fix(message-format): preserve selectors, inputs, and local ordering

[samuelstroschein]

Summary

• Parse every selector match component independently so exported multi-selector messages reimport without whitespace-corrupted selector names or catchall values.
• Continue discovering placeholders after an already-declared input, preventing missing message inputs and downstream compiler errors.
• Export without mutating caller-owned declarations or variant matches, while preserving dependency order for chained local declarations.
• Add focused regression coverage and a patch changeset for @inlang/plugin-message-format.

Verification

• pnpm test in packages/plugins/inlang-message-format (64 passed, 1 skipped; includes TypeScript checking).
• pnpm run build in packages/plugins/inlang-message-format.
• Prettier check for all modified plugin TypeScript files.
• Independent subagent reviews approved the importer and exporter changes.

[changeset-bot]

🦋 Changeset detected

Latest commit: e9aa9ed

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@inlang/plugin-message-format	Patch

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	inlang-website	e9aa9ed	Commit Preview URL Branch Preview URL	Aug 25 2026, 06:47 AM