feat(web): simplify subscription and manual download flows and sync UHD styles

apps/web/app/components/liquid-surface.tsx

@@ -65,6 +65,7 @@ export function LiquidSurface({
   const t = TIERS[tier];
   return (
     <LiquidGlass
+      reveal="immediate"
       mode="custom"
       refraction="lens"
       lensProfile="material"
@@ -94,6 +95,8 @@ export function LiquidSurface({
           : blurOnly
             ? { backgroundColor: dark ? t.fill.dark : t.fill.light }
             : null),
+        // 初始化时使用本档底色;磨砂外层已经铺底,内层保持透明,避免叠底
+        ["--glass-pending-fill" as string]: blurOnly ? "transparent" : dark ? t.fill.dark : t.fill.light,
         // 1px 暗边线在亮棱外侧,投影只留贴边一层
         boxShadow: dark
           ? "0 0 0 1px rgba(0,0,0,0.28), 0 8px 24px -14px rgba(0,0,0,0.5)"