Excellent resource, this is exactly what I needed. One bit of categorization that would also be particularly useful would be a kingdom category for "all star-able kingdoms", so those using the site to see what they need for their kingdom stars can easily filter out the guardians, classes, imps, and some of the mythics. And since you are currently working on the star tracking feature, it would also be nice to be able to filter by both a minimum and a maximum star amount (eg., to be able to exclude all troops from 7*+ kingdoms, since they are irrelevant for the time being, or only show what you need for kingdoms under 5*).
For those curious, I was able to use this to track my kingdom seven star progress by:
Inputting all the data
Individually selecting each kingdom currently seven starrable and "tracking" every troop that still needs traits
Selecting no kingdom, and using the checkbox under the heart symbol to show only the tracked troops
Deselecting "count hidden troops" in the checklist window
I now know exactly what I need to finish every troop in every kingdom that I can currently boost to seven stars. Technically, I need less than the amounts shown since I don't have to finish every troop in these kingdoms, but knowing the relative amounts of what I need total helps me make more informed decisions on which troops to skip and coupled with spoiler topics, where I need to farm. If I need to, I can modify the tracking list to remove troops I know are too expensive and I wont need as well.