feat: configure gh-dash layout

git/default.nix

@@ -4,6 +4,10 @@
   programs = {
     less.enable = true;
     git-credential-oauth.enable = true;
+    git-worktree-switcher = {
+      enable = true;
+      enableZshIntegration = true;
+    };
 
     git = {
       enable = true;

horsch/github.nix

@@ -23,6 +23,12 @@
       enable = true;
 
       settings = {
+        defaults = {
+          preview = {
+            open = true;
+            width = 64;
+          };
+        };
       };
     };
   };