fix: make native boot background black and bust stale boot guard cache

index.html

@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="en">
+<html lang="en" style="background:#050505">
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover" />
@@ -80,14 +80,14 @@
     <link rel="preconnect" href="https://relay.skate-spots.org" crossorigin>
     <link rel="preconnect" href="https://blossom.skate-spots.org" crossorigin>
   </head>
-  <body>
+  <body style="background:#050505">
     <div id="root"></div>
 
     <!--
       BOOT CRASH GUARD (native-safe) — external so the web build can ship a
       strict CSP (script-src 'self') with no 'unsafe-inline'. See boot-guard.js.
     -->
-    <script src="/boot-guard.js"></script>
+    <script src="/boot-guard.js?v=20261030"></script>
 
     <script type="module" src="/src/main.tsx"></script>
   </body>