Home's checkForRemoteChanges compared fresh pinned docs against what
was displayed, but the pinned fetch (listPins isn't a cached endpoint)
silently collapsed any failure to [] — every poll while offline
compared "[]" against the real non-empty pinned list, which always
looked like a change and popped the banner every ~45s. Split fetchPinned
into a throwing variant checkForRemoteChanges can bail on (matching the
already-correct pattern in CollectionsViewModel/DocumentsViewModel,
which don't have this bug), keeping the non-throwing version for the
initial load where collapsing to [] is the right behavior.
RootView's auto-flush was keyed only to session.networkMonitor.isOnline
— turning the manual Offline Mode toggle back off while the real
network had been up the whole time never changes that value, so queued
operations sat stuck until the next real network blip. Keyed the flush
(and the Full Local Sync loop's online check) to a combined
isEffectivelyOnline instead, so either signal clearing resumes sync
immediately.