graphiql 5: fix color in the F1 popup should be graphiql primary color

[dimaMachina]

fix popup from blogpost https://graphql.org/blog/2025-07-17-graphiql-5/

[changeset-bot]

🦋 Changeset detected

Latest commit: d56a504

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

This PR includes changesets to release 6 packages

Name	Type
@graphiql/react	Minor
graphiql	Patch
@graphiql/plugin-code-exporter	Major
@graphiql/plugin-doc-explorer	Major
@graphiql/plugin-explorer	Major
@graphiql/plugin-history	Major

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[github-actions]

The latest changes of this PR are available as canary in npm (based on the declared changesets):

graphiql@5.1.1-canary-5c0dbbb8.0
@graphiql/plugin-code-exporter@5.1.1-canary-5c0dbbb8.0
@graphiql/plugin-doc-explorer@0.4.1-canary-5c0dbbb8.0
@graphiql/plugin-explorer@5.1.1-canary-5c0dbbb8.0
@graphiql/plugin-history@0.4.1-canary-5c0dbbb8.0
@graphiql/react@0.37.0-canary-5c0dbbb8.0