refactor(ui): delete legacy static website and refresh documentation

docs/client/design.md

@@ -1,8 +1,8 @@
 # Design language
 
 This guide describes the current browser UI. Use
-[style.css](../../s2s-client/style.css) as the token/selector reference and
-[index.html](../../s2s-client/index.html) for the theme-specific structure.
+[legacy-theme.css](../../s2s-frontend/src/styles/legacy-theme.css) as the token/selector
+reference and [App.tsx](../../s2s-frontend/src/App.tsx) for the theme-specific structure.
 Earlier documentation described a monochrome-only dark UI; the current design
 also uses aurora gradients, glass surfaces, and a separate light theme.
 
@@ -36,7 +36,7 @@ selector overrides rather than a second stylesheet.
 | Listening/user speaking | Cyan (`--listening`) |
 | Assistant speaking | Violet (`--speaking`) |
 | Processing | Amber (`--processing`) |
-| Ready/authenticated | Green (`--success`) |
+| Ready/success | Green (`--success`) |
 | Error | Red (`--error`) |
 
 `--voice-user`, `--voice-assistant` and `--voice-tool` connect transcript roles