Remove Lowercase Input Manipulation

[mystiker]

This PR removes the logic in the frontend that automatically converted two-character inputs to lowercase. The MUD backend now handles lowercasing where applicable, making this frontend behavior redundant.

Changes

• Deleted the code responsible for automatic lowercasing of two-character inputs in the frontend.
• Verified that the frontend no longer modifies input case automatically.
• Confirmed compatibility with the MUD backend's new handling of lowercasing.

Fixes #139

[myonara]

ok to porceed.