feat: PDF and document file viewing support

Matthias Nott

3 days ago cda5ac96c4802f7c33f8f0099a8c9c34423dde4a

 lib/models/message.dart
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@@ -13,6 +13,7 @@
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   final String content;
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   final String? audioUri;
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   final String? imageBase64;
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+  final String? mimeType;
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   final int timestamp;
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   final MessageStatus? status;
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   final int? duration;
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@@ -25,6 +26,7 @@
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     required this.timestamp,
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     this.audioUri,
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     this.imageBase64,
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+    this.mimeType,
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     this.status,
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     this.duration,
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   });
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@@ -67,6 +69,7 @@
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     required MessageRole role,
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     required String imageBase64,
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     String content = '',
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+    String? mimeType,
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     MessageStatus? status,
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   }) {
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     return Message(
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@@ -75,6 +78,7 @@
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       type: MessageType.image,
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       content: content,
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       imageBase64: imageBase64,
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+      mimeType: mimeType,
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       timestamp: DateTime.now().millisecondsSinceEpoch,
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       status: status,
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     );
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@@ -84,6 +88,7 @@
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     String? content,
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     String? audioUri,
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     String? imageBase64,
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+    String? mimeType,
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     MessageStatus? status,
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     int? duration,
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   }) {
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@@ -94,6 +99,7 @@
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       content: content ?? this.content,
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       audioUri: audioUri ?? this.audioUri,
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       imageBase64: imageBase64 ?? this.imageBase64,
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+      mimeType: mimeType ?? this.mimeType,
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       timestamp: timestamp,
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       status: status ?? this.status,
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       duration: duration ?? this.duration,
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@@ -108,6 +114,7 @@
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       'content': content,
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       if (audioUri != null) 'audioUri': audioUri,
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       if (imageBase64 != null) 'imageBase64': imageBase64,
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+      if (mimeType != null) 'mimeType': mimeType,
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       'timestamp': timestamp,
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       if (status != null) 'status': status!.name,
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       if (duration != null) 'duration': duration,
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@@ -130,6 +137,7 @@
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       if (duration != null) 'duration': duration,
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       // Keep imageBase64 — images are typically 50-200 KB and must survive restart.
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       if (imageBase64 != null) 'imageBase64': imageBase64,
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+      if (mimeType != null) 'mimeType': mimeType,
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     };
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   }
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@@ -141,6 +149,7 @@
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       content: json['content'] as String? ?? '',
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       audioUri: json['audioUri'] as String?,
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       imageBase64: json['imageBase64'] as String?,
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+      mimeType: json['mimeType'] as String?,
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       timestamp: json['timestamp'] as int,
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       status: json['status'] != null
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           ? MessageStatus.values.byName(json['status'] as String)