Detect hyperlinks in property values

Property values of nodes/edges could contain hyperlinks. These values can be detected by ensuring the value has no spaces and starts with `http`. The detection can be even smarter than that if needed.

## Considerations

* SPARQL URIs would be detected with the simplistic algorithm above, but don't link to web pages
* Should we detect links within other text content?

No files, tests, or entry points are named. Begin by locating the component that renders node and edge property values, then clarify whether standalone HTTP values, SPARQL URIs, or links inside other text should be supported; done means the agreed link-detection behavior is implemented and verified in the relevant UI tests.

Written by the indexing model from the issue text.