docs: refresh the project social preview

[btravers]

Apply the approved btravstack website social-card composition to tools: a prominent project name, short headline, project accent, and a larger version of its existing beetroot mascot.

Replaces the local 1200 × 630 preview PNG. The illustration itself is unchanged. The editable shared source is maintained in website PR #50.

Validation: rendered in Chromium after fonts and images loaded; checked at full and 600 × 315 thumbnail size; local asset verified identical to the canonical export. This PR changes only the image.

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-07T09:15:58.053171Z	135e79b	PR opened

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