V.C. Billingsley2/20/2026, 8:04:00 AM

Category legend now supports selecting multiple categories simultaneously
instead of toggling one at a time. A single delegated click listener
replaces per-item listeners, surviving reloadGraph rebuilds. A "CLEAR ALL"
button appears at the top when any categories are active.

When OAuth credentials are not configured (no GITHUB_CLIENT_ID), the app
enters demo mode with a fallback user instead of showing a broken login
screen. The server now returns oauthConfigured in /api/me so the client
can decide. If the server is unreachable entirely (plain vite dev), demo
mode also activates.

renderAuthButton handles null avatars with an inline GitHub SVG fallback
instead of a broken <img> tag.

Parent8f7908e