fix(settings): add category subfolders toggle

Add a Settings > Locations toggle that disables automatic category subfolders while keeping the selected base download folder as the automatic destination.

Persist the setting across frontend and backend startup paths and disable the category subfolder controls when the feature is off.

Fixes #6

src/store/useDownloadStore.test.ts

@@ -36,6 +36,7 @@ vi.mock('./useSettingsStore', () => ({
       maxAutomaticRetries: 3,
       mediaCookieSource: 'none',
       baseDownloadFolder: '~/Downloads',
+      categorySubfoldersEnabled: true,
       categorySubfolders: {
         Musics: 'Musics',
         Movies: 'Movies',

src/store/useSettingsStore.ts

@@ -73,6 +73,7 @@ export type {
 export interface SettingsState {
   theme: Theme;
   baseDownloadFolder: string;
+  categorySubfoldersEnabled: boolean;
   categorySubfolders: Record<string, string>;
   categoryDirectoryOverrides: Record<string, string>;
   approvedDownloadRoots: string[];
@@ -145,6 +146,7 @@ export interface SettingsState {
   setAskWhereToSaveEachFile: (ask: boolean) => void;
   setPreventsSleepWhileDownloading: (prevent: boolean) => void;
   setMediaCookieSource: (source: MediaCookieSource) => void;
+  setCategorySubfoldersEnabled: (enabled: boolean) => void;
   setCategorySubfolder: (category: string, subfolder: string) => void;
   setCategoryDirectoryOverride: (category: string, path?: string) => void;
   resetCategoryLocations: () => void;
@@ -187,6 +189,7 @@ export const useSettingsStore = create<SettingsState>()(
     (set, _get) => ({
       theme: 'system',
       baseDownloadFolder: '~/Downloads',
+      categorySubfoldersEnabled: true,
       categorySubfolders: { ...DEFAULT_CATEGORY_SUBFOLDERS },
       categoryDirectoryOverrides: {},
       approvedDownloadRoots: [],
@@ -295,6 +298,10 @@ export const useSettingsStore = create<SettingsState>()(
         set({ preventsSleepWhileDownloading });
       },
       setMediaCookieSource: (mediaCookieSource) => { info('Settings updated: mediaCookieSource'); set({ mediaCookieSource }); },
+      setCategorySubfoldersEnabled: (categorySubfoldersEnabled) => {
+        info('Settings updated: categorySubfoldersEnabled');
+        set({ categorySubfoldersEnabled });
+      },
       setCategorySubfolder: (category, subfolder) => {
         info(`Settings updated: category subfolder ${category}`);
         set((state) => ({
@@ -385,6 +392,7 @@ export const useSettingsStore = create<SettingsState>()(
       partialize: (state): PersistedSettings => ({
         theme: state.theme,
         baseDownloadFolder: state.baseDownloadFolder,
+        categorySubfoldersEnabled: state.categorySubfoldersEnabled,
         categorySubfolders: state.categorySubfolders,
         categoryDirectoryOverrides: state.categoryDirectoryOverrides,
         approvedDownloadRoots: state.approvedDownloadRoots,