fix(sanity): align workspace dependency versions

[eoinest]

Summary

• align gt-sanity's Sanity development and type dependencies with Sanity 5.31.1
• align its React development peer context with workspace consumers
• regenerate the pnpm peer dependency graph so workspace consumers receive compatible Sanity types
• declare the Node.js versions supported by Sanity 5.31.1
• add a patch changeset for gt-sanity

This fixes both the duplicate Sanity 5.19/5.31 identities and the split React peer variants that made gtPlugin() incompatible with a consumer's defineConfig().

Testing

• pnpm --filter gt-sanity typecheck
• pnpm --filter gt-sanity test (149 tests)
• pnpm --filter gt-sanity build
• temporary compile check combining defineConfig() from Sanity 5.31.1 with gtPlugin()
• pnpm exec oxfmt --check packages/sanity/package.json .changeset/align-sanity-workspace.md
• git diff --check

Notes

PR #1977 is retargeted to this branch as a dependent stacked PR.

Greptile Summary

This PR aligns gt-sanity with the workspace’s Sanity and React versions. The main changes are:

• Upgrades Sanity development and type dependencies to 5.31.1.
• Aligns React development dependencies with workspace consumers.
• Updates the supported Node.js range.
• Regenerates the pnpm dependency graph.
• Adds a patch changeset for gt-sanity.

Confidence Score: 5/5

This looks safe to merge.

• The updated Node.js range matches Sanity 5.31.1 and resolves the reported compatibility gap.
• No blocking issue remains in the changed code.

Important Files Changed

Filename	Overview
packages/sanity/package.json	Aligns Sanity and React dependencies and matches the Node.js range required by Sanity 5.31.1.
pnpm-lock.yaml	Regenerates workspace resolutions for the updated Sanity and React dependency graph.
.changeset/align-sanity-workspace.md	Adds a patch release note for the dependency alignment.

_{Reviews (3): Last reviewed commit: "fix(sanity): skip obsolete Node engine c..." | Re-trigger Greptile}

[eoinest]

@greptileai

[eoinest]

@greptileai