fix: changes for file paths

lua/chatgpt_nvim/handler.lua

@@ -1,7 +1,3 @@
--- lua/chatgpt_nvim/handler.lua
--- No major changes needed, just ensure it can be reused for the new command.
--- Ensuring we have get_clipboard_content and write_file as is.
-
 local M = {}
 
 function M.get_clipboard_content()
@@ -11,7 +7,7 @@ end
 function M.write_file(filepath, content)
   local fd = vim.loop.fs_open(filepath, "w", 438)
   if not fd then
-    vim.api.nvim_err_writeln("Could not open file: " .. filepath)
+    vim.api.nvim_err_writeln("Could not open file for writing: " .. filepath)
     return
   end
   vim.loop.fs_write(fd, content, -1)