fix(vocab): use authoritative hard vocabulary pool

frontend/src/dialogues/socialnetwork/VocabPracticeDialog.vue

@@ -445,7 +445,10 @@ export default {
     maybeFinishHardPhase() {
       if (!this.hardPhaseActive && !this.closeOnHardCompletion) return false;
       if (this.hardRemainingCount > 0) return false;
-      if (this.hardCount <= 0 && this.closeOnHardCompletion) {
+      // In the dedicated hard-vocabulary dialog, completion is determined by
+      // the supplied server list. Stale localStorage entries must not keep the
+      // dialog open after every actual hard item was cleared.
+      if (this.closeOnHardCompletion) {
         this.close();
         return true;
       }
@@ -610,11 +613,21 @@ export default {
       });
       this.loadHardVocabMap();
       if (Array.isArray(initialHardPool)) {
+        // The course view fetched this list from the SRS endpoint immediately
+        // before opening. It is authoritative; do not merge old local entries
+        // into it, otherwise the displayed count can exceed the real open set.
+        const authoritativeHardMap = {};
         initialHardPool.forEach((item) => {
           const key = this.getHardKey(item);
           if (!key || !item?.learning || !item?.reference) return;
-          this.hardVocabMap[key] = { learning: item.learning, reference: item.reference, itemKey: item.itemKey || item.id || null };
+          authoritativeHardMap[key] = {
+            learning: item.learning,
+            reference: item.reference,
+            itemKey: item.itemKey || item.id || null
+          };
         });
+        this.hardVocabMap = authoritativeHardMap;
+        this.saveHardVocabMap();
       }
       // This dialog is explicitly opened for the hard-vocabulary collection.
       // Its correct answers must therefore count towards releasing those items