fix: peak popup backdrop was static — !important on background-position blocked the drift animation

Author: Dmenec

static/map.html

@@ -356,7 +356,7 @@
       url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%221200%22%20height%3D%22240%22%20viewBox%3D%220%200%201200%20240%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22rgba(126%2C200%2C126%2C0.075)%22%20d%3D%22M0%2C150%20C100%2C120%20200%2C120%20300%2C150%20C400%2C180%20500%2C180%20600%2C150%20C700%2C120%20800%2C120%20900%2C150%20C1000%2C180%201100%2C180%201200%2C150%20L1200%2C240%20L0%2C240%20Z%22%2F%3E%3C%2Fsvg%3E"),
       url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%221200%22%20height%3D%22240%22%20viewBox%3D%220%200%201200%20240%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22rgba(126%2C200%2C126%2C0.11)%22%20d%3D%22M0%2C178%20C100%2C222%20200%2C222%20300%2C178%20C400%2C134%20500%2C134%20600%2C178%20C700%2C222%20800%2C222%20900%2C178%20C1000%2C134%201100%2C134%201200%2C178%20L1200%2C240%20L0%2C240%20Z%22%2F%3E%3C%2Fsvg%3E") !important;
     background-repeat: repeat-x, repeat-x !important;
-    background-position: 0 100%, 0 100% !important;
+    background-position: 0 100%, 0 100%;  /* not !important — animation must be able to move it */
     background-size: 1200px 150px, 1200px 190px !important;
     border: 1px solid #4a7a4a !important;
     border-radius: 10px !important;

static/sw.js

@@ -1,4 +1,4 @@
-const CACHE = 'pt-v30';
+const CACHE = 'pt-v31';
 const STATIC = [
   '/', '/map.html', '/challenge.html', '/calendar/', '/login.html',
   '/i18n.js', '/manifest.json', '/icon-192.png', '/icon-512.png',