feat(copilot-chat): ctrl-s now works in both normal and insert mode

lua/lazyvim/plugins/extras/coding/copilot-chat.lua

@@ -38,6 +38,7 @@ return {
       }
     end,
     keys = {
+      { "<c-s>", "<CR>", ft = "copilot-chat", desc = "Submit Prompt", remap = true },
       { "<leader>a", "", desc = "+ai", mode = { "n", "v" } },
       {
         "<leader>aa",