feat: add learning_relevance field to topics and implement KnowledgeGraph UI with handbook synchronization capabilities

src/components/admin/KnowledgeGraph.jsx

@@ -299,8 +299,17 @@ Rules:
 3. Identify missing logical relations (depends_on, part_of, related_to) if two topics are conceptually linked but missing a relation.
 4. Return ONLY a valid JSON object describing the ACTIONS to take. Do not return the entire graph. Do not wrap in markdown blocks.`;
 
+      // Send a compact representation to minimize token usage and avoid rate limits.
+      // The AI only needs id, label, and type to identify duplicates/merges.
+      const compactTopics = currentTopics.map(({ id, label, type }) => ({ id, label, type }));
+      const compactRelations = currentRelations.map(r => ({
+        source: r.source?.id || r.source,
+        target: r.target?.id || r.target,
+        type: r.type
+      }));
+
       const userPrompt = `Here is the current knowledge graph:
-${JSON.stringify({ topics: currentTopics, relations: currentRelations }, null, 2)}
+${JSON.stringify({ topics: compactTopics, relations: compactRelations })}
 
 Analyze this graph and return ONLY the optimized JSON object with this EXACT structure:
 {