## Summary
Adds route analytics heatmaps, stacked on top of
`codex/analytics-overview-filters` (#1496).
- Heatmap API routes (`/analytics/heatmap`, internal heatmap +
heatmap-token endpoints)
- Signed heatmap token signing/verification lib + tests
- Dashboard heatmaps page (client + route)
- Dev-tool + event-tracker support for heatmap capture
- ClickHouse migration support
## Demo
https://app.devin.ai/attachments/49cd6a96-8962-46d9-b8fb-145746cc6dee/rec-c80ec66f-21a3-49fb-bfae-19195ce7b930-edited.mp4
## Notes
Base branch is `codex/analytics-overview-filters` so the diff shows only
the heatmap changes. Will retarget to `dev` once the base PR lands.
Link to Devin session:
https://app.devin.ai/sessions/16f8adac29b948b38280c85418617fea
Requested by: @mantrakp04
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
* **New Features**
* Added clickmap overlay to analytics dashboard, enabling visual click
heatmap analysis on live websites.
* Enhanced analytics metrics with hourly breakdowns, bounce rates, and
top regions/browsers/devices filtering.
* **Bug Fixes**
* Improved click event tracking accuracy and dead-click detection.
* Fixed overlay z-index stacking for better visibility.
* **Style**
* Updated dashboard card padding and navigation button styling for
consistency.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: mantra <mantra@stack-auth.com>
Co-authored-by: Cursor <cursoragent@cursor.com>
