chore: update Yarn to 4.18

[tiye]

Summary

• Pin Yarn 4.18.0 in the package and CI, retaining the existing node-modules linker.
• Keep Calcit 0.18.1 and Respo module versions unchanged; no generated files are committed.

Validation

• yarn install --immutable passed with scripts disabled.
• Matching Calcit 0.18.1 toolchain verification, snapshot formatting, default-entry check, and zero dynamic-method gate passed.
• JS generation and Node 24 Vite production build passed locally.

Summary by CodeRabbit

• Chores
  • Updated the tooling used to prepare and publish releases.
  • No changes to application features or behavior are included in this update. The change affects the release process only, so there are no new user-facing capabilities or interface changes to highlight. All other release workflow steps remain unchanged.

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 7ee60c5d-61f3-4920-922d-285a5c64662a

📥 Commits

Reviewing files that changed from the base of the PR and between a0bd8ee and 9dc4311.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (2)

• .github/workflows/upload.yaml
• package.json

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< In software, we rarely have meaningful requirements. Even if we do, the only measure of success that matters is whether our solution solves the customer's shifting idea of what their problem is. - Jeff Atwood >
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