I got the code, made it run in JS (still uses OpenRouter but I am working on including JS LLM) and you can even download the html and have a go at it.
OpenSource as always.
"New Conversation" button does not work on Mac.
I tried both Chrome and Safari
(index):69 Uncaught TypeError: crypto.randomUUID is not a function
at Object.createConversation ((index):69:3818)
at $ ((index):127:1402)
at onNewConversation ((index):127:3099)
at yd ((index):16:127583)
at (index):16:132709
at Es ((index):16:15118)
at Zc ((index):16:128817)
at uo ((index):17:28666)
at qy ((index):17:28488)