Add opencode notification & mdx support

modules/cli/home.nix

@@ -15,6 +15,7 @@
     settings = {
       small_model = "github-copilot/gpt-5-mini";
       autoupdate = false;
+      plugin = ["@mohak34/opencode-notifier"];
     };
     tui = {
       theme = "catppuccin";
@@ -31,6 +32,12 @@
     };
   };
 
+  xdg.configFile."opencode/opencode-notifier.json".text =
+    builtins.toJSON {
+      sound = false;
+      showSessionTitle = true;
+    };
+
   xdg.configFile."nixpkgs/config.nix".text = ''    {
       allowUnfree = true;
       android_sdk.accept_license = true;