Update gems and fix lint to clear CI failures

Bumps dependencies (jwt 3.2.0, puma 8.0.2, net-imap 0.6.4.1 and others
via bundle update) to resolve bundler-audit advisories, and applies
standardrb autofixes so the lint job passes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/controllers/api/forward_auth_controller.rb

@@ -156,7 +156,7 @@ module Api
     end
 
     def render_bearer_error(message)
-      render json: { error: message }, status: :unauthorized
+      render json: {error: message}, status: :unauthorized
     end
 
     def check_forward_auth_token
@@ -207,7 +207,7 @@ module Api
 
       session[:return_to_after_authenticating] = original_url
 
-      login_params = { rd: original_url, rm: request.method }
+      login_params = {rd: original_url, rm: request.method}
       login_url = "#{base_url}/signin?#{login_params.to_query}"
 
       redirect_to login_url, allow_other_host: true, status: :found

app/controllers/concerns/authentication.rb

@@ -191,7 +191,7 @@ module Authentication
     token = SecureRandom.urlsafe_base64(32)
     Rails.cache.write(
       "forward_auth_token:#{token}",
-      { session_id: session_obj.id, host: bound_host },
+      {session_id: session_obj.id, host: bound_host},
       expires_in: 60.seconds
     )