The Versions page only rendered the INSTALLED CHANGELOG.md, so the operator
couldn't see what an available update contained until after applying it. Now,
when behind a published release, a "What's new in vX.Y.Z" panel shows the
changelog of the available version(s) — fetched from the remote CHANGELOG.md at
the latest tag (Gitea raw API, anonymous/read-only, briefly cached), parsed with
the shared changelog parser and filtered to versions newer than installed.
Degrades gracefully: a failed fetch yields an empty preview and never blocks the
update button. Refactored releases() to a reusable parseChangelog().
Tests: preview lists only newer versions + renders their entries; no preview
when current. 362 pass, Pint clean, /versions loads 200 with no console errors,
versions lang parity 51/51.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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