feat: consolidate Kanagawa theme and refine Walker and Limine styling

modules/capabilities/noctalia.nix

@@ -9,7 +9,6 @@
     }:
     let
       homeDir = config.home.homeDirectory;
-      wallpaper = "${homeDir}/media/images/wallpapers/green-leaves.png";
     in
     {
       desktop.autostart = [ [ (lib.getExe config.programs.noctalia.package) ] ];
@@ -85,7 +84,6 @@
           };
 
           shell = {
-            font_family = "Lexend";
             polkit_agent = true;
             # Handy provides recording feedback; omit microphone activity popups/indicators.
             privacy.mic_filter_regex = ".*";
@@ -99,9 +97,6 @@
           };
 
           theme = {
-            builtin = "Kanagawa";
-            community_palette = "Kanagawa Paper";
-            wallpaper_scheme = "m3-content";
             templates = {
               enable_builtin_templates = false;
               enable_community_templates = false;
@@ -110,8 +105,6 @@
 
           wallpaper = {
             directory = "${homeDir}/media/images/wallpapers";
-            default.path = wallpaper;
-            last.path = wallpaper;
           };
 
           weather.refresh_minutes = 15;