feat: vim copy/paste shortcuts

`CTRL+I` or any keybind, should show a prompt saying: vim mode active press yy to yank or copy the last command from the session file or buffer to clipboard. Similarly use p to paste from clipboard into the buffer.

The issue names no files or tests. Start by locating the shell's keyboard input, command buffer, and session-file handling, then determine how clipboard access is implemented. Done means a keybinding shows the vim-mode prompt, yy copies the last command, and p pastes clipboard content into the buffer.

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