feat: Implement complete event ticketing system with Stripe integration and email confirmations

- Enhanced events index page with improved visual design and better information display
- Completely redesigned event show page with modern layout, ticket selection, and checkout functionality
- Implemented Stripe payment processing for ticket purchases
- Created ticket generation system with PDF tickets and QR codes
- Added email confirmation system with ticket attachments
- Updated database configuration to use SQLite for easier development setup
- Fixed gem dependencies and resolved conflicts
- Improved error handling throughout the checkout process
- Enhanced Stimulus controller for ticket cart management
- Added proper redirect handling for successful and cancelled payments

config/initializers/stripe.rb

@@ -0,0 +1,27 @@
+Rails.application.configure do
+  # Try to get Stripe keys from environment variables first, then from credentials
+  stripe_publishable_key = ENV["STRIPE_PUBLISHABLE_KEY"]
+  stripe_secret_key = ENV["STRIPE_SECRET_KEY"]
+  stripe_webhook_secret = ENV["STRIPE_WEBHOOK_SECRET"]
+
+  # If not in environment variables, try to get from credentials
+  if Rails.application.respond_to?(:credentials) && Rails.application.credentials.respond_to?(:stripe)
+    stripe_credentials = Rails.application.credentials.stripe
+    if stripe_credentials
+      stripe_publishable_key ||= stripe_credentials[:publishable_key] if stripe_credentials.key?(:publishable_key)
+      stripe_secret_key ||= stripe_credentials[:secret_key] if stripe_credentials.key?(:secret_key)
+      stripe_webhook_secret ||= stripe_credentials[:webhook_secret] if stripe_credentials.key?(:webhook_secret)
+    end
+  end
+
+  config.stripe = {
+    publishable_key: stripe_publishable_key,
+    secret_key: stripe_secret_key,
+    signing_secret: stripe_webhook_secret
+  }
+end
+
+# Only set the API key if it exists
+if Rails.application.config.stripe[:secret_key].present?
+  Stripe.api_key = Rails.application.config.stripe[:secret_key]
+end