12.1.1 - 2026-10-12

Improvements

• AIChat QueueMessages accepts messages sent while an answer streams instead of ignoring them: the message shows right away marked as queued, is sent when the answer completes, and Stop returns its text to the box. A service can take such a message mid-response through IAIChatService.TryQueueMessageAsync or an IChatMessageQueue its chat client exposes via GetService; a user-role ChatResponseUpdate with the message id tells the chat the model read it, which moves the message under the answer so far and starts a new assistant message. The send button stays next to the stop button while streaming.
• AIChat HeaderTemplate, InputHeaderTemplate and InputFooterTemplate slots for a conversation switcher, status line, model picker or action buttons around the conversation and the input.
• AIChat @bind-Input reads and sets the text in the box, FocusAsync focuses it.
• AIChat Text and tool calls of an answer keep the order the model produced them; ChatToolCall.TextPosition and ChatMessage.GetParts() expose it for custom templates.
• AIChat ChatMessage.Kind with Status, Progress and Error entries rendered as a centered note, a spinner line and an alert; AddMessage(ChatMessage), RemoveMessage and Refresh manage them. RenderMessage renders a message the default way from inside MessageTemplate.
• AIChat ShowAvatars, SendButtonText, SendButtonIcon, StopButtonText and StopButtonIcon.
• AIChat AttachmentAdding receives every picked file and can cancel or replace it, for example with a scaled down image; MaxTotalAttachmentSize limits the attachments of a message as a whole.
• AIChat UsageTemplate and MessageFooterTemplate render usage and extra content per message; ChatMessage.AdditionalProperties collects the AdditionalProperties of the streamed updates, for example credits or changed files.
• AIChat The conversation store saves messages a service takes mid-response in the order the chat showed them, under the same ids.

Fixes

• AIChat The streaming placeholder rendered as a finished message until the first token arrived.
• AIChat In right-to-left layouts the whole send button was mirrored instead of only its icon.