A click on a child of an <a> (e.g. nested <strong>, <em>, <code>, icon)
made event.target a non-anchor, so getAttribute('href') returned null
and the handler bailed without preventDefault. The browser then
performed the native navigation, which for relative links like
'../note.md' resolved against the current /:user/:repo URL and the SPA
re-routed treating the destination as a new repo.
Smooth-scroll for the anchor jump when the target note is already
stacked, instant otherwise. While threading the new flag, the four
positional params got hard to read, so collapse them into
{ noteId, notes, hash, smoothHash } and update all call sites.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
