Fix misleading test description for 0 bytes filesize handling

[Copilot]

The test for getValue() returning an empty string when filesize is 0 incorrectly attributed this behavior to isVisible hiding the value. The actual cause is the truthy check in getValue() itself.

Root cause

The getValue implementation uses a truthy check:

getValue: ( { item }: { item: MediaItem } ) =>
    item?.media_details?.filesize
        ? formatFileSize( item?.media_details?.filesize )
        : '',

When filesize is 0, the truthy check treats it as falsy and returns an empty string before formatFileSize() is ever called. The formatFileSize() function itself would return "0 B" if it received 0.

Changes

• Updated test description from "handled by isVisible" to "due to truthy check"
• Updated inline comment to accurately explain the truthy check behavior treating 0 as falsy

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