perf(ui): drop remember wrappers where overhead exceeds savings

Cases removed:
- Trivial Modifier allocations (Modifier.weight/padding/size) — slot table
  cost dominates the cost of building a fresh Modifier each recomposition.
- Map.keys views over relayStatuses on desktop screens — .keys is a
  property read on the same map, no need to memoize.
- coerceIn() arithmetic on AudioWaveform Dp/Float params — two compares
  are cheaper than the slot table read+compare.
- fadeIn()/fadeOut() in AnimatedVisibility — small EnterTransition
  allocations that don't justify the slot table overhead.

Audit-only changes; no behavior changes.

https://claude.ai/code/session_011Ea2pVjwvCEx7X4izwryV4

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/BookmarksScreen.kt

@@ -79,7 +79,7 @@ fun BookmarksScreen(
     onZapFeedback: (ZapFeedback) -> Unit = {},
 ) {
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val connectedRelays = remember(relayStatuses) { relayStatuses.keys }
+    val connectedRelays = relayStatuses.keys
     val scope = rememberCoroutineScope()
 
     // Tab state

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/FeedScreen.kt

@@ -280,7 +280,7 @@ fun FeedScreen(
     val followedUsers by localCache.followedUsers.collectAsState()
 
     // Available relay URLs — subscribe triggers connection on-demand
-    val allRelayUrls = remember(relayStatuses) { relayStatuses.keys }
+    val allRelayUrls = relayStatuses.keys
 
     // Feed relays from relay categories (NIP-65 outbox, minus blocked, with fallback)
     val relayCategories = LocalRelayCategories.current

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/NotificationsScreen.kt

@@ -115,7 +115,7 @@ fun NotificationsScreen(
     subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator? = null,
 ) {
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val connectedRelays = remember(relayStatuses) { relayStatuses.keys }
+    val connectedRelays = relayStatuses.keys
     val scope = rememberCoroutineScope()
     val notificationState =
         remember {

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/ReadsScreen.kt

@@ -183,7 +183,7 @@ fun ReadsScreen(
     onZapFeedback: (ZapFeedback) -> Unit = {},
 ) {
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val connectedRelays = remember(relayStatuses) { relayStatuses.keys }
+    val connectedRelays = relayStatuses.keys
     val scope = rememberCoroutineScope()
 
     val eventState =

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/SearchScreen.kt

@@ -130,7 +130,7 @@ fun SearchScreen(
 
     val connectedRelays by relayManager.connectedRelays.collectAsState()
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val allRelayUrls = remember(relayStatuses) { relayStatuses.keys }
+    val allRelayUrls = relayStatuses.keys
     val relayCategories = LocalRelayCategories.current
     val searchRelays by relayCategories.searchRelays.collectAsState()
     val displayText by state.displayText.collectAsState()

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/ThreadScreen.kt

@@ -90,7 +90,7 @@ fun ThreadScreen(
     onReply: (Event) -> Unit = {},
 ) {
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val connectedRelays = remember(relayStatuses) { relayStatuses.keys }
+    val connectedRelays = relayStatuses.keys
 
     // Lightbox state
     var lightboxState by remember { mutableStateOf<LightboxState?>(null) }

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/UserProfileScreen.kt

@@ -122,7 +122,7 @@ fun UserProfileScreen(
     onZapFeedback: (ZapFeedback) -> Unit = {},
 ) {
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val connectedRelays = remember(relayStatuses) { relayStatuses.keys }
+    val connectedRelays = relayStatuses.keys
 
     // User metadata — seed from cache so returning to profile is instant
     val cachedUser = remember(pubKeyHex) { localCache.getUserIfExists(pubKeyHex) }

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/ui/chats/NewDmDialog.kt

@@ -78,7 +78,7 @@ fun NewDmDialog(
     val relaySearchResults by searchState.relaySearchResults.collectAsState()
     val isSearchingRelays by searchState.isSearchingRelays.collectAsState()
     val relayStatuses by relayManager.relayStatuses.collectAsState()
-    val connectedRelays = remember(relayStatuses) { relayStatuses.keys }
+    val connectedRelays = relayStatuses.keys
     val focusRequester = remember { FocusRequester() }
 
     // NIP-50 relay search when local cache has few/no results