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/mailers/totp_mailer.rb

@@ -2,6 +2,6 @@ class TotpMailer < ApplicationMailer
   def enabled(user)
     @user = user
     mail subject: "Two-factor authentication enabled on your account",
-         to: user.email_address
+      to: user.email_address
   end
 end