[openstreetmap/openstreetmap-website] Calendar heatmap of user contributions on user profile (Issue #5373)

[Emin Kocan]

### Problem

The current user profile page provides a detailed summary of contributions but lacks a visual representation of activity trends. A calendar heatmap, similar to GitHub's user contribution calendar, would make it easier to understand user engagement over time at a glance.

### Description

I have implemented a working calendar heatmap locally for changesets using the [cal-heatmap-rails library](https://rubygems.org/gems/cal-heatmap-rails/versions/3.6.2?locale=en) for display, querying changesets directly from the database. The heatmap visually displays daily contributions, with color intensity representing the number of changes for the changset on the given date.

**Additional Ideas:**
- Not sure if we should count changsets only in initial version or add diary entries and note creations/comments as well.

- Since we have dark mode on OSM plan is for that to be reflected on the heatmap as well.

**Next Steps:**  
I’ll open a PR after refining the implementation. In the meantime, I’d love to hear your thoughts and suggestions on this feature and the proposed contribution types.


### Screenshots

<img width="631" alt="Screenshot 2024-12-03 at 11 55 46" src="https://github.com/user-attachments/assets/dcb68c4f-f82f-4faa-b87b-d42ee29e3389">


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