chore: improve lazydocker maintenance path

[otjdiepluong]

Summary:

• Add table-driven unit tests for existing helper functions in pkg/utils/utils.go (e.g., FormatBinaryBytes, FormatDecimalBytes, ApplyTemplate, Min) covering edge cases like zero values, negative inputs, and large numbers; extend utils_test.go without changing production behavior.
• Keep the change narrow so it is straightforward to review.

Notes:

• I kept this scoped to the relevant implementation and tests.