fix(web): explain hosted connection prerequisites - #10129

💭 Looking at the diff, I notice the EmptyDescription now has a custom className with muted foreground styling that seems to override the primitive's base styles, so I want to check that component definition.

1. browse_code — Show the definition of EmptyDescription, EmptyTitle in apps/web/src/components/ui (empty.tsx?) including their default Tailwind classes.

2. browse_code — apps/web/src/routes/_chat.index.tsx

💭 I'm checking whether this new EmptyDescription line just repeats a style override pattern that already existed at another call site, which weakens the case for flagging it as a violation since it's consistent with existing usage rather than introducing something new. Given the redundancy is matching adjacent code and not expanding scope, I'll conclude there's nothing worth flagging here and answer "All clear."