fix(rolldown): use decimal bytes for file sizes

[webfansplz]

Close #268

DevTools was using binary (1024) conversion while labeling sizes as KB/MB. By convention, kB/MB should be decimal (1000), while binary units should be labeled KiB/MiB.

This change switches DevTools to decimal-based size formatting, and also align with the rolldown_plugin_vite_reporter.

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commit: 6772144

[Copilot]

Pull request overview

This PR updates DevTools file size formatting to use decimal (1000-based) conversion so the displayed units (kB/MB/GB…) match SI conventions and align with rolldown_plugin_vite_reporter.

Changes:

• Switch bytesToHumanSize from 1024-based to 1000-based scaling and update unit label to kB.
• Update unit tests to reflect 1000-based thresholds.
• Adjust FileSizeBadge thresholds from 1024 to 1000.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
packages/rolldown/src/app/utils/format.ts	Converts byte formatting to decimal (1000) and updates displayed units.
packages/rolldown/src/app/utils/tests/format.test.ts	Updates expectations for decimal thresholds and kB unit label.
packages/rolldown/src/app/components/display/FileSizeBadge.vue	Aligns size thresholds with decimal kilobytes (1000).

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