Add hover tooltips to social buttons; update Stack Overflow icon

[TimoStaudinger]

What changed

Hover tooltips on the social buttons (Social.tsx)

• Each icon now shows the site's name as a small caption below it on hover and keyboard focus, colored in that network's accent color (matching the existing hover-circle tint).
• Links also gained aria-labels — they previously had no accessible names.
• The footer got symmetrical 30px top/bottom padding (Layout.tsx) so the caption stays inside it instead of extending the page height on hover.

New Stack Overflow icon (StackOverflow.tsx)

• Redrawn for Stack Overflow's 2026 rebrand: the tray/bracket is gone, replaced by a fan of four bars (12° spacing), hand-drawn in the same Feather stroke style and sized to optically match the neighboring icons. Neither react-feather nor simple-icons ships the new mark yet.

Notes for review

• The visual regression snapshots for /uses (and possibly /) are intentionally stale — the footer is taller and the icon changed. Expect the update-snapshots CI job to push a snapshot-refresh commit to this branch after the first test run.
• Verified locally: yarn build passes; the only Playwright failures are the known stale snapshots above plus the pre-existing home mobile rendering drift on macOS.

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Project	Deployment	Actions	Updated (UTC)
timostaudinger-com	Ready	Preview	Aug 22, 2026 1:38am