fix improve custom nginx error pages

deploy/nginx.conf

@@ -12,6 +12,10 @@ server {
   root /usr/share/nginx/html;
   index index.html;
 
+  # Custom error pages
+  error_page 404 /404.html;
+  error_page 500 502 503 504 /500.html;
+
   add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' https://www.instagram.com https://*.instagram.com https://cloud.umami.is https://*.umami.is https://wa.santhoshj.com; style-src 'self' 'unsafe-inline'; font-src 'self' data:; img-src 'self' https: data: blob:; media-src 'self' https://anchor.fm https://*.anchor.fm https://d3ctxlq1ktw2nl.cloudfront.net; connect-src 'self' https://cloud.umami.is https://*.umami.is https://wa.santhoshj.com; frame-src https://www.youtube.com https://open.spotify.com https://www.instagram.com https://*.instagram.com; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests" always;
   add_header X-Content-Type-Options "nosniff" always;
   add_header X-Frame-Options "DENY" always;
@@ -24,15 +28,22 @@ server {
     try_files $uri =404;
   }
 
-  location ~* \.(?:avif|bmp|gif|ico|jpe?g|png|svg|webp)$ {
+  location ~* \.(?:avif|bmp|gif|ico|jpe?g|png|svg|webp|)$ {
     expires 180d;
     add_header Cache-Control "public, max-age=15552000" always;
     try_files $uri =404;
   }
 
+  # Ensure error pages are served without redirect
+  location = /404.html {
+    internal;
+  }
+
+  location = /500.html {
+    internal;
+  }
+
   location / {
-    # Serve directory index pages without requiring a trailing slash.
-    # This fixes /videos (and similar) resolving to /videos/index.html.
     try_files $uri $uri/index.html $uri/ =404;
   }
-}
+}