docs: add Coinbase wallet API

[probablyangg]

Summary

• list Coinbase Developer Platform in the Wallets ecosystem table as embedded/in-app wallet infrastructure
• document its user-auth and API-key wallet models, supported capabilities, and Stable compatibility
• link to Coinbase's official non-custodial wallet documentation

Why

Developers evaluating wallet infrastructure for Stable need an accurate description of Coinbase's current wallet API and a direct path to its official setup guidance.

Validation

• ran npm run check with Node 22.22.1
• reviewed the ecosystem row and developer section in the local Vocs preview
• confirmed the Coinbase documentation link returns HTTP 200
• confirmed the rendered page has no console errors or horizontal viewport overflow

[github-actions]

Styleguide check

✓ 132 en pages — 0 blocking, 11 warnings

docs/pages/en/explanation/autobahn.mdx

• ⚠ warning: marketing word "robust" (L20)
• ⚠ warning: marketing word "seamless" (L34)

docs/pages/en/explanation/consensus.mdx

• ⚠ warning: marketing word "robust" (L32)

docs/pages/en/explanation/ethereum-compatibility.mdx

• ⚠ warning: marketing word "seamless" (L10)

docs/pages/en/how-to/monitor-node.mdx

• ⚠ warning: marketing word "comprehensive" (L7)

docs/pages/en/how-to/troubleshoot-node.mdx

• ⚠ warning: marketing word "comprehensive" (L7)

docs/pages/en/reference/indexers.mdx

• ⚠ warning: marketing word "seamlessly" (L9)

docs/pages/en/reference/ramps.mdx

• ⚠ warning: marketing word "seamless" (L28)

docs/pages/en/reference/system-transactions-api.mdx

• ⚠ warning: marketing word "comprehensive" (L358)

docs/pages/en/reference/wallets.mdx

• ⚠ warning: marketing word "powerful" (L87)
• ⚠ warning: marketing word "seamless" (L34)

_{Enforced by npm run style:check — see STYLEGUIDE.md.}

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	docs	78fab19	Commit Preview URL Branch Preview URL	Aug 12 2026, 05:28 AM