Fix misleading JSDoc comment on copyAsPrompt() to match actual behavior

[Copilot]

The JSDoc comment above copyAsPrompt() claimed AI messages were wrapped with extra instructions before insertion, but the implementation inserts raw content unchanged for all message types.

Change

Updated the comment to accurately describe the behavior:

// Before
/**
 * Insert the message content as a formatted prompt directly into the chat
 * input box so the user can review, edit, and send it.
 * For AI messages, wraps with instructions to continue/build on the response.
 * For user messages, inserts the raw content as a reusable prompt.
 */

// After
/**
 * Insert the message content as a formatted prompt directly into the chat
 * input box so the user can review, edit, and send it.
 * The raw message content is inserted unchanged for both user and AI messages.
 */

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