Use relative GraphiQL asset paths

[alfonso-noriega]

WHY are these changes introduced?

The GraphiQL server resolves package-local assets through @shopify/cli-kit/... package imports. Newer Nx lint rules flag that as a same-project boundary violation and have blocked dependency-update PRs.

WHAT is this pull request doing?

• Reads the GraphiQL favicon and stylesheet via paths relative to server.ts instead of resolving them through the package import alias.
• Updates the bundling rewrite plugin to handle those relative asset URLs and keep bundled CLI asset resolution working.

How to test your changes?

• pnpm nx run cli-kit:lint
• pnpm vitest run packages/cli-kit/src/public/node/graphiql/server.test.ts
• pnpm nx run cli-kit:type-check
• pnpm bundle-for-release

Post-release steps

None.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• This change is not user-facing and does not need a changeset.

[alfonso-noriega]

• Use relative GraphiQL asset paths #8010 👈 (View in Graphite)
• main

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