feat(cache): add periodic memory cleanup for Desktop

- Add cleanMemory() to DesktopLocalCache (sweeps stale WeakRef entries)
- Add startCleanupLoop() to Coordinator with heap monitoring
  (MemoryMXBean, checks every 30s, cleans at >75% heap or every 5min)
- cleanObservers() clears unused NoteFlowSets on notes + addressables
- Try-catch per operation so one failure doesn't skip the rest
- 2-minute startup grace period before first cleanup
- Cleanup job cancelled on clear() (account switch / logout)

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/Main.kt

@@ -153,7 +153,6 @@ sealed class DesktopScreen {
     ) : DesktopScreen()
 
     data object Drafts : DesktopScreen()
-
     data object Settings : DesktopScreen()
 }
 
@@ -457,7 +456,7 @@ fun App(
                             RelayUrlNormalizer.normalizeOrNull(it)
                         }.toSet(),
                 localCache = localCache,
-            )
+            ).also { it.startCleanupLoop() }
         }
 
     // Clear cache and subscriptions on logout

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/cache/DesktopLocalCache.kt

@@ -515,6 +515,14 @@ class DesktopLocalCache : ICacheProvider {
         followingCounts[pubkey] = count
     }
 
+    // ----- Memory Cleanup -----
+
+    fun cleanMemory() {
+        notes.cleanUp()
+        addressableNotes.cleanUp()
+        users.cleanUp()
+    }
+
     // ----- Stats -----
 
     fun userCount(): Int = users.size()

desktopApp/src/jvmMain/kotlin/com/vitorpamplona/amethyst/desktop/subscriptions/DesktopRelaySubscriptionsCoordinator.kt

@@ -37,11 +37,16 @@ import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
+import java.lang.management.ManagementFactory
 import java.util.concurrent.ConcurrentHashMap
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.seconds
 
 /**
  * Desktop-specific relay subscriptions coordinator.
@@ -356,5 +361,57 @@ class DesktopRelaySubscriptionsCoordinator(
         unsubscribeFromDms()
         feedMetadata.clear()
         rateLimiter.reset()
+        cleanupJob?.cancel()
+    }
+
+    // ----- Memory Cleanup -----
+
+    private val memoryBean = ManagementFactory.getMemoryMXBean()
+    private var lastCleanupTime = 0L
+    private var cleanupJob: Job? = null
+
+    /**
+     * Starts a periodic memory cleanup coroutine.
+     * Checks heap usage every 30s, runs cleanup at >75% heap or every 5 minutes.
+     */
+    fun startCleanupLoop() {
+        cleanupJob =
+            scope.launch(Dispatchers.Default) {
+                delay(2.minutes)
+                while (isActive) {
+                    delay(30.seconds)
+                    val heapPct = heapUsagePercent()
+                    val elapsed = System.currentTimeMillis() - lastCleanupTime
+                    if (heapPct > 0.75 || elapsed > 5.minutes.inWholeMilliseconds) {
+                        runCleanup()
+                    }
+                }
+            }
+    }
+
+    private suspend fun runCleanup() {
+        val ops =
+            listOf<Pair<String, suspend () -> Unit>>(
+                "cleanMemory" to { localCache.cleanMemory() },
+                "cleanObservers" to { cleanObservers() },
+            )
+        ops.forEach { (name, op) ->
+            try {
+                op()
+            } catch (e: Exception) {
+                println("Cleanup $name failed: ${e.message}")
+            }
+        }
+        lastCleanupTime = System.currentTimeMillis()
+    }
+
+    private fun cleanObservers() {
+        localCache.notes.forEach { _, note -> note.clearFlow() }
+        localCache.addressableNotes.forEach { _, note -> note.clearFlow() }
+    }
+
+    private fun heapUsagePercent(): Double {
+        val heap = memoryBean.heapMemoryUsage
+        return heap.used.toDouble() / heap.max.toDouble()
     }
 }

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

@@ -45,7 +45,6 @@ import com.vitorpamplona.amethyst.desktop.chess.ChessScreen
 import com.vitorpamplona.amethyst.desktop.model.DesktopIAccount
 import com.vitorpamplona.amethyst.desktop.network.DesktopRelayConnectionManager
 import com.vitorpamplona.amethyst.desktop.service.drafts.DesktopDraftStore
-import com.vitorpamplona.amethyst.desktop.service.highlights.DesktopHighlightStore
 import com.vitorpamplona.amethyst.desktop.subscriptions.DesktopRelaySubscriptionsCoordinator
 import com.vitorpamplona.amethyst.desktop.subscriptions.FeedMode
 import com.vitorpamplona.amethyst.desktop.ui.ArticleEditorScreen
@@ -97,8 +96,6 @@ fun DeckColumnContainer(
     iAccount: DesktopIAccount,
     nwcConnection: Nip47URINorm?,
     subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
-    highlightStore: DesktopHighlightStore,
-    draftStore: DesktopDraftStore,
     appScope: CoroutineScope,
     onShowComposeDialog: () -> Unit,
     onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
@@ -139,8 +136,6 @@ fun DeckColumnContainer(
                 iAccount = iAccount,
                 nwcConnection = nwcConnection,
                 subscriptionsCoordinator = subscriptionsCoordinator,
-                highlightStore = highlightStore,
-                draftStore = draftStore,
                 appScope = appScope,
                 compactMode = true,
                 onShowComposeDialog = onShowComposeDialog,
@@ -149,7 +144,6 @@ fun DeckColumnContainer(
                 onNavigateToProfile = { navState.push(DesktopScreen.UserProfile(it)) },
                 onNavigateToThread = { navState.push(DesktopScreen.Thread(it)) },
                 onNavigateToArticle = { navState.push(DesktopScreen.Article(it)) },
-                onNavigateToEditor = { navState.push(DesktopScreen.Editor(it)) },
             )
             if (currentOverlay != null) {
                 Surface(
@@ -163,14 +157,11 @@ fun DeckColumnContainer(
                         account = account,
                         nwcConnection = nwcConnection,
                         subscriptionsCoordinator = subscriptionsCoordinator,
-                        highlightStore = highlightStore,
-                        draftStore = draftStore,
                         onShowComposeDialog = onShowComposeDialog,
                         onShowReplyDialog = onShowReplyDialog,
                         onZapFeedback = onZapFeedback,
                         onNavigateToProfile = { navState.push(DesktopScreen.UserProfile(it)) },
                         onNavigateToThread = { navState.push(DesktopScreen.Thread(it)) },
-                        onNavigateToArticle = { navState.push(DesktopScreen.Article(it)) },
                         onBack = { navState.pop() },
                     )
                 }
@@ -189,8 +180,6 @@ internal fun RootContent(
     iAccount: DesktopIAccount,
     nwcConnection: Nip47URINorm?,
     subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
-    highlightStore: DesktopHighlightStore? = null,
-    draftStore: DesktopDraftStore? = null,
     appScope: CoroutineScope,
     compactMode: Boolean = false,
     onShowComposeDialog: () -> Unit,
@@ -199,7 +188,6 @@ internal fun RootContent(
     onNavigateToProfile: (String) -> Unit,
     onNavigateToThread: (String) -> Unit,
     onNavigateToArticle: (String) -> Unit = {},
-    onNavigateToEditor: (String?) -> Unit = {},
 ) {
     val scope = rememberCoroutineScope()
 
@@ -249,11 +237,8 @@ internal fun RootContent(
                 relayManager = relayManager,
                 localCache = localCache,
                 account = account,
-                nwcConnection = nwcConnection,
                 onNavigateToProfile = onNavigateToProfile,
                 onNavigateToArticle = onNavigateToArticle,
-                onNavigateToThread = onNavigateToThread,
-                onZapFeedback = onZapFeedback,
             )
         }
 
@@ -296,7 +281,6 @@ internal fun RootContent(
                 onBack = {},
                 onCompose = onShowComposeDialog,
                 onNavigateToProfile = onNavigateToProfile,
-                onNavigateToArticle = onNavigateToArticle,
                 onZapFeedback = onZapFeedback,
             )
         }
@@ -352,16 +336,16 @@ internal fun RootContent(
                 localCache = localCache,
                 account = account,
                 subscriptionsCoordinator = subscriptionsCoordinator,
-                highlightStore = highlightStore,
                 onBack = {},
                 onNavigateToProfile = onNavigateToProfile,
             )
         }
 
-        is DeckColumnType.Editor -> {
+        DeckColumnType.Editor -> {
+            val draftStore = remember { DesktopDraftStore(scope) }
             ArticleEditorScreen(
-                draftSlug = columnType.draftSlug,
+                draftSlug = null,
-                draftStore = draftStore ?: remember { DesktopDraftStore(scope) },
+                draftStore = draftStore,
                 account = account,
                 relayManager = relayManager,
                 onBack = {},
@@ -370,16 +354,10 @@ internal fun RootContent(
         }
 
         DeckColumnType.Drafts -> {
+            val draftStore = remember { DesktopDraftStore(scope) }
             DraftsScreen(
-                draftStore = draftStore ?: remember { DesktopDraftStore(scope) },
+                draftStore = draftStore,
-                onOpenEditor = { slug -> onNavigateToEditor(slug) },
+                onOpenEditor = {},
-            )
-        }
-
-        DeckColumnType.MyHighlights -> {
-            com.vitorpamplona.amethyst.desktop.ui.highlights.MyHighlightsScreen(
-                highlightStore = highlightStore ?: remember { DesktopHighlightStore(scope) },
-                onNavigateToArticle = onNavigateToArticle,
             )
         }
 
@@ -404,14 +382,11 @@ internal fun OverlayContent(
     account: AccountState.LoggedIn,
     nwcConnection: Nip47URINorm?,
     subscriptionsCoordinator: DesktopRelaySubscriptionsCoordinator,
-    highlightStore: DesktopHighlightStore? = null,
-    draftStore: DesktopDraftStore? = null,
     onShowComposeDialog: () -> Unit,
     onShowReplyDialog: (com.vitorpamplona.quartz.nip01Core.core.Event) -> Unit,
     onZapFeedback: (ZapFeedback) -> Unit,
     onNavigateToProfile: (String) -> Unit,
     onNavigateToThread: (String) -> Unit,
-    onNavigateToArticle: (String) -> Unit = {},
     onBack: () -> Unit,
 ) {
     when (screen) {
@@ -426,7 +401,6 @@ internal fun OverlayContent(
                 onBack = onBack,
                 onCompose = onShowComposeDialog,
                 onNavigateToProfile = onNavigateToProfile,
-                onNavigateToArticle = onNavigateToArticle,
                 onZapFeedback = onZapFeedback,
             )
         }
@@ -454,24 +428,11 @@ internal fun OverlayContent(
                 localCache = localCache,
                 account = account,
                 subscriptionsCoordinator = subscriptionsCoordinator,
-                highlightStore = highlightStore,
                 onBack = onBack,
                 onNavigateToProfile = onNavigateToProfile,
             )
         }
 
-        is DesktopScreen.Editor -> {
-            val overlayScope = androidx.compose.runtime.rememberCoroutineScope()
-            ArticleEditorScreen(
-                draftSlug = screen.draftSlug,
-                draftStore = draftStore ?: remember { DesktopDraftStore(overlayScope) },
-                account = account,
-                relayManager = relayManager,
-                onBack = onBack,
-                onPublished = onBack,
-            )
-        }
-
         else -> {
             androidx.compose.material3.Text(
                 "Unsupported screen type",