feat: implement micro learning generation service with cached LLM content delivery and UI components

src/hooks/useMicroLearnings.js

@@ -1,4 +1,4 @@
-import { getOrGenerateMicroLearning, regenerateMicroLearning } from '../lib/microLearningService';
+import { getOrGenerateMicroLearning, regenerateMicroLearning, getExistingTypes } from '../lib/microLearningService';
 
 export function useMicroLearnings() {
   /**
@@ -16,5 +16,13 @@ export function useMicroLearnings() {
     return regenerateMicroLearning(topicId, type);
   };
 
-  return { getOrGenerate, regenerate };
+  /**
+   * Check which micro learning types already exist for a given topic.
+   * Returns { concept_explainer: true, scenario_quiz: false, ... }
+   */
+  const checkExistingTypes = async (topicId) => {
+    return getExistingTypes(topicId);
+  };
+
+  return { getOrGenerate, regenerate, checkExistingTypes };
 }