Polished blog reading and reliable interview link previews

• A polished new reading experience for blog posts. Long-form articles now feature an "In this article" table of contents that anchors directly to each section, one or two context-relevant product suggestions woven into the reading, and a curated list of related reads in the same category at the end. Section headings click-to-anchor cleanly under the top navigation.
• The blog home is now Field notes on conversational AI. The index reads like an editorial publication, with the same category bar and post grid you already use.

Shared interview link previews on social platforms now reliably show the host's avatar.