refactor: consolidate the assistant bubble display

[jjleng]

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[Copilot]

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Comments suppressed due to low confidence (2)

cp-webapp/src/components/chat/index.tsx:239

• Add tests to cover the scenario where the last assistant message is empty and streaming is canceled to ensure the message is correctly skipped in the mapping logic.

if (isLastAssistantMessage && !message.content && wasCanceled) {

cp-webapp/src/components/chat/index.tsx:277

• Add tests for the canceled message bubble conditions to ensure that when there are no messages, the last message is not from the assistant, or the assistant message is empty, the canceled bubble renders correctly.

const showCanceledMessage = wasCanceled && (!messages.length || messages[messages.length - 1].role !== 'assistant' || !messages[messages.length - 1].content);