feat(build): disable commitlint subject-case rule and add clean-dist script

- Disable subject-case rule in commitlint to allow capital letters in commit subjects
- Add clean-dist.js script to preserve UI bundle during TypeScript builds
- Update package.json prebuild script to use new clean-dist.js

commitlint.config.cjs

@@ -17,8 +17,8 @@ module.exports = {
       'build',    // Build system → no release
       'revert'    // Revert commit → PATCH
     ]],
-    // Subject must be lowercase
-    'subject-case': [2, 'always', 'lower-case'],
+    // Subject case - disabled to allow capital letters
+    'subject-case': [0],
     // Max header length (type + scope + subject)
     'header-max-length': [2, 'always', 100]
   }