The salvaged guard covered only the save path. Validate, activate and delete completions
from a profile-A instance could still set state, fire onConfigSaved / onMainModelChanged
and toast after SettingsView remounted the panel under profile B — the identical stale-
completion race, three more doors. The same `mounted` ref now gates all four handlers
and `refresh()`.
Test: the salvaged vitest file now partially mocks `@/hermes` (the profile-scope note
subscribes to `setApiRequestProfile` at import time) and stubs `ActiveProfileNote`.
Closes#69451 (renderer `profileScoped()` forwarding, backend `_config_profile_scope`
and the profile-keyed remount landed on main earlier; this closes the last atom).
Salvage of #69452.
55c92fa32a