- Gate the unsynced-only note on pendingUnits (not meterUnits) and interpolate
pendingUnits directly, so the "pending sync from linked instances" wording is
always exact — robust to a hypothetical zero-doc entry carrying synced units.
- Pluralise the key (unitsPending_one/_other + count) so it reads "1 meter unit"
not "1 meter units", matching the project's _one/_other convention.
(Headline still shows the synced PDF count — "0 PDFs" in the unsynced-only state
is by design: count dimension vs meter units, with the note explaining the gap.)