Warn about small amounts of MB, not GB

[igfoo]

The number of GB is at most 2, and can be tiny. MB gives a more comprehensible range of values.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

PR Overview

This PR changes the disk space warning message to display available disk space in MB instead of GB for better clarity with small amounts.

• Updated disk space warning message in lib/util.js
• Updated disk space warning message in src/util.ts

Reviewed Changes

File	Description
lib/util.js	Replaced GB values with MB in the disk usage warning message.
src/util.ts	Replaced GB values with MB in the disk usage warning message.

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

lib/util.js:828

• The check still uses a threshold of 2 * gbInBytes while the message shows disk space in MB. For consistency, consider aligning the threshold with the displayed unit or adding a comment that explains the difference.

if (diskUsage.free < 2 * gbInBytes) {

src/util.ts:1059

• The disk space threshold is still based on GB units, whereas the warning message now displays MB. Consider aligning the units for consistency if that is your intention.

if (diskUsage.free < 2 * gbInBytes) {

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[henrymercer]

Makes sense, thank you!