fix: address CI fmt and lint check failures

Fix prettier formatting for render-test.html and correct import order
in render-test.ts to satisfy biome lint rules.

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

Author: slang25

demo/bin/render-test.ts

@@ -10,7 +10,7 @@
  */
 
 import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'fs';
-import { join, dirname } from 'path';
+import { dirname, join } from 'path';
 import { fileURLToPath } from 'url';
 
 // Get script directory