feat: interactive oracle session chat and dynamic draw additional d10 cards for context refinement

lib/models/history_entry_model.dart

@@ -48,6 +48,40 @@ class SessionWord {
       );
 }
 
+class SessionChatMessage {
+  final String id;
+  final String sender; // 'user' | 'oracle' | 'system'
+  final String text;
+  final DateTime timestamp;
+  final SessionWord? attachedWord;
+
+  const SessionChatMessage({
+    required this.id,
+    required this.sender,
+    required this.text,
+    required this.timestamp,
+    this.attachedWord,
+  });
+
+  Map<String, dynamic> toMap() => {
+        'id': id,
+        'sender': sender,
+        'text': text,
+        'timestamp': timestamp.toIso8601String(),
+        if (attachedWord != null) 'attachedWord': attachedWord!.toMap(),
+      };
+
+  factory SessionChatMessage.fromMap(Map<String, dynamic> map) => SessionChatMessage(
+        id: map['id'] as String? ?? '',
+        sender: map['sender'] as String? ?? 'oracle',
+        text: map['text'] as String? ?? '',
+        timestamp: DateTime.tryParse(map['timestamp'] as String? ?? '') ?? DateTime.now(),
+        attachedWord: map['attachedWord'] != null
+            ? SessionWord.fromMap(map['attachedWord'] as Map<String, dynamic>)
+            : null,
+      );
+}
+
 class OracleSession {
   final String id;
   final DateTime timestamp;
@@ -55,6 +89,7 @@ class OracleSession {
   final int wordsCount;
   final List<SessionWord> words;
   final String? aiInterpretation;
+  final List<SessionChatMessage> messages;
 
   const OracleSession({
     required this.id,
@@ -63,6 +98,7 @@ class OracleSession {
     required this.wordsCount,
     required this.words,
     this.aiInterpretation,
+    this.messages = const [],
   });
 
   OracleSession copyWith({
@@ -72,6 +108,7 @@ class OracleSession {
     int? wordsCount,
     List<SessionWord>? words,
     String? aiInterpretation,
+    List<SessionChatMessage>? messages,
   }) {
     return OracleSession(
       id: id ?? this.id,
@@ -80,6 +117,7 @@ class OracleSession {
       wordsCount: wordsCount ?? this.wordsCount,
       words: words ?? this.words,
       aiInterpretation: aiInterpretation ?? this.aiInterpretation,
+      messages: messages ?? this.messages,
     );
   }
 
@@ -100,6 +138,7 @@ class OracleSession {
         'wordsCount': wordsCount,
         'words': words.map((w) => w.toMap()).toList(),
         if (aiInterpretation != null) 'aiInterpretation': aiInterpretation,
+        'messages': messages.map((m) => m.toMap()).toList(),
       };
 
   factory OracleSession.fromMap(Map<String, dynamic> map) {
@@ -113,6 +152,10 @@ class OracleSession {
               .toList() ??
           [],
       aiInterpretation: map['aiInterpretation'] as String?,
+      messages: (map['messages'] as List<dynamic>?)
+              ?.map((item) => SessionChatMessage.fromMap(item as Map<String, dynamic>))
+              .toList() ??
+          [],
     );
   }
 
@@ -120,5 +163,4 @@ class OracleSession {
   factory OracleSession.fromJson(String source) => OracleSession.fromMap(jsonDecode(source));
 }
 
-// Backward compatibility alias
 typedef HistoryEntry = OracleSession;