chat-ui

052c91bb - fix: add default value for PUBLIC_APP_ASSETS to prevent undefined asset paths

fix: add default value for PUBLIC_APP_ASSETS to prevent undefined asset paths When PUBLIC_APP_ASSETS is not set, asset paths were constructed as `/undefined/manifest.json`, causing 404 errors in production deployments. This fix adds defense in depth: 1. Build-time default in svelte.config.js (PUBLIC_APP_ASSETS defaults to "chatui") 2. Runtime fallback in assetPath getter Fixes #2066 https://claude.ai/code/session_01UHwmz5ocbbRjYZMwgmN6ka