fix(docs): replace broken appLogoUrl example URL (404) with working URL in 6 SDK files

[schoolkamsergj]

Problem

The example appLogoUrl value https://base.org/logo.png used across 6 SDK documentation files returns 404.

Verification:

curl -sI https://base.org/logo.png
→ HTTP/2 302 → https://www.base.org/logo.png
→ HTTP/2 404

Developers copying these examples see a broken logo in the Base Account SDK popup.

Fix

Replaced the broken URL with the official Base GitHub organization avatar https://avatars.githubusercontent.com/u/108554348?s=200&v=4 which returns HTTP 200 and is stable.

Files changed (6)

• docs/base-account/improve-ux/sponsor-gas/paymasters.mdx
• docs/base-account/improve-ux/batch-transactions.mdx
• docs/base-account/improve-ux/spend-permissions.mdx
• docs/base-account/improve-ux/sub-accounts.mdx
• docs/base-account/quickstart/web.mdx
• docs/base-account/quickstart/web-react.mdx

Closes #1316

[cb-heimdall]

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