feat(copy): improve message when copying to system clipboard (#1321)

This is to avoid confusion: New users coming from tmux might expect
internal copy/paste buffers in zellij which are separate from the system
clipboard.
It may therefore be surprising where the copied text ends up and that
zellij has no dedicated "paste" functionality.

Related issues: #1288 #1018

default-plugins/status-bar/src/second_line.rs

@@ -318,10 +318,10 @@ pub fn text_copied_hint(palette: &Palette, copy_destination: CopyDestination) ->
     let hint = match copy_destination {
         CopyDestination::Command => "Text piped to external command",
         #[cfg(not(target_os = "macos"))]
-        CopyDestination::Primary => "Text copied to primary selection",
+        CopyDestination::Primary => "Text copied to system primary selection",
         #[cfg(target_os = "macos")] // primary selection does not exist on macos
-        CopyDestination::Primary => "Text copied to clipboard",
-        CopyDestination::System => "Text copied to clipboard",
+        CopyDestination::Primary => "Text copied to system clipboard",
+        CopyDestination::System => "Text copied to system clipboard",
     };
     LinePart {
         part: Style::new().fg(green_color).bold().paint(hint).to_string(),