v0.166.1

Client: a cancelled build-mismatch reload no longer stalls later navigations (folio#2750)

Fix (patch). Nothing to change in apps.

• Since 0.165.0 a navigation answered by another build loads the target page in full. When that load was cancelled ("Stay" on a beforeunload prompt, e.g. a dirty editor), gemi stayed latched as if a load were still under way: every later cross-build navigation was discarded with no new load, even to another URL or after the cooldown.
• The "load under way" state now lasts only for the navigation that started it (and at most the cooldown). After a cancel, a later mismatch on another URL loads it in full; the same URL inside the cooldown renders the data (as any refused reload does); the same URL after the cooldown loads in full again. Chunk-load recovery (recoverFromChunkLoadError) shares the guard and gets the same fix.
• The navigation whose load was cancelled keeps the current page on screen, as the user asked by choosing "Stay".