Defer and coalesce omnivoice.app and omni_ui persistence behind a 250 ms
quiet window with a 1,000 ms hard maximum, preserving storage schemas,
synchronous pending reads, legacy formats, Factory Reset semantics,
widget read-only ownership, and lifecycle (pagehide/visibilitychange)
durability. Adds scheduler, restore, reset, StrictMode, concurrent-render,
role-ownership, and migration regression tests plus an opt-in
production-bundle responsiveness harness.
Lands #1541 by @bultodepapas (maintainer landing branch; the out-of-scope
attribution-policy commit was dropped).
Co-authored-by: Gius <bultodepapas@gmail.com>
