Agent Skills: 1k-ui-snapshot-cache

UI snapshot cache (display-only, main-thread) + unified startup timing schema — cold-start reads from snapshot namespaces (MMKV on native, IndexedDB on web) and the cross-platform `[StartupTiming]` log taxonomy. Use when adding or debugging a UI snapshot / SWR cache, debugging startup performance regressions, analyzing cold start timeline, or comparing iOS vs Android startup phases. Triggers on: ui snapshot cache, SnapshotCache, swr cache, usePromiseResult cache, cold start, startup optimization, 启动时间, SSR hydration, Balance displayed regression, contextAtomBase, flushColdStartCache, __ONEKEY_CTX_ATOM_SNAPSHOT__, StartupTiming, main_host.did_start, bg_runner.start.