fix(vocab): never hide due batch behind zero quota

frontend/src/views/social/VocabCourseView.vue

@@ -455,13 +455,16 @@ export default {
     srsDailyCount() {
       // A valid current-day session represents the fixed daily batch. Without
       // one, the server's due count determines the first batch (max. 50).
-      if (Number.isFinite(Number(this.srsTodayRemaining))) {
+      // A zero-card session is never a valid batch while the server still
+      // reports due items. Otherwise the UI can incorrectly show "0 of 0"
+      // even though there is a backlog to start today.
+      if (this.srsDailyQuota > 0 && Number.isFinite(Number(this.srsTodayRemaining))) {
         return Math.max(0, Number(this.srsTodayRemaining));
       }
       return Math.min(this.srsDueCount, this.srsDailyLimit);
     },
     srsDailyQuota() {
-      if (Number.isFinite(Number(this.srsTodayQuota))) {
+      if (Number.isFinite(Number(this.srsTodayQuota)) && Number(this.srsTodayQuota) > 0) {
         return Math.max(0, Number(this.srsTodayQuota));
       }
       return Math.min(this.srsDueCount, this.srsDailyLimit);
@@ -1028,7 +1031,10 @@ export default {
         onClose: () => this.refreshHardVocabList()
       });
     },
-    openSrsPractice() {
+    async openSrsPractice() {
+      // Refresh immediately before opening. The status dialog may have been
+      // opened while a stale empty session was still in local storage.
+      await this.loadSrsDueItems();
       if (!this.srsDueItems.length) {
         return;
       }