Build an inbox split view with Tailwind CSS: a left list of conversations (sender, subject, snippet, unread dot, timestamp) and a right reading pane showing the selected message with its thread, reply box and actions. Mark the selected row, support keyboard up/down navigation through the list, and on mobile show the list first and the pane as a full-screen overlay when a row is tapped.
提示词保持英文原文——直接粘贴进 Claude、Cursor、v0 或任何 AI 编程工具即可使用。