fix(seo): shorten page titles to under 60 characters

Shorten titles that exceeded 60 chars to prevent truncation in search results:

- garbage-collection: 67 → 47 chars
- object-methods: 65 → 44 chars
- tagged-template-literals: 64 → 50 chars
- proxy-reflect: 63 → 47 chars
- javascript-type-nuances: 61 → 44 chars

Per ahrefs SEO recommendation: titles should be 50-60 chars (max 600px).