fix api key and endpoint

endpoints for check answer and creating puzzle migrated to new server to remove rate limiting.

changing minimum os requirement from 18.2 to 15.0 . regenerate puzzles once running out so there will always be puzzles to solve.

create and share puzzles with users. enter in plain text the kind of puzzle and type you want to create and share with a user using their email. An email will be send to the user, which contains an app deeplink, which has been mapped to the app. If opened on desktop the user can play the puzzle on desktop as well. Sign in/ sign up with email and password if you dont have an gmail or apple account or dont want to use them for some reason. View the created custom puzzles with their own leaderboards.

Add Leaderboard to track top scores in Settings

chat with AI to better understand the answer and evaulation process. Confused why your answer was marked wrong? Click on the feedback popup and chat with the AI as to why you were graded that way, correct or wrong. Continue the conversation to learn more about the topic.

UI fixes for buttons disappearing under keyboard.

show hint button. which shows hint for current question.

new puzzle type: Math is available

change the UI as the bottom half is occupied by the keyboard, the answer section is being covered. This change flashes the correct answer at the top and tells clearly if the user was correct or not. For long story puzzles, there is the option of tapping on the question and it pops up with a scroll bar if it is too long. removed settings button from sign in page as it doesnt do anything.