Reduce polling (#2465)

* Move profile and preference polling to polls-on-foreground

* Refetch prefs on feeds screen refresh since polling no longer occurs

* Reduce notifications polling by 50% if there's already an unread

* Disable feed polling if we know we have content

* Disable the hard refresh after 1 hour in case it's the cause of the random feed refresh bug

* Fix types

src/view/com/feeds/FeedPage.tsx

@@ -174,6 +174,7 @@ export function FeedPage({
           feed={feed}
           feedParams={feedParams}
           pollInterval={POLL_FREQ}
+          disablePoll={hasNew}
           scrollElRef={scrollElRef}
           onScrolledDownChange={setIsScrolledDown}
           onHasNew={setHasNew}