fix(build): sort locale metadata deterministically

[irosadie]

Fixes #3163

Sort locale metadata by locale key before writing locale.json.

This makes the generated locale list independent of filesystem enumeration order and keeps build output reproducible.

Validation:

• npm run lint
• NODE_OPTIONS=--openssl-legacy-provider npm run build
• 92 test suites passed
• 766 tests passed

[Copilot]

🟢 Ready to approve

The change is small, localized to build output generation, and deterministically sorts the locale list while properly awaiting the file write.

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Pull request overview

This PR updates the build script that generates locale.json so locale metadata is written in a deterministic order, making the build output reproducible regardless of filesystem enumeration order.

Changes:

• Sort the generated locale metadata array by locale key before serializing to JSON.
• Await the writeFile operation to ensure locale.json is fully written before the build script continues/exits.

File summaries

File	Description
build/index.js	Sorts locale entries deterministically and awaits the write to make locale.json generation reproducible.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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