feat: consolidate Kanagawa theme and refine Walker and Limine styling

modules/capabilities/walker.nix

@@ -129,6 +129,34 @@
         enable = true;
         runAsService = true;
 
+        config.theme = "constellation";
+        themes.constellation = {
+          layouts.layout =
+            lib.replaceStrings
+              [ ''<property name="height-request">570</property>'' ]
+              [ ''<property name="height-request">460</property>'' ]
+              (builtins.readFile "${inputs.walker}/resources/themes/default/layout.xml");
+          style = lib.mkBefore (
+            builtins.readFile "${inputs.walker}/resources/themes/default/style.css"
+            + ''
+              .box-wrapper {
+                padding: 10px;
+                border-radius: 10px;
+                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
+              }
+              .search-container, .item-box, .preview { border-radius: 6px; }
+              .input { padding: 8px 10px; }
+              .item-box { padding: 5px 8px; }
+              .large-icons { -gtk-icon-size: 24px; }
+              .item-image-text { font-size: 24px; }
+              .item-subtext { opacity: 0.75; }
+              .item-quick-activation { padding: 3px 5px; }
+              .keybinds { padding-top: 6px; }
+              .keybind-bind { opacity: 0.65; }
+            ''
+          );
+        };
+
         config.providers = {
           default = walkerDefaults.providers.default ++ [ "menus:projects" ];
           prefixes = walkerDefaults.providers.prefixes ++ [