Seven of the eight comments, plus the three suppressed ones (the same
double-cast class):
- Narrow the toast hooks to `InspectorClientEventSource`, the client's
typed event-listener surface. A bare `EventTarget` cannot satisfy it
(its listener takes an `Event`, the typed one a `TypedEventGeneric`
with `detail`), so both tests now construct a real
`InspectorClientEventTarget` and dispatch through `dispatchTypedEvent`
rather than casting a stand-in. That failed to compile immediately and
caught two bad fixtures: `task()` was a `Pick<Task, "status">` where
the event map wants a full `Task`, and `toolCallTaskUpdated` was
dispatched with no `task` at all.
- Narrow `useExportActions`'s three store parameters to the single
clearing method each handler calls, so the test doubles are
structurally checked instead of cast away.
- Build real `MessageEntry` fixtures (`timestamp` is a `Date`, not `0`),
removing four more double casts.
- Fix a tautological assertion in useTabUiState.test: it compared a
callback to itself, so it held however the identity changed. Every
callback is now captured before the update and compared to those
references.
- Reword `resetTabUiState`'s doc: `exhaustive-deps` cannot infer
stability across a hook boundary, so the dependency IS named — the
stability buys no churn, not omission.
- Justify the one remaining double cast in place, per the type-safety
rule.
`useProgressToasts` still returns `void` rather than an object,
deliberately: it has nothing to return, and `{}` would imply an API that
is not there. Noted on the PR as the one deviation from #2128's
"returns one object" criterion.
Signed-off-by: cliffhall <cliff@futurescale.com>