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* perf(renderer): stop full durable-state save on every top-level view switch (#9002) Persist activeView in a tiny profile-scoped sidecar instead of mutating the monolithic recovery snapshot. Active-view-only updates now bypass the broad UI normalization and durable save scheduler, while a 100ms atomic writer coalesces rapid switches and a synchronous shutdown checkpoint closes the immediate-exit race. Legacy state remains a migration and downgrade fallback. Coordinate renderer shutdown capture through one guarded checkpoint so workspace sessions and the active-view preference both survive graceful reloads, restarts, and quit cancellation. Add a persistence-boundary test proving the sidecar stays below 64 bytes while orca-data.json remains byte-for-byte unchanged, plus repeated Windows Electron restart coverage and a path-normalization-safe restart fixture. * harden active-view sidecar: prototype-safe validator, race-free async swap, independent shutdown flush - isTopLevelView uses Object.hasOwn so a corrupt sidecar can't smuggle inherited keys (constructor/__proto__) through as a valid view. - writeAsync guards the generation check and rename synchronously (renameSync) so a shutdown flushOrThrow can no longer interleave and let a stale async rename clobber the freshly-written view. - shutdown checkpoint flushes the durable store and the active-view sidecar in independent try/catch blocks so one store's failure can't skip the other. Added regression tests for all three. Co-authored-by: Orca <help@stably.ai> --------- Co-authored-by: OrcaWin <293788423+OrcaWin@users.noreply.github.com> Co-authored-by: Neil <4138956+nwparker@users.noreply.github.com> Co-authored-by: Orca <help@stably.ai>