Add Radius Drawing Tool

Is your feature request related to a problem? Please describe.

Currently, Nextcloud Maps does not offer a way to draw a radius around a specific point. This makes it difficult for users to visually analyze distances from a given location, such as:

• Planning service coverage areas
• Measuring travel distances
• Assessing proximity to key points of interest

Most mapping tools, including Google My Maps, do not provide an easy way to draw a radius, despite its usefulness in professional settings like logistics, real estate, and business planning. Users often have to rely on third-party tools that are not well-integrated into their workflows.

Describe the solution you'd like

I would like to see a radius drawing tool added to Nextcloud Maps, allowing users to:

✅ Select a point on the map and specify a radius (e.g., 5 km, 10 miles)
✅ Customize the circle’s color, opacity, and size
✅ Overlay multiple radius circles for comparison

Describe alternatives you've considered

• Using external tools like Scribble Maps, CalcMaps, or Google My Maps, but these require leaving the Nextcloud environment and do not integrate with existing Nextcloud data.
• Manually estimating distances using the built-in measuring tool, but this is less accurate and lacks visualization.

Additional context

This feature would be highly beneficial for professionals who rely on accurate distance visualization, including:

🚛 Logistics & Delivery Services – Defining service coverage areas
🏢 Business Expansion Planning – Assessing potential locations
📍 Event Organization – Planning travel distance for attendees

Since very few mapping tools offer this functionality, implementing it in Nextcloud Maps would set it apart and make it a go-to solution for users needing precise geographic analysis while keeping some privacy.

Would love to hear your thoughts on this one 🚀

Thank you for the amazing work already done.

The issue names no files or tests; start by reviewing the existing map interaction and built-in measuring tool. Clarify the radius input, supported units, circle styling, and handling of multiple circles before defining what completion requires.