fix(eat): make Escape the unified copy-mode exit

EAT's semi-char mode left the bare escape key unbound and treated ESC only as the Meta prefix, so a lone Escape never reached the pty. That is why C-<up>'s tmux copy-mode could not be exited with Escape: tmux's own Escape=cancel binding never saw the key. Bind <escape> to forward ESC to the terminal, so it cancels tmux copy-mode and still works in TUIs like vim. Also bind <escape> in eat-mode-map to return to semi-char, so the same key exits EAT's own emacs and char modes. One exit key for both copy views; q is no longer required.

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