[Neovim] Fix snacks opts silently discarding merged config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

home-manager/features/neovim/config/lua/plugins/snacks.lua

@@ -1,7 +1,7 @@
 return {
   "folke/snacks.nvim",
   opts = function(_, opts)
-    vim.tbl_deep_extend("force", opts, {
+    opts = vim.tbl_deep_extend("force", opts, {
       styles = {
         notification = {
           wo = { wrap = true }, -- wrap notifications
@@ -57,6 +57,7 @@ return {
         end
       end,
     }):map("<leader>ut", { desc = "Toggle Color Column" })
+    return opts
   end,
   keys = {
     {