fix: 筛选标签选中态手机端改为金色

之前手机端选中标签是白色(text-white),仅桌面金色;统一为 text-ark-gold,
与品牌色一致。

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

src/components/messageStream/FilterChips.tsx

@@ -26,7 +26,7 @@ export function FilterChips({ type, onTypeChange }: FilterChipsProps) {
       "relative flex h-[52px] shrink-0 items-center whitespace-nowrap px-3 pb-4 pt-3 text-[15px] leading-6 outline-none transition-colors md:h-auto md:px-1 md:py-3 md:leading-none",
       "border-b-0 md:border-b-2",
       active
-        ? "border-ark-gold font-medium text-white md:text-ark-gold"
+        ? "border-ark-gold font-medium text-ark-gold"
         : "border-transparent text-[#97989A] hover:text-ark-gold/80 md:text-neutral-400",
     ].join(" ");