feat(cms): implement structured tuition data normalization and editor

Refactor tuition data from a simple numeric array to a structured object
containing time labels and values. This allows for more flexible
charting and precise data entry in the CMS.
- Add `normalizeTuition`, `normalizeTuitionSeries`, and `normalizeTuitionPoint` to `admissionsController.js`
- Update `admissionsConfig.js` to use `objectList` for tuition data points instead of `stringList`
- Migrate existing tuition data in `admissions.json` to the new structured format
- Fix duplicate text in `admissions.json` grant amounts and descriptions

utils/contentEditors/admissionsConfig.js

@@ -114,12 +114,30 @@ module.exports = {
           [
             text("label", "Series label", { maxLength: 40 }),
             { key: "color", label: "Series color", type: "color" },
-            stringList("values", "Data points", {
-              itemLabel: "Point",
-              fieldType: "number",
-              min: 0,
-              sortable: true,
-            }),
+            objectList(
+              "points",
+              "Data points",
+              [
+                text("time", "Time label", {
+                  maxLength: 30,
+                  placeholder: "Year 1",
+                }),
+                {
+                  key: "value",
+                  label: "Value",
+                  type: "number",
+                  min: 0,
+                },
+              ],
+              {
+                itemLabel: "Point",
+                sortable: true,
+                itemTitleKey: "time",
+                itemSubtitleKey: "value",
+                helpText: "Each chart point requires both a time label and a numeric value.",
+                emptyText: "No data points yet.",
+              },
+            ),
           ],
           {
             itemLabel: "Series",