feat: resolve useTime() thunk() error (#24234)

Fixes a regression introduced in #24060 that could crash the frontend.

`thunk` is created by `useEffectEvent()`, and React 19.2 enforces that
effect-event functions are not invoked during render. The previous code
called `thunk()` inside a `setState` updater function, and React
executes updater
functions during render, so this became an illegal render-phase call.

The fix computes `next` in the interval callback (`const next =
thunk()`) and then stores it via `setComputedValue(() => next)`. This
keeps the `useEffectEvent` call outside render and also preserves
correct behavior when `func` returns a function value, because React
stores `next` instead of treating it as a functional updater.

site/src/hooks/useTime.ts

@@ -30,7 +30,8 @@ export function useTime<T>(func: () => T, options: UseTimeOptions = {}): T {
 		}
 
 		const handle = setInterval(() => {
-			setComputedValue(() => thunk());
+			const next = thunk();
+			setComputedValue(() => next);
 		}, interval);
 
 		return () => {