Add survey question drag-sort and backend assets

- Frontend editor: drag-to-sort questions with dedicated sort assets/JS
- Backend list/search refinements for tl_survey and tl_survey_content
- Repository helpers for survey/question/editor queries
- Translations and AI handover notes update

public/css/survey-backend.css

@@ -0,0 +1,45 @@
+.tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
+    column-count: 4;
+    column-gap: 1.5rem;
+}
+
+.tl_checkbox_wizard.survey-assigned-members-checkbox-wizard > span {
+    display: block;
+    break-inside: avoid;
+    margin-bottom: 0.35rem;
+}
+
+.tl_checkbox_wizard.survey-assigned-members-checkbox-wizard .drag-handle {
+    display: none;
+}
+
+.tl_checkbox_wizard.survey-assigned-members-checkbox-wizard label {
+    display: inline;
+    white-space: normal;
+}
+
+body.survey-question-list-page .parent_view > .tl_header .tl_content_right {
+    display: none;
+}
+
+body.survey-question-list-page.survey-question-list-clipboard-active .parent_view > .tl_header .tl_content_right {
+    display: block;
+}
+
+@media (max-width: 1400px) {
+    .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
+        column-count: 3;
+    }
+}
+
+@media (max-width: 1100px) {
+    .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
+        column-count: 2;
+    }
+}
+
+@media (max-width: 767px) {
+    .tl_checkbox_wizard.survey-assigned-members-checkbox-wizard {
+        column-count: 1;
+    }
+}