feat(cefr): dual mistake ingestion, 1-tap options breakdown, and 260 curated questions

app/static/js/modules/api.js

@@ -247,6 +247,19 @@ export const api = {
             });
             if (resp.ok) return await resp.json();
             throw new Error(`Failed to reset level: ${resp.status}`);
+        },
+        async addWord(level, term, contextSentence = '') {
+            const resp = await fetch('/api/cefr/add-word', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({
+                    level: level,
+                    term: term,
+                    context_sentence: contextSentence
+                })
+            });
+            if (resp.ok) return await resp.json();
+            throw new Error(`Failed to add word: ${resp.status}`);
         }
     },