Wrapped the `research_diversity` interpolation in the link-analytics "Recent Researches (N total)" header in `Number()`, matching the same coercion already applied to the sibling `🔍 N researches` badge in the same template. Closes a defense-in-depth gap (raw `${researchDiversity}` into `innerHTML` with no DOMPurify) left inconsistent by PR #3095. Not currently exploitable — the value is a Python `len(...)` int server-side — but aligns with the PR's stated scope of coercing numeric fields used in template-literal text positions.
