Styles Route: Reference the api-fetch and html-entities projects

[youknowriad]

What?

Adds the two project references missing from routes/styles/tsconfig.json: api-fetch and html-entities.

Why?

The route declares both packages as dependencies, and since #81847 brought the route projects under the typecheck run, npm run lint:tsconfig requires every dependency to be matched by a reference. The styles route's config is missing these two, so the Static Analysis job currently fails on every branch, and the pre-commit hook blocks any commit that stages a tsconfig file.

How?

Two lines, in the alphabetical positions the validator expects.

Testing Instructions

npm run lint:tsconfig

Exits 1 on trunk naming these two references; exits 0 with this change.

Use of AI Tools

Authored with Claude Code (Claude Fable 5), including this description; reviewed by the PR author.

Verified: npm run lint:tsconfig exits 0 and npx tsc -p routes/styles/tsconfig.json reports no errors on this branch.

[github-actions]

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Co-authored-by: youknowriad <youknowriad@git.wordpress.org>
Co-authored-by: ciampo <mciampini@git.wordpress.org>

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[github-actions]

Flaky tests detected in f95c4ab.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/32735289788
📝 Reported tests:

Should save the changes in /test/e2e/specs/editor/plugins/wp-editor-meta-box.spec.js, passed after 2 failed attempts.

TimeoutError: page.waitForFunction: Timeout 10000ms exceeded.
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/plugins/wp-editor-meta-box.spec.js:34:14
TimeoutError: locator.click: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('role=button[name="Visual"i]')

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/plugins/wp-editor-meta-box.spec.js:33:55