feat(brand): 3D pixel-heart icon and updated site tagline

- Site favicon/mod icon: aligned voxel heart mark with lightning-bolt
  side notches, crisp pixel edges, centered bounding box
- Landing hero + meta description updated to "visuals you'll fall in
  love with" (RU/EN), no em dashes
- fabric.mod.json now points at the new mod icon asset

Claude-Session: https://claude.ai/code/session_01F1M1Jic1wTSn4igUENynmZ

mod/src/main/resources/fabric.mod.json

@@ -4,6 +4,7 @@
   "version": "${version}",
   "name": "LoVisual",
   "description": "A Minecraft utility client.",
+  "icon": "assets/lovisual/icon/icon.png",
   "authors": [
     "loki5512344"
   ],