feat: enforce tenant isolation and shared question bank

Tiku.Application/Learning/LearningActivityModels.cs

@@ -1,6 +1,7 @@
 using System.Text.Json;
 using Tiku.Domain.Content;
 using Tiku.Domain.Learning;
+using Tiku.Application.QuestionBanks;
 
 namespace Tiku.Application.Learning;
 
@@ -9,13 +10,12 @@ public sealed record LearningActor(Guid TenantId, Guid UserId);
 public sealed record LearningList<TItem>(IReadOnlyCollection<TItem> Items);
 
 public sealed record SubmitAnswerCommand(
-    Guid QuestionId,
-    Guid? PracticeSessionId,
+    Guid SessionQuestionId,
     IReadOnlyCollection<string>? SelectedOptions,
     string? AnswerText,
     bool? SelfJudgedCorrect);
 
-public sealed record QuestionActionCommand(Guid QuestionId, bool? Favorite);
+public sealed record QuestionActionCommand(QuestionLocator Locator, bool? Favorite);
 
 public sealed record WordProgressCommand(
     Guid WordId,
@@ -55,7 +55,11 @@ public sealed record LearningLeaderboardResult(
     LearningLeaderboardItem? CurrentUser,
     DateTimeOffset GeneratedAt);
 
-public sealed record WrongQuestionReviewPlanItem(Guid QuestionId, int WrongCount, DateTimeOffset LastWrongAt);
+public sealed record WrongQuestionReviewPlanItem(
+    Guid QuestionReferenceId,
+    QuestionLocator Locator,
+    int WrongCount,
+    DateTimeOffset LastWrongAt);
 
 public sealed record WrongQuestionReviewPlan(
     IReadOnlyCollection<WrongQuestionReviewPlanItem> Items,
@@ -106,21 +110,21 @@ public sealed record PracticeSessionFilter(
 
 public sealed record AnswerRecordItem(
     Guid Id,
-    Guid QuestionId,
-    Guid? QuestionVersionId,
-    Guid? PracticeSessionId,
+    Guid SessionQuestionId,
+    Guid PracticeSessionId,
     JsonElement SelectedOptions,
     string? AnswerText,
     bool? IsCorrect,
     DateTimeOffset AnsweredAt);
 
 public sealed record FavoriteQuestionItem(
-    Guid QuestionId,
-    string Source,
+    Guid QuestionReferenceId,
+    QuestionLocator Locator,
     DateTimeOffset CreatedAt);
 
 public sealed record WrongQuestionItem(
-    Guid QuestionId,
+    Guid QuestionReferenceId,
+    QuestionLocator Locator,
     int WrongCount,
     DateTimeOffset LastWrongAt,
     DateTimeOffset? ResolvedAt);
@@ -154,7 +158,6 @@ public sealed record PracticeSessionItem(
     Guid? CollectionId,
     Guid? EntryId,
     Guid? ContentNodeId,
-    JsonElement QuestionIds,
     int QuestionCount,
     int? DurationMinutes,
     decimal? TotalScore,
@@ -171,10 +174,13 @@ public sealed record PracticeSessionItem(
 public sealed record PracticeSessionDetailItem(
     PracticeSessionItem Session,
     IReadOnlyCollection<PracticeSessionQuestionItem> Questions,
-    IReadOnlyDictionary<Guid, AnswerRecordItem> AnswersByQuestion);
+    IReadOnlyDictionary<Guid, AnswerRecordItem> AnswersBySessionQuestion);
 
 public sealed record PracticeSessionQuestionItem(
-    Guid Id,
+    Guid SessionQuestionId,
+    Guid QuestionReferenceId,
+    QuestionLocator Locator,
+    Guid QuestionId,
     string Type,
     string? TypeLabel,
     int? Difficulty,