The S2 seed effect ran on the saved-views query's first resolve, but that
query is ungated and — since SavedViewsProvider mounts above <App>, which pins
the tab-account only after /api/me — resolves before the account is known on a
fresh tab. It then evaluated canSeedDefault() against a null account (which
reports 'stored, do not seed') and burned its one-shot guard, so the starred
default was never applied until a reload: exactly the fresh-tab miss S2 set out
to fix. Gate the effect on the reactive account id so it defers instead of
consuming the guard, and re-fires when the account pins. Covers feed + plex.
Adds a dom test for the defer-then-seed-on-pin path the old test masked by
pre-pinning the account.