fix: 移动端播放按钮点按后粘连放大的问题

.btn-play:hover 的 scale(1.05) 在触屏上点按后 :hover 粘住不解除，
改为仅 (hover: hover) and (pointer: fine) 设备生效。

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

sw.js

@@ -4,7 +4,7 @@
  * - /api/tts 不拦截，直接透传网络
  */
 const CACHE = "fj-shell-v1";
-const SHELL = ["/", "/index.html", "/style.css?v=17", "/app.js?v=15", "/icon.svg", "/icon-180.png", "/icon-192.png", "/icon-512.png", "/manifest.json"];
+const SHELL = ["/", "/index.html", "/style.css?v=18", "/app.js?v=15", "/icon.svg", "/icon-180.png", "/icon-192.png", "/icon-512.png", "/manifest.json"];
 
 self.addEventListener("install", (e) => {
   e.waitUntil(caches.open(CACHE).then((c) => c.addAll(SHELL)).then(() => self.skipWaiting()));