fix: use byte-safe indexing in style encapsulation to prevent UTF-8 panics#248

Brooooooklyn merged 2 commits intovoidzero-dev:mainvoidzero-dev/oxc-angular-compiler:mainfrom

BenjaminDobler:fix/utf8-char-boundary-panicBenjaminDobler/oxc-angular-compiler:fix/utf8-char-boundary-panicCopy head branch name to clipboard