Rebrand the forked Photon project to Kelp, the Coves web frontend. This is standard practice after forking - users should see Coves/Kelp branding, not the upstream Photon name. Changes: - Rename package from "photon-lemmy" to "kelp-coves" - Update PWA manifest name/description for Kelp/Coves - Rename photonify() to localizeLink() across codebase and tests - Rename Photon icon export to Kelp, PHOTON_DEFAULT to KELP_DEFAULT - Update all 17 i18n files (Photon -> Kelp, with proper declension) - Update source links to tangled.org/bretton.dev/coves-frontend - Rewrite README with Kelp identity and Photon attribution - Fix NSID casing: getprofile -> getProfile Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>