Upgrade Turborepo to v2.5.8 and lock version to prevent branch inconsistencies

[Copilot]

Problem

The repository was using "turbo": "latest" in package.json, which caused different branches to install different major versions of Turborepo. Some branches would get v1.x while others would get v2.x, leading to configuration errors because:

• Turborepo v1 uses pipeline in turbo.json
• Turborepo v2 uses tasks in turbo.json

This inconsistency caused build failures when switching between branches or when different developers had different versions installed.

Solution

This PR locks Turborepo to version ^2.5.8 and updates the configuration syntax to match v2:

1. Locked Turborepo version: Changed "turbo": "latest" to "turbo": "^2.5.8" in root package.json
2. Updated configuration syntax: Changed pipeline to tasks in turbo.json to match Turborepo v2 format
3. Updated yarn.lock: All turbo-related dependencies are now locked to version 2.5.8

Testing

• ✅ Verified turbo version is now 2.5.8
• ✅ Tested yarn lint - working correctly
• ✅ Tested yarn build - working correctly
• ✅ Tested yarn test - working correctly

Migration Notes

This upgrades the repository from Turborepo v1 to v2. The main breaking change is the configuration file syntax (pipeline → tasks), which has been updated in this PR. All existing scripts and workflows continue to work without modification.

Closes: Issue regarding turborepo version inconsistencies causing pipeline/task naming errors

Original prompt

upgrade to latest turborepo - we currently seem to not have it locked causing some of my branches to use newest some older - causing errors in turborepos turbo.json with pipeline/task naming. so if we just lock it to newest that would save a lot of trouble

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[changeset-bot]

🦋 Changeset detected

Latest commit: 2499e02

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

This PR includes changesets to release 1 package

Name	Type
@tokens-studio/figma-plugin	Patch

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