Copy Message on Long Press

SlackLite stores chat messages in order. Implement a function that processes a sequence of user actions and returns the copied text after each action while keeping message state consistent.

Each message has a unique integer id and a string text. An action is one of:

• "long_press": if the message exists, copy its text and mark only that message as copied
• "delete": remove the message; if it was the copied message, clear the copied state
• "edit": update the message text; if it is currently copied, the clipboard should immediately reflect the new text

Return a list of clipboard values after every action. Use null when nothing is copied.

Formal Specification

• Input: messages as a list of objects with keys id and text; actions as a list of objects with keys type, id, and optional text
• Output: A list where each element is the current clipboard text after the corresponding action, or null