enable persistant undo history

lua/settings.lua

@@ -49,6 +49,10 @@ vim.opt.shiftwidth = 4 -- Indent by 4
 vim.opt.softtabstop = 4 -- Backspace removes 4 spaces
 vim.opt.expandtab = true -- Use spaces by default (overridden per-filetype)
 
+-- Persistent undo
+vim.opt.undofile = true -- Enable persistent undo
+vim.opt.undodir = vim.fn.stdpath("config") .. "/undodir" -- Store undo files in config directory
+
 -- LSP diagnostics configuration
 vim.diagnostic.config({
 	virtual_text = {