Rename extension to lead with the ReFlip brand (v1.0.1)

Store showed the manifest name ('Depop ⇄ Vinted cross-lister'); user
expected the ReFlip brand. Renamed to 'ReFlip — Depop ⇄ Vinted
cross-lister' - leads with the brand, keeps the searchable keywords.
Bumped version 1.0.0 -> 1.0.1 (required to upload a new version).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>