fix(ui): export kDefaultMaxAttachmentSize and use it in StreamAttachmentPicker default, also increase it to 100Mb

packages/stream_chat_flutter/lib/src/message_input.dart

@@ -110,7 +110,8 @@ enum SendButtonLocation {
 
 const _kMinMediaPickerSize = 360.0;
 
-const _kDefaultMaxAttachmentSize = 20971520; // 20MB in Bytes
+/// Default maximum size for media attachments.
+const kDefaultMaxAttachmentSize = 1024 * 1024 * 100; // 100MB in Bytes
 
 /// Inactive state
 ///
@@ -188,7 +189,7 @@ class MessageInput extends StatefulWidget {
     @Deprecated('''Use `userMentionsTileBuilder` instead. Will be removed in future release''')
         this.mentionsTileBuilder,
     this.userMentionsTileBuilder,
-    this.maxAttachmentSize = _kDefaultMaxAttachmentSize,
+    this.maxAttachmentSize = kDefaultMaxAttachmentSize,
     this.onError,
     this.attachmentLimit = 10,
     this.onAttachmentLimitExceed,

packages/stream_chat_flutter/lib/src/v4/message_input/stream_attachment_picker.dart

@@ -32,7 +32,7 @@ class StreamAttachmentPicker extends StatefulWidget {
     this.pickerSize = 360.0,
     this.attachmentLimit = 10,
     this.onAttachmentLimitExceeded,
-    this.maxAttachmentSize = 20971520,
+    this.maxAttachmentSize = kDefaultMaxAttachmentSize,
     this.onError,
     this.allowedAttachmentTypes = const [
       DefaultAttachmentTypes.image,

packages/stream_chat_flutter/lib/src/v4/message_input/stream_message_input.dart

@@ -128,7 +128,8 @@ enum SendButtonLocation {
 
 const _kMinMediaPickerSize = 360.0;
 
-const _kDefaultMaxAttachmentSize = 20971520; // 20MB in Bytes
+/// Default maximum size for media attachments.
+const kDefaultMaxAttachmentSize = 1024 * 1024 * 100; // 100MB in Bytes
 
 /// Inactive state:
 ///