feat(notifications): open the subscriptions screen from the ongoing notification

Tapping the always-on notification landed on whatever tab was last open,
which does not answer the question that notification raises. It now
deep-links to Active Relay Subscriptions via an `activesubs` route, and
the screen gets its own entry in All Settings.

The expanded breakdown also held its last value across reconnects. It is
derived from the *connected* relays, so a drop to zero — the "connecting"
state — emptied it and collapsed the expanded view to a single line
exactly when someone was most likely reading it. What each connection is
for does not change while it re-establishes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

amethyst/src/main/java/com/vitorpamplona/amethyst/service/notifications/NotificationRelayService.kt

@@ -36,6 +36,7 @@ import android.os.SystemClock
 import androidx.core.app.NotificationCompat
 import androidx.core.app.ServiceCompat
 import androidx.core.content.ContextCompat
+import androidx.core.net.toUri
 import com.vitorpamplona.amethyst.Amethyst
 import com.vitorpamplona.amethyst.LocalPreferences
 import com.vitorpamplona.amethyst.R
@@ -79,6 +80,10 @@ class NotificationRelayService : Service() {
     companion object {
         private const val TAG = "NotificationRelayService"
         private const val CHANNEL_ID = "notification_relay_service"
+
+        /** Parsed back into `Route.ActiveSubscriptions` by `MainActivity.uriToRoute`. */
+        private const val ACTIVE_SUBSCRIPTIONS_URI = "activesubs"
+
         private const val NOTIFICATION_ID = 9832
 
         private const val ACTION_START = "com.vitorpamplona.amethyst.START_NOTIFICATION_SERVICE"
@@ -141,6 +146,9 @@ class NotificationRelayService : Service() {
     private var relayServiceCollectorJob: Job? = null
     private var connectedRelayCount = 0
 
+    /** Last non-empty per-job breakdown, kept so a reconnect does not blank the expanded view. */
+    private var lastBreakdown: List<String> = emptyList()
+
     override fun onBind(intent: Intent?): IBinder? = null
 
     override fun onCreate() {
@@ -336,9 +344,12 @@ class NotificationRelayService : Service() {
                     pluralStringRes(this, R.plurals.always_on_notif_connected, connectedRelays, connectedRelays)
             }
 
+        // Tapping goes to the screen that answers the question the notification raises — "why is it
+        // connected to N relays" — rather than to whatever tab was last open.
         val openAppIntent =
             Intent(this, MainActivity::class.java).apply {
                 flags = Intent.FLAG_ACTIVITY_SINGLE_TOP
+                data = ACTIVE_SUBSCRIPTIONS_URI.toUri()
             }
         val pendingIntent =
             PendingIntent.getActivity(
@@ -351,8 +362,16 @@ class NotificationRelayService : Service() {
         // Expanded only. The collapsed line stays the bare count it has always been — that is all
         // most people want from an ongoing notification — and the per-job breakdown appears solely
         // when someone deliberately expands it to ask why the phone is talking to N relays.
-        // Skipped entirely when nothing is attributed yet, so we never render an empty section.
-        val breakdown = RelayPurposeSummary.lines(this).takeIf { it.isNotEmpty() }
+        //
+        // Held across reconnects rather than recomputed blindly: the breakdown is derived from the
+        // *connected* relays, so a drop to zero (the "connecting…" state) would otherwise empty it and
+        // the expanded view would collapse to a single line exactly when someone is most likely
+        // looking at it. What each connection is *for* does not change while it is re-establishing,
+        // so the last known answer is still the right one; only the count above it goes stale, and
+        // that count is already labelled "connecting".
+        val fresh = RelayPurposeSummary.lines(this)
+        if (fresh.isNotEmpty()) lastBreakdown = fresh
+        val breakdown = fresh.ifEmpty { lastBreakdown }.takeIf { it.isNotEmpty() }
 
         return NotificationCompat
             .Builder(this, CHANNEL_ID)

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/MainActivity.kt

@@ -203,6 +203,13 @@ fun isWalletConnectRoute(uri: String) = uri.startsWith("dlnwc?value=") || uri.st
 
 fun isMarmotGroupRoute(uri: String) = uri.startsWith("marmot:")
 
+/**
+ * Tapping the always-on service notification. That notification's whole subject is the relay
+ * connections it is holding open, so it lands on the screen that explains them rather than on
+ * whatever tab happened to be last open.
+ */
+fun isActiveSubscriptionsRoute(uri: String) = uri.startsWith("activesubs", true) || uri.startsWith("nostr:activesubs", true)
+
 private val MARMOT_HEX = Regex("^[0-9a-fA-F]+$")
 
 fun uriToRoute(
@@ -213,6 +220,9 @@ fun uriToRoute(
         val scrollTo = runCatching { java.net.URI(uri.removePrefix(NOSTR_URI_PREFIX)).findParameterValue("scrollTo") }.getOrNull()
         return Route.Notification(scrollToEventId = scrollTo)
     }
+    if (isActiveSubscriptionsRoute(uri)) {
+        return Route.ActiveSubscriptions
+    }
     if (isHashtagRoute(uri)) {
         return Route.Hashtag(uri.removePrefix(NOSTR_URI_PREFIX).removePrefix("hashtag?id=").lowercase())
     }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppNavigation.kt

@@ -592,7 +592,7 @@ fun BuildNavigation(
         composableFromEndArgs<Route.UpdateZapAmount> { UpdateZapAmountScreen(accountViewModel, nav, it.nip47) }
         composableFromEndArgs<Route.EditRelays> { AllRelayListScreen(accountViewModel, nav) }
 
-        composableFromEndArgs<Route.ActiveSubscriptions> { ActiveSubscriptionsScreen() }
+        composableFromEndArgs<Route.ActiveSubscriptions> { ActiveSubscriptionsScreen(accountViewModel, nav) }
         composableFromEnd<Route.EventSync> { EventSyncScreen(accountViewModel, nav) }
         composableFromEnd<Route.RequestToVanish> { RequestToVanishScreen(accountViewModel, nav) }
         composableFromEnd<Route.VanishEvents> { VanishEventsScreen(accountViewModel, nav) }

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

@@ -104,6 +104,7 @@ fun buildSettingsCatalog(
                     symEntry(R.string.calendar_reminder_settings_title, MaterialSymbols.CalendarMonth, R.string.calendar_reminder_search_keywords, Route.CalendarReminderSettings),
                     symEntry(R.string.ots_explorer_settings, MaterialSymbols.Search, R.string.ots_explorer_search_keywords, Route.OtsSettings),
                     symEntry(R.string.namecoin_settings, MaterialSymbols.Security, R.string.namecoin_search_keywords, Route.NamecoinSettings),
+                    symEntry(R.string.active_subs_title, MaterialSymbols.CloudSync, R.string.active_subs_search_keywords, Route.ActiveSubscriptions),
                     symEntry(R.string.resource_usage_title, MaterialSymbols.Bolt, R.string.resource_usage_search_keywords, Route.ResourceUsage),
                 ),
         )