首页容器:去手机外壳+总宽锁540居中+窄屏100%

- app-shell: 去掉 web-phone-preview 手机外框(useWebPhonePreview=false)
- index.css device-stage: width min(100vw,540px)+margin-inline auto+100dvh(居中,窄屏100%)
- 删除 @media768 的 9:16 框,改为始终 540

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

vtubermini/src/components/app-shell.tsx

@@ -1,5 +1,4 @@
 import type { ReactNode } from 'react'
-import { shouldUseWebPhonePreview } from '../lib/platform'
 import type { AppRoute } from '../lib/types'
 
 interface AppShellProps {
@@ -8,7 +7,7 @@ interface AppShellProps {
 }
 
 export function AppShell({ activeRoute, children }: AppShellProps) {
-  const useWebPhonePreview = shouldUseWebPhonePreview()
+  const useWebPhonePreview = false
   const isImmersive =
     activeRoute === 'home' ||
     activeRoute === 'anniversary' ||

vtubermini/src/index.css

@@ -71,12 +71,11 @@ select {
 }
 
 .device-stage {
-  width: 100vw;
-  width: 100dvw;
-  max-width: 100%;
+  width: min(100vw, 540px);
+  width: min(100dvw, 540px);
   height: 100svh;
   height: 100dvh;
-  max-height: 100%;
+  margin-inline: auto;
   overflow: hidden;
   border-radius: 0;
 }
@@ -127,14 +126,6 @@ select {
   display: none;
 }
 
-@media (min-width: 768px) {
-  .device-stage {
-    width: min(calc(100vw - 24px), calc((100svh - 32px) * 9 / 16), 430px);
-    height: min(calc(100svh - 32px), calc((100vw - 24px) * 16 / 9), 764px);
-    border-radius: 28px;
-  }
-}
-
 .web-phone-preview-root {
   display: grid;
   place-items: center;