pkg(nixvim): Refactor ui module for nixvim

pkgs/nixvim/ui/lualine.nix

@@ -0,0 +1,21 @@
+{...}: {
+  youthlic.plugins.lualine = {
+    enable = true;
+    luaConfig.pre =
+      #lua
+      ''
+        do
+          vim.g.lualine_laststatus = vim.o.laststatus
+          if vim.fn.argc(-1) > 0 then
+            vim.o.statusline = " "
+          else
+            vim.o.laststatus = 0
+          end
+        end
+        do
+          vim.o.laststatus = vim.g.lualine_laststatus
+        end
+      '';
+    settings = {};
+  };
+}