Two pieces of drift introduced in 305170a (Regulated Power Supply):
1. The committed components-metadata.json carries a custom rich
thumbnail SVG (showing 5.00V / 1.00A / PSU labels), but the
_customComponents override has no `thumbnail` field — so any
regen via `npm run generate:metadata` replaces it with the
generic placeholder. CI catches the drift and fails.
Fix: lift the rich SVG into the override entry.
2. The committed metadata description is a short one-liner while
the override description is the longer explanatory version.
The override is the source of truth, so the metadata now
matches: longer description wins.
Verified locally: regenerator now produces zero diff against the
committed metadata.
391817d2c9
