feat(plugin): Add ghostty-copypaste plugin

plugins/ghostty-copypaste/README.md

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+# zsh-ghostty-copypaste
+
+[ghostty](https://ghostty.org/) users, this `zsh` plugin allows you to copy / paste a text selected with the keyboard with `ctrl+shift+c` / `ctrl+shift+v`.
+
+To use it, add `ghostty-copypaste` to the plugins array of your `.zshrc` file:
+
+```
+plugins=(... ghostty-copypaste)
+```
+
+## Principle
+
+- `ghossty` allows to copy / paste a text selected with the mouse, but not with the keyboard, because this is an action devoted to a terminal (`zsh`) and not to a terminal emulator (`ghostty`).
+- When no mouse selection is started, `ghostty` passes a Control Sequence Introducer `^[[99;6u` / `^[[118;6u` to `zsh`. The plugin binds these CSI to the correct copy / paste functions for X11 or Wayland.
+- Be careful, `ghostty` can lose focus when copying and pasting because of `xclip` or `wl-copy`/`wl-paste` in the plugin. If you use it as a context terminal ("quake"), it is best not to close it when it loses focus.

plugins/ghostty-copypaste/ghostty-copypaste.plugin.zsh

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+function zle-copy-to-clipboard {
+    local selected_text start_pos end_pos
+
+    (( $MARK < $CURSOR ))
+        && { start_pos=$MARK; end_pos=$CURSOR; }
+        || { start_pos=$CURSOR; end_pos=$MARK; }
+
+    (( start_pos < 0 || end_pos < 0 ))
+        && zle -R && return
+
+    selected_text="${BUFFER[$start_pos+1, $end_pos]}"
+
+    command -v xclip &> /dev/null
+        && ( echo -n "$selected_text" | xclip -selection clipboard )
+        && zle -R && return
+
+    command -v wl-copy &> /dev/null
+        && ( echo -n "$selected_text" | wl-copy )
+        && zle -R && return
+
+    zle -R
+}
+
+function zle-paste-from-clipboard {
+    local clipboard_content
+
+    command -v xclip &> /dev/null
+        && clipboard_content=$(xclip -selection clipboard -o 2>/dev/null)
+    command -v wl-paste &> /dev/null
+        && clipboard_content=$(wl-paste --no-newline 2>/dev/null)
+
+    [[ -z "$clipboard_content" ]] && return
+
+    LBUFFER+="$clipboard_content"
+    zle -R
+}
+
+zle -N zle-copy-to-clipboard
+zle -N zle-paste-from-clipboard
+
+# these 2 CSI from ghostty are sent for Ctrl+Shift+C and Ctrl+Shift+V
+bindkey '^[[99;6u' zle-copy-to-clipboard
+bindkey '^[[118;6u' zle-paste-from-clipboard