feat(zed): add Nord theme and project settings

Theme file lives in .zed/nord.json; arty zed:theme:install copies it
to the Windows Zed themes directory via wslpath.

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

.gitignore

@@ -40,5 +40,8 @@
 !.config/glow/
 !.config/glow/glow.yml
 !.config/glow/nord.json
+!.zed/
+!.zed/settings.json
+!.zed/nord.json
 !LICENSE
 !README.md