fix anime-settings: correct UI module name (UiUtils → UI), update tests with proper selectors

- AniWorld.UiUtils → AniWorld.UI for toast notifications
- Update robot tests to use actual element IDs (settings-section, save-db-btn, field-folder)
- Fix anime key format in test URLs (Attack on Titan - Season 1)
- Remove completed Task 22 from Docs/tasks.md

src/server/web/static/js/pages/anime-settings.js

@@ -544,8 +544,8 @@ AniWorld.AnimeSettingsManager = (function () {
      * Show a success toast via shared UI utilities.
      */
     function showSaveSuccess(msg) {
-        if (AniWorld.UiUtils && AniWorld.UiUtils.showToast) {
-            AniWorld.UiUtils.showToast(msg, 'success');
+        if (AniWorld.UI && AniWorld.UI.showToast) {
+            AniWorld.UI.showToast(msg, 'success');
         } else {
             console.info('[AnimeSettings] ' + msg);
         }
@@ -555,8 +555,8 @@ AniWorld.AnimeSettingsManager = (function () {
      * Show an error toast via shared UI utilities.
      */
     function showError(msg) {
-        if (AniWorld.UiUtils && AniWorld.UiUtils.showToast) {
-            AniWorld.UiUtils.showToast(msg, 'error');
+        if (AniWorld.UI && AniWorld.UI.showToast) {
+            AniWorld.UI.showToast(msg, 'error');
         } else {
             console.error('[AnimeSettings] ' + msg);
         }