Integrate output with spatialdata workflows #111

Is your feature request related to a problem? Please describe.
I’m working with spatial transcriptomics data and would like to integrate the segmentation results from Segger directly into the spatialdata ecosystem. Currently, this integration is not straightforward, especially when it comes to wrapping the output into a SpatialData object and aligning it with the corresponding H&E image.

Describe the solution you'd like
It would be helpful to have a utility function or module that:

1. Converts Segger output (e.g., per-cell predictions or boundaries) into a spatialdata.SpatialData object.
2. Supports alignment or overlay with the corresponding H&E image if available.

If this functionality already exists, a tutorial or documentation example would be incredibly helpful — perhaps added to the notebooks/ or docs/ directory. Happy to contribute or test any drafts.