use yazi outside of helix and chawan as manpager

platforms/home-manager/modules/nmasur/presets/programs/chawan.nix

@@ -0,0 +1,25 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.nmasur.presets.programs.chawan;
+in
+
+{
+
+  options.nmasur.presets.programs.chawan.enable = lib.mkEnableOption "chawan TUI web browser";
+
+  config = lib.mkIf cfg.enable {
+
+    # Set Chawan as the default app for manual pages
+    home.sessionVariables = {
+      MANPAGER = "${lib.getExe pkgs.chawan} -T text/x-ansi";
+    };
+
+  };
+
+}