[openstreetmap/openstreetmap-website] Add user profile heatmap visualization for contributions (PR #5402)

[Emin Kocan]

I've updated the code to account for the "Preferred Website Color Scheme." Theme settings should now be working correctly.

**UX Thoughts:**  
- **Disabling Feature in Profile:** Data is already public and open, so I believe all mappers should have a contribution graph. This feature provides valuable insights for more experienced mappers as a reference point to understand others' activity.  
- **"Never Contributed" Case:** Showing an empty heatmap with a fallback message seems like a good approach. From a UX perspective, maintaining a consistent layout across profiles would be more intuitive and visually cohesive.

**Code Comments:**  
- **Localizing Starting Week:** I attempted to localize the starting week as suggested but couldn't find a clean solution due to limitations with the `ghDays` subdomain. If anyone has suggestions, I'm open to exploring further.  
- **Separate JS Files:** There's already a `heatmap.js` file containing heatmap-related functionality, included in `application.js` for precompilation. I'm hesitant to introduce additional files unless there's a clear benefit. Consolidating heatmap logic here seems to make sense for now.  
- **Updating `package.json`:** I’ll update the `package.json` as part of the changes, but I’m unsure if additional configuration is needed. Please let me know if there are any dependencies or settings to consider. @gravitystorm 

Let me know if further adjustments or discussions are needed!


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