Analytics: Webhook Events and Product Mapping as dedicated pages

The Analytics section is restructured. Webhook Events and Product Mapping are now separate pages accessible from an expandable sidebar section, making it easier to monitor activity and review your configuration at a glance.

• Webhook Events: inbound delivery log with status filter, error details, and replay for failed events
• Product Mapping: read-only table showing all active mappings with their trigger, newsletter, and email settings
• Mobile navigation: icons added to section headers for faster orientation