Add border around practice area (✓ Sandbox Passed)

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Description

This pull request adds a border around the practice area in the ViewPractice class.

Summary

• Changes made to ultra_type/view_practice.py
• Added border around practice area
• Initialized practice window with border and background color
• Updated display_typed_char method to return x, y coordinates

Fixes #47.

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Sandbox Executions

• [X] Running GitHub Actions for ultra_type/view_practice.py ✓

  Check ultra_type/view_practice.py with contents:

Ran GitHub Actions for c604e0449f4a0ab069bda752e350a6c7263d8c7d:

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Rollback Files For Sweep

• [ ] Rollback changes to True

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