Fix CSS modules build configuration

- Change tsup loader from 'css' to 'local-css' for proper CSS modules support
- CSS classes now properly hashed and mapped (e.g. 'root' -> 'o')
- Fixes broken styling in published package

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

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

Author: naivefun

package.json

@@ -1,6 +1,6 @@
 {
   "name": "handtree",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "A React tree component for hand-crafted hierarchical interfaces",
   "main": "dist/index.js",
   "module": "dist/index.mjs",

tsup.config.ts

@@ -12,7 +12,7 @@ export default defineConfig({
   esbuildOptions(options) {
     options.loader = {
       ...options.loader,
-      '.scss': 'css',
+      '.scss': 'local-css',
     }
   },
 })