chores: use stopinsert (#1745)

lua/avante/llm_tools/str_replace.lua

@@ -136,8 +136,8 @@ function M.func(opts, on_log, on_complete)
   local confirm = Helpers.confirm("Are you sure you want to apply this modification?", function(ok)
     pcall(vim.api.nvim_del_augroup_by_id, augroup)
     vim.api.nvim_set_current_win(sidebar.code.winid)
-    vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<Esc>", true, false, true), "n", true)
-    vim.cmd("undo")
+    vim.cmd("noautocmd stopinsert")
+    vim.cmd("noautocmd undo")
     if not ok then
       vim.api.nvim_set_current_win(current_winid)
       on_complete(false, "User canceled")