fix: preserve footer social target sizes

[vsolano9]

Summary

• keep all footer social icon boxes at 16 by 16 pixels on narrow screens
• give each social link a minimum 24 by 24 pixel target
• wrap and tighten the narrow-screen social row instead of compressing its icons

Fixes #2456

Validation

• npm run check
• npm run test:unit (52 passed)
• npm run build (2,307 pages built)
• focused 390 by 844 Playwright regression in Chromium, Firefox, and WebKit (3 passed)
• measured all seven social links at 24 by 24 pixels and all seven SVG boxes at 16 by 16 pixels, with no horizontal overflow

The complete local homepage run passed all 24 non-locale cases. Its 27 locale-switch cases reproduced the known local dev-server 404 mismatch; the supported Netlify preview workflow will run the complete browser suite.

AI assistance

OpenAI Codex assisted with implementation, test authoring, validation, and pull request preparation.

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