fix(home): clear Home dot when any one home tab is read to the top

The previous attempt lit the dot whenever *any* enabled home tab had unread
items, so a user with all three tabs enabled who only scrolled through the
Everything tab still saw the dot — HomeFollows / HomeFollowsReplies stayed at
their old lastRead even though the same content had been read via Everything.

Switch to "every enabled tab still has unread" — equivalently, reaching the
top of any single enabled tab clears the dot. This matches the pre-bug
behavior (where only the New Threads tab gated the dot) while still respecting
users who only enable the Everything tab.

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/AccountViewModel.kt

@@ -438,9 +438,11 @@ class AccountViewModel(
                 // HomeScreen falls back to the New Threads tab when the user disables every tab.
                 threadsHas
             } else {
-                (showThreads && threadsHas) ||
-                    (showReplies && repliesHas) ||
-                    (showEverything && everythingHas)
+                // Dot stays lit only when every enabled tab still has unread items.
+                // Reaching the top of any single tab marks its newest item read and clears the dot.
+                (!showThreads || threadsHas) &&
+                    (!showReplies || repliesHas) &&
+                    (!showEverything || everythingHas)
             }
         }