Initial release: Piwik Pro on-page statistics module
Features:
- Display analytics stats (visitors, unique visitors, page views, bounce rate) in modal
- Interactive Chart.js graphs (pageviews, visits, browsers, countries, OS, resolutions)
- Configurable display settings and modal dimensions
- Integration with piwik_pro and piwik_pro_dashboard modules
- Caching of API responses (5 min TTL)
- Timezone-aware date calculations
