config: Add the option toast_on_clipboard_copy

Add a config option to enable/disable the toast shown on clipboard copy

src/apprt/gtk/Window.zig

@@ -894,8 +894,10 @@ fn gtkActionCopy(
         return;
     };
 
+    if (self.app.config.@"toast-on-clipboard-copy") {
         self.sendToast("Copied to clipboard");
     }
+}
 
 fn gtkActionPaste(
     _: *c.GSimpleAction,

src/config/Config.zig

@@ -1276,6 +1276,9 @@ keybind: Keybinds = .{},
 @"clipboard-read": ClipboardAccess = .ask,
 @"clipboard-write": ClipboardAccess = .allow,
 
+/// Enables or disables the toast message on a clipboard copy action.
+@"toast-on-clipboard-copy": bool = true,
+
 /// Trims trailing whitespace on data that is copied to the clipboard. This does
 /// not affect data sent to the clipboard via `clipboard-write`.
 @"clipboard-trim-trailing-spaces": bool = true,