-}
-
-const appModeKey = 'ontime-app-mode';
-
-function getModeFromSession() {
-  return sessionStorage.getItem(appModeKey) === AppMode.Run ? AppMode.Run : AppMode.Edit;
-}
-
-function persistModeToSession(mode: AppMode) {
-  sessionStorage.setItem(appModeKey, mode);
-}
-
-type AppModeStore = {
-  mode: AppMode;
-  setMode: (mode: AppMode) => void;
-};
-
-export const useAppMode = create<AppModeStore>()((set) => ({
-  mode: getModeFromSession(),
-  setMode: (mode: AppMode) => {
-    persistModeToSession(mode);
-
-    return set(() => {
-      return { mode };
-    });
-  },
-}));