Really good stuff!

If I can give another suggestion: I think it would be much more useful for beginners to see the common alias of the chord in the main table (maybe below the name that already exists?).

(This is wrong, see the reply below:) For example, a beginner may see "G7" in the wild and not know it's a G minor 7 (and not a G major 7). They'd have to click the chords and search the alias list. If "G7" was written below "G minor 7", it would make things much easier.

Also, I think it would look better if the names in the main table were a bit more consistent. For exmaple, you have "G major ninth" but "Gmaj13". I think it would be better to have them as "Gmaj9"/"Gmaj13" or "G major ninth"/"G major thirteenth".