feat(common): add Symbola font

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

Author: eapolinario

nixos/modules/common/default.nix

@@ -35,6 +35,7 @@
     enableDefaultPackages = true;
     packages = with pkgs; [
       nerd-fonts.fira-code
+      symbola
     ];
     fontconfig.defaultFonts.monospace = [ "FiraCode Nerd Font Mono" ];
   };