docs: add coinbaseWallet connector links to sidebars

[Keemosty12]

This adds missing coinbaseWallet entries to the React, Vue, and Core connectors sidebar lists, ensuring the existing connector docs are discoverable from aggregated connectors pages.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7e0288c

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[vercel]

@Keemosty12 is attempting to deploy a commit to the Wevm Team on Vercel.

A member of the Team first needs to authorize it.