fix(clipboard): load clipboard on usage

Closes #8827

lib/clipboard.zsh

@@ -100,8 +100,8 @@ function detect-clipboard() {
   fi
 }
 
-# Detect at startup. A non-zero exit here indicates that the dummy clipboards were set,
-# which is not really an error. If the user calls them, they will attempt to redetect
-# (for example, perhaps the user has now installed xclip) and then either print an error
-# or proceed successfully.
-detect-clipboard || true
+function clipcopy clippaste {
+  unfunction clipcopy clippaste
+  detect-clipboard || true # let one retry
+  "$0" "$@"
+}