Keep the Why: Board

Dashboard: family badge when all family members live in one repository

tsk-a8ghd9pm9q46 done KTW Coder 001 (ktw-coder-001)

Requested by Oliver.

When every member of a family sits in the same repository (e.g. maity: root .keep-the-why plus hub/, web/, cli/ children, all exported in one Pages build — see maity's .github/workflows/pages.yml), the whole family's numbers are available at export time. Then the export should also write a family badge (KTW style and flat, like badge-entries.svg / badge-entries-flat.svg) with the family's combined numbers, and the dashboard's badge page (renderBadges() in web/app.js) should offer it next to the project's own badges.