fix: remove staticDirs from Storybook config

The public directory was removed during icon system migration but
staticDirs config still referenced it, causing CI build failures.

Removed staticDirs config since we no longer need static files - all
icons are now inline via icon-data.ts.

Author: JakeLin

packages/ui/.storybook/main.ts

@@ -16,7 +16,6 @@ const config: StorybookConfig = {
   docs: {
     autodocs: 'tag',
   },
-  staticDirs: ['../public'],
 };
 
 export default config;