feat(cms): enhance content editors and implement automatic ID generation

Improve the CMS administration interface across multiple pages (Accreditation, Admissions, History, Partnerships, and Policies) with a focus on usability and data integrity.
Key changes include:
- Implement `ensureUniqueIds` utility to automatically generate and maintain unique slugs for content items, removing the need for manual ID entry in the UI.
- Refactor the Admissions calculator to support detailed per-option editing via a new dedicated view and routes.
- Replace basic datalists with a custom, searchable icon combobox component for better visual selection.
- Update `_renderSingletonPageView` to handle active tab persistence via query parameters.
- Streamline editor configurations by removing redundant fields and improving help text.
- Enhance the Admissions "Key Dates" editor with a dynamic table interface for managing columns and rows.
- Normalize data payloads in controllers to ensure consistent API responses and internal linking.

routes/admin.js

@@ -77,6 +77,16 @@ router.post(
   accreditationController.update,
 );
 router.get("/admissions", ensureAuthenticated, admissionsController.index);
+router.get(
+  "/admissions/calculator/:optionId",
+  ensureAuthenticated,
+  admissionsController.editCalculatorOption,
+);
+router.post(
+  "/admissions/calculator/:optionId/update",
+  ensureAuthenticated,
+  admissionsController.updateCalculatorOption,
+);
 router.post(
   "/admissions/update",
   ensureAuthenticated,