feat(qf): add key mappings for quickfix navigation

- Users can now navigate to the next quickfix item with Ctrl+j.
- Users can navigate to the previous quickfix item with Ctrl+k.
- Pressing Enter on a quickfix item opens it and closes the quickfix window.

Author: ruicsh

after/ftplugin/qf.lua

@@ -1,3 +1,14 @@
 vim.opt_local.relativenumber = false
 vim.opt_local.statusline = "%!v:lua._G.status_line_qf()"
 vim.opt_local.cursorline = true
+
+vim.keymap.set("n", "<c-j>", "j", { desc = "Next quickfix item", buffer = true })
+vim.keymap.set("n", "<c-k>", "k", { desc = "Previous quickfix item", buffer = true })
+
+vim.keymap.set("n", "<cr>", function()
+	local item = vim.fn.getqflist()[vim.fn.line(".")]
+	if item and item.valid == 1 then
+		vim.cmd("cc " .. vim.fn.line("."))
+		vim.cmd("cclose")
+	end
+end, { buffer = true, desc = "Open item and close quickfix" })