cync_lan (Home Assistant custom_component) v2.4.1

A proper icon. The integration now uses the Cync mark from the Home
Assistant brands repository - the same one Home Assistant already shows for
Cync devices - with a blue "LAN" badge in the corner marking it as the
local-control integration rather than the official cloud one. The previous
icon was a generic bulb.

Dark-theme variants are included for the first time, so the mark stays
visible on a dark background instead of being a black glyph on black.

Where it shows up: Home Assistant serves brand images out of an integration's
own brand/ folder from 2026.3.0 onwards, so on that version or newer the
icon appears on the integrations page and in HACS once the integration is
installed. It will not appear in the HACS browse-and-download list before
installation - nothing is on disk to serve at that point, and that listing
falls back to the central brands CDN, which has no entry for this domain.
Getting it there needs a pull request against home-assistant/brands.

Icons are regenerated by scripts/make_brand_icons.py. Provenance and the
trademark notice that travels with the source art are recorded in
LICENSE-3RD-PARTY.

Cosmetic only - no functional change.