Fix bin/publish: copy docs.dist from project root

Fix bin/publish: use correct .env path for rspade_system
Fix bin/publish script: prevent grep exit code 1 from terminating script

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

node_modules/postcss-merge-longhand/src/lib/getLastNode.js

@@ -0,0 +1,7 @@
+'use strict';
+/** @type {(rule: import('postcss').AnyNode[], prop: string) => import('postcss').Declaration} */
+module.exports = (rule, prop) => {
+  return /** @type {import('postcss').Declaration} */ (
+    rule.filter((n) => n.type === 'decl' && n.prop.toLowerCase() === prop).pop()
+  );
+};