Significant UI improvements

This devlog was basically just me messing about with tailwind classes until it looked good. i took some inspiration from the Hack Club Bank transactions page as well, which was helpful as a reference.

New features include:

• JetBrains Mono & Inter font
• Date formatting
• Transaction description and account name formatting (no more full upper case)
• Table layout for transactions
• Account balance shown on home page (this needed a new API endpoint)
• Mobile UI styling
• Pending transaction badge
• Skeleton loader for transaction page