Update notes ver. 1.4.0

Added a challenge mode themed after Heart-cut gemstones.
By clearing the tenth type of gemstone with a B rank or higher from the start of the game, you can unlock the "Heart Challenge."
In the Heart Challenge, you'll face challenges related to 12 types of gems, and the total number of trophies will be recorded as your score.
High scores will be recorded for each gemstone, and you can retry at any time of your choosing.
Gems created will be added to the collection just like in the normal mode.

You can now delete only the records of the "Birthstone Challenge" and "Heart Challenge."
Fine-tuned the shapes of some gems.
Fine-tuned some parts of the UI.