Fix favicon rendering in portfolio project cards

[DavidAlexandre93]

Motivation

• Project card favicons were often broken because the code fetched favicon.ico directly from raw.githubusercontent.com/<owner>/<repo>/..., which frequently does not exist.

Description

• Use the Google S2 favicon service instead by generating the image URL with https://www.google.com/s2/favicons?sz=256&domain_url=${encodeURIComponent(repository.homepage || repository.html_url)} in src/components/sections/Portfolio/index.tsx so cards use the repository homepage (or repository URL) as a reliable favicon source.

Testing

• Ran npm run build which failed with vite: not found, ran npm ci which failed with 403 Forbidden when fetching packages, and attempted a Playwright screenshot which failed with ERR_EMPTY_RESPONSE, so no successful local build/test could be completed in this environment.

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Codex Task

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