Thanks for this project - it's pretty amazing! Some odd little things I noticed related to the sharing feature:
For some reason, the share URL feature is giving me "%2E%2C" instead of comma. If it matters, I'm using Chrome in incognito with UBlock Origin and Duckduckgo. Manually finding and replacing makes the feature work properly.
I suspect this is related, but even manually changing the "%2E%2C"" to commas automatically drops the last category in the URL. This is fairly easily resolved by appending ".,dummy" (or something similar) to the end.
Hopefully these should be easy fixes!