db_schema.sql

Instead of using state-foo icons, use the corresponding emblems because
they are larger and don't have the 'cloud state' background.
Keep the existing names because I don't feel like churning
more of the codebase than necessary.

These new icons are from KDE Neon breeze-icon-theme 5.40, e.g.
breeze-icon-theme: /usr/share/icons/breeze/emblems/8/emblem-error.svg