Fix image loading and improve PWA install guidance.

Allow /images/ as public static assets and show install hints on all pages including mobile and HTTP deployments.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/index.js

@@ -104,6 +104,7 @@ const PUBLIC_PATHS = new Set([
 function isPublicPath(reqPath) {
   if (PUBLIC_PATHS.has(reqPath)) return true
   if (reqPath.startsWith('/assets/')) return true
+  if (reqPath.startsWith('/images/')) return true
   if (reqPath === '/sw.js' || reqPath.endsWith('.webmanifest')) return true
   if (/^\/workbox-[\w-]+\.js$/.test(reqPath)) return true
   return false