Improve map bounding#2
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Get rid of geojson with outline, use rendered features at map center to determine whether the center should snap to an area with data. Use all rendered features (or fall back to the initial center) to find a point to move the map center to.
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This PR addresses the map’s behaviour when the center point lies outside the land use data boundary.
Previously, the map enforced strict coordinate-based view constraints, preventing users from centering the view on certain areas—especially at lower zoom levels—leading to a frustrating experience when exploring regions like the southern outskirts of Vienna. Now, after any interaction (zoom, pan, or rotation), the system checks whether land use data exists at the current center. If not, the map automatically repositions to the closest valid point on the boundary of the data layer.
This change would allow to remove rigid positional restrictions. The result would be a more flexible map interface and experience for exploration.