Re-sync the engine, point everything at GitHub

The vendored copies of printlayout.ts, paper.ts, printoversize.ts and
tokens.css now match Klarbild 1.0.0 as published. Source links go to GitHub
only — the self-hosted Gitea is the origin, not the public face. Screenshots
and the two stated counts refreshed from the current build.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Nh4A79bbqT9dcd2inzYUdg

README.md

@@ -24,6 +24,7 @@ npm run dev
 
 ```bash
 cp ../klarbild/src/lib/{printlayout,paper,printoversize}.ts src/engine/
+cp ../klarbild/src/styles/tokens.css src/styles/tokens.css
 # printoversize.ts imports './printlayout.ts'; drop the extension for the bundler
 sed -i "s#from './printlayout.ts'#from './printlayout'#" src/engine/printoversize.ts
 ```