feat: add learning objective targets

src/export/site.rs

@@ -803,7 +803,7 @@ items:
     level: 2
     format: single_best_answer
     stem: "The heat at constant pressure equals a change in what?"
-    learning_objectives: [lo-enthalpy]
+    learning_targets: [lo-enthalpy]
     options:
       - { id: A, text: "Enthalpy, $\\Delta H$", correct: true, feedback_student: "Right, $q_p = \\Delta H$." }
       - { id: B, text: "Internal energy, $\\Delta U$", misconception: "Uses the constant-volume result.", explanation: "That holds only at constant volume." }
@@ -816,7 +816,7 @@ items:
     level: 3
     format: open_response
     stem: "Show why $q_p = \\Delta H$."
-    learning_objectives: [lo-enthalpy]
+    learning_targets: [lo-enthalpy]
     solution:
       model_answer: "From $H = U + PV$ at constant pressure, $q_p = \\Delta H$."
       explanation: |
@@ -863,7 +863,7 @@ items:
                     bonus: false,
                     key: vec!["A".into()],
                     level: None,
-                    learning_objectives: Vec::new(),
+                    learning_targets: Vec::new(),
                     credit_overrides: Default::default(),
                     dropped: false,
                     dropped_as: None,
@@ -877,7 +877,7 @@ items:
                     bonus: false,
                     key: Vec::new(),
                     level: None,
-                    learning_objectives: Vec::new(),
+                    learning_targets: Vec::new(),
                     credit_overrides: Default::default(),
                     dropped: false,
                     dropped_as: None,