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.

views/admin/partnerships/partials/directory-tab.ejs

@@ -5,14 +5,10 @@
     </div>
     <div class="card-body p-4">
       <div class="row g-3 mb-4">
-        <div class="col-md-8">
+        <div class="col-12">
           <label class="form-label fw-semibold">Section heading</label>
           <input class="form-control" id="directoryHeading" maxlength="70" value="<%= data.directory?.heading || '' %>">
         </div>
-        <div class="col-md-4">
-          <label class="form-label fw-semibold">Load more button label</label>
-          <input class="form-control" id="directoryLoadMoreLabel" maxlength="40" value="<%= data.directory?.loadMoreLabel || '' %>">
-        </div>
         <div class="col-12">
           <label class="form-label fw-semibold">Section description</label>
           <textarea class="form-control" id="directoryDescription" rows="3" maxlength="180"><%= data.directory?.description || '' %></textarea>
@@ -36,7 +32,7 @@
         <div class="mb-3">
           <div>
             <label class="form-label fw-semibold mb-1">Partners</label>
-            <div class="form-text mt-0">Use a short unique partner key so card state stays stable.</div>
+          <div class="form-text mt-0">Each partner card keeps its own open or closed state automatically.</div>
           </div>
         </div>
         <div id="partnersList"></div>