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.

data/policies.json

@@ -5,7 +5,7 @@
     "titlePrefix": "Our Commitment to",
     "titleHighlight": "Transparency",
     "description": "Review our policies, terms of service, and commitments to privacy and accessibility. We believe in clear, straightforward communication with our academic community.",
-    "lastUpdated": "Last updated: April 20, 2026"
+    "lastUpdated": "Last updated: April 21, 2026"
   },
   "sidebar": {
     "heading": "Policies",
@@ -173,6 +173,14 @@
           ]
         }
       ]
+    },
+    {
+      "navLabel": "hehehe",
+      "title": "hehehe",
+      "effectiveDate": "hehehe",
+      "intro": "hehehe",
+      "id": "hehehe",
+      "sections": []
     }
   ]
 }