fix(subscription): harden quantity updates and proxy trust behavior

Centralize min/max server limits in Stripe quantity updates and wire them into
Livewire subscription actions with price preview/update handling.

Also improve host/proxy middleware behavior by trusting loopback hosts when FQDN
is set and auto-enabling secure session cookies for HTTPS requests behind
proxies when session.secure is unset.

Includes feature tests for loopback trust and secure cookie auto-detection.

app/Http/Middleware/TrustHosts.php

@@ -91,6 +91,13 @@ class TrustHosts extends Middleware
         // Trust all subdomains of APP_URL as fallback
         $trustedHosts[] = $this->allSubdomainsOfApplicationUrl();
 
+        // Always trust loopback addresses so local access works even when FQDN is configured
+        foreach (['localhost', '127.0.0.1', '[::1]'] as $localHost) {
+            if (! in_array($localHost, $trustedHosts, true)) {
+                $trustedHosts[] = $localHost;
+            }
+        }
+
         return array_filter($trustedHosts);
     }
 }

app/Http/Middleware/TrustProxies.php

@@ -25,4 +25,26 @@ class TrustProxies extends Middleware
         Request::HEADER_X_FORWARDED_PORT |
         Request::HEADER_X_FORWARDED_PROTO |
         Request::HEADER_X_FORWARDED_AWS_ELB;
+
+    /**
+     * Handle the request.
+     *
+     * Wraps $next so that after proxy headers are resolved (X-Forwarded-Proto processed),
+     * the Secure cookie flag is auto-enabled when the request is over HTTPS.
+     * This ensures session cookies are correctly marked Secure when behind an HTTPS
+     * reverse proxy (Cloudflare Tunnel, nginx, etc.) even when SESSION_SECURE_COOKIE
+     * is not explicitly set in .env.
+     */
+    public function handle($request, \Closure $next)
+    {
+        return parent::handle($request, function ($request) use ($next) {
+            // At this point proxy headers have been applied to the request,
+            // so $request->secure() correctly reflects the actual protocol.
+            if ($request->secure() && config('session.secure') === null) {
+                config(['session.secure' => true]);
+            }
+
+            return $next($request);
+        });
+    }
 }