Each behaviour here was verified by removing the code that provides it and
confirming the test went red, then putting it back. Two of them did not, and
both were rewritten rather than kept:
The restore-side persister check asserted that the delegate's own dashboard
could not be read back inside a shared record. Deleting the guard left it
green, because the record-scoped hash already makes a snapshot written in one
record unreadable in another. It now counts what landed in the cache, so the
guard it names is the thing it measures — and the weaker line is kept beside
it with a note saying why.
The switcher's account rows were asserted from server-rendered markup. Radix
portals do not render server-side at all, so an earlier draft was measuring
the renderer. Those rows moved to the browser suite; what stays here is the
gate, which fails sharply — with the `canSwitch` bail removed the two cases do
not return different markup, they throw.
Two more shapes worth naming. The cache dimension is exercised through a real
QueryClient built from the app's own defaults, because "the hash string
changed" and "one record's data cannot be read while inside another" are
different claims. And the invalidation is a plain function over a client with
three live entries seeded, with a test that asserts they start valid — without
it, a client that failed to seed and one where everything was invalidated look
the same from every other assertion.
Switching is three acts in a fixed order, and the order is the safety
argument. Ask the server, so a refused switch leaves the browser where it was.
Empty the caches a reload cannot reach, awaited rather than fired, because a
wipe racing the navigation is a wipe that sometimes does not happen. Then
reload the document, which is what discards the in-memory cache, the rendered
React trees, and every request already in flight against the old record.
The banner is the feature, not decoration. Someone who forgets they are
switched will log their own blood pressure into another person's record, and
there is no undo for a reading that was never theirs. So it states whose
record is open, that it is read-only, and carries the way out — in the one
visual register reserved for "something about this screen is not normal", at
the top of the shell above every other strip. A subtle tint is what people
stop seeing on the third switch.
The switcher lives in one component mounted in both user menus. A way in on
the laptop and no way out on the phone is how the two menus have drifted
before.
Nav entries that sharing does not cover drop out, and a page reached by
bookmark says so instead of painting a row of refusals. Both are paint: the
server refuses those routes on its own, from a frozen list this code cannot
reach. Settings, connected services, notifications and the AI surfaces are the
account around a record rather than the record itself.
A grant can end while a browser is inside the record. Revocation clears the
delegate's sessions in the same transaction; expiry does not, and leaves a
session stamped with an account it may no longer act on — correct refusals
under a screen that lies. One cache subscriber notices the stable errorCode
and leaves, rather than asking two hundred call sites to remember.
Marc-André Bombeck