Add test for non-numeric input in level-0/02-calculator-basics

[travisjneuman]

Description

The calculator basics project should handle cases where the user enters text instead of a number. Add a test that verifies the program handles non-numeric input without crashing.

Acceptance Criteria

• Add a test in projects/level-0/02-calculator-basics/tests/ for non-numeric input
• Test should verify a clear error message or graceful handling
• Existing tests still pass

[travisjneuman]

Resolved in 36dceb1: Added test_calculate_non_numeric_input to level-0/02 tests.