fix: handle symlinks in chat checks (issue: #104)

Author: Robitx

lua/gp/init.lua

@@ -1376,8 +1376,10 @@ end
 ---@param file_name string # file name
 ---@return string | nil # reason for not being a chat or nil if it is a chat
 M.not_chat = function(buf, file_name)
-	if not _H.starts_with(file_name, M.config.chat_dir) then
-		return "not in chat directory (" .. M.config.chat_dir .. ")"
+	file_name = vim.fn.resolve(file_name)
+	local chat_dir = vim.fn.resolve(M.config.chat_dir)
+	if not _H.starts_with(file_name, chat_dir) then
+		return "resolved file (" .. file_name .. ") not in chat dir (" .. chat_dir .. ")"
 	end
 
 	local lines = vim.api.nvim_buf_get_lines(buf, 0, -1, false)