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.

controllers/_renderSingletonPageView.js

@@ -11,6 +11,11 @@ function createRenderSingletonPageView({
     const frontendUrl = process.env.FRONTEND_URL || "http://localhost:3000";
     const backendUrl =
       process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
+    const defaultTab = editorConfig.tabs[0]?.key;
+    const requestedTab = req.query.tab;
+    const activeTab = editorConfig.tabs.some((tab) => tab.key === requestedTab)
+      ? requestedTab
+      : defaultTab;
 
     return res.render(view, {
       layout: "layouts/main",
@@ -18,7 +23,7 @@ function createRenderSingletonPageView({
       subtitle: editorConfig.subtitle,
       data,
       editorConfig,
-      activeTab: req.query.tab || editorConfig.tabs[0].key,
+      activeTab,
       frontendUrl,
       backendUrl,
       previewUrl: `${frontendUrl}${editorConfig.previewPath}`,