[openstreetmap/openstreetmap-website] Parse URL zoom level with decimals? (Issue #6763)

[Nils]

nilsnolde created an issue (openstreetmap/openstreetmap-website#6763)

### Problem

In our [Valhalla web app](https://valhalla.openstreetmap.de/directions?profile=bicycle&style=carto), we have a button in the lower-right to jump to osm.org which is supposed to open at the same/similar extent & zoom. Very convenient for app users and also for us when debugging. 

Currently osm.org would open at smaller/larger extent than our view bcs of rounding

### Description

Would you accept a change that would parse the zoom level as decimal? The browser URL could stay as it is (i.e. truncate/round to integer), just using it for zooming/extent.

### Screenshots

This is what it looks like currently. We also simply floor the float zoom currently, but that's a separate bug.

<img width="2256" height="1448" alt="Image" src="https://github.com/user-attachments/assets/d010d716-45ed-48d3-9f58-c7070e93a0bf" />  <img width="2256" height="1448" alt="Image" src="https://github.com/user-attachments/assets/0a30dab2-ff76-4602-adb9-4461501c5620" />

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