Character creation submits API request + remove GP purchase prompts + add preset choices

[kevy-kev]

Added preset options

Options are from https://docs.google.com/document/d/1nC8yE41VKEKRrG_xo-Sxzk-MY3mSE6uo-KQhAJOcwkA/edit

Submits POST request to /character-sheet

Submits a JSON body adhering to CharacterDetails schema

Added short backstory input field to fit the schema

UI updates

• Added the shadow at top and bottom that trigger based on scroll distance
• Added form validation to disable submit button until form is complete, as well as notify user it's not complete yet
• Added some slight animation
• Previously clearing the text input box when no preset was selected wouldn't clear the value in the state - this was fixed

https://github.com/Legend-Mama/legend-mama/assets/113942748/dbde07ea-db7e-4575-94e4-0f215e55f909

Removed info about purchasing GP, updated GP info

Added tooltip on question mark, and right now we just reset GP to 3 every day so the purchase button was removed

Changed "pricing info" to "usage info" and added info about image generation GP cost

[github-actions[bot]]

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