UI geohash notifications (#325)

* location name in notifications

* remove tests

* panic nostr

* mentions with hashes, otherwise none

* fix timestamps

* parse geohashes in messages

* works

* fix country name

* mention notifications work

app/src/main/java/com/bitchat/android/mesh/MessageHandler.kt

@@ -88,12 +88,12 @@ class MessageHandler(private val myPeerID: String) {
                             return
                         }
                         
-                        // Create BitchatMessage - use local system time for incoming messages
+                        // Create BitchatMessage - preserve source packet timestamp
                         val message = BitchatMessage(
                             id = privateMessage.messageID,
                             sender = delegate?.getPeerNickname(peerID) ?: "Unknown",
                             content = privateMessage.content,
-                            timestamp = java.util.Date(), // Use local system time instead of packet timestamp
+                            timestamp = java.util.Date(packet.timestamp.toLong()),
                             isRelay = false,
                             originalSender = null,
                             isPrivate = true,
@@ -343,7 +343,7 @@ class MessageHandler(private val myPeerID: String) {
                 sender = delegate?.getPeerNickname(peerID) ?: "unknown",
                 content = String(packet.payload, Charsets.UTF_8),
                 senderPeerID = peerID,
-                timestamp = Date()
+                timestamp = Date(packet.timestamp.toLong())
             )
 
             delegate?.onMessageReceived(message)
@@ -369,7 +369,7 @@ class MessageHandler(private val myPeerID: String) {
                 sender = delegate?.getPeerNickname(peerID) ?: "unknown",
                 content = String(packet.payload, Charsets.UTF_8),
                 senderPeerID = peerID,
-                timestamp = Date()
+                timestamp = Date(packet.timestamp.toLong())
             )
             delegate?.onMessageReceived(message)
 

app/src/main/java/com/bitchat/android/nostr/NostrGeohashService.kt

@@ -136,6 +136,76 @@ class NostrGeohashService(
         }
     }
 
+    /**
+     * Panic/reset flow for Nostr + geohash systems.
+     * - Disconnect and clear all Nostr relay subscriptions and caches
+     * - Delete device-wide Nostr keys and per-geohash seed cache
+     * - Clear geohash participants, nicknames, message history
+     * - Recreate identity and reconnect; reinitialize subscriptions from scratch
+     */
+    fun panicResetNostrAndGeohash() {
+        coroutineScope.launch {
+            try {
+                val relayManager = NostrRelayManager.getInstance(application)
+
+                // 1) Disconnect from all relays
+                relayManager.disconnect()
+
+                // 2) Clear all subscription tracking and caches
+                relayManager.clearAllSubscriptions()
+
+                // 3) Clear Nostr identity (npub/private) and geohash identity cache/seed
+                try {
+                    NostrIdentityBridge.clearAllAssociations(application)
+                } catch (e: Exception) {
+                    Log.e(TAG, "Failed to clear Nostr associations: ${e.message}")
+                }
+
+                // 4) Clear local geohash state (participants, nicknames, message history)
+                try {
+                    geohashParticipants.clear()
+                    geoNicknames.clear()
+                    geohashMessageHistory.clear()
+                    processedNostrEvents.clear()
+                    processedNostrEventOrder.clear()
+                    currentGeohashSubscriptionId = null
+                    currentGeohashDmSubscriptionId = null
+                    currentGeohash = null
+                    state.setGeohashPeople(emptyList())
+                    state.setTeleportedGeo(emptySet())
+                    state.setGeohashParticipantCounts(emptyMap())
+                    // Stop any timers/jobs
+                    geohashSamplingJob?.cancel()
+                    geohashSamplingJob = null
+                    geoParticipantsTimer?.cancel()
+                    geoParticipantsTimer = null
+                } catch (e: Exception) {
+                    Log.e(TAG, "Failed to clear geohash state: ${e.message}")
+                }
+
+                // 5) Recreate identity and reconnect, then re-subscribe
+                try {
+                    // Touch identity to recreate
+                    val identity = NostrIdentityBridge.getCurrentNostrIdentity(application)
+                    if (identity == null) {
+                        Log.w(TAG, "No identity after reset; skipping subscriptions")
+                        return@launch
+                    }
+
+                    // Reconnect to relays and reinitialize subscriptions
+                    relayManager.connect()
+                    initializeNostrIntegration()
+                    // Re-establish location channel state observers and subscriptions
+                    initializeLocationChannelState()
+                } catch (e: Exception) {
+                    Log.e(TAG, "Failed to reinitialize Nostr after reset: ${e.message}")
+                }
+            } catch (e: Exception) {
+                Log.e(TAG, "panicResetNostrAndGeohash error: ${e.message}")
+            }
+        }
+    }
+    
     /**
      * Initialize location channel state
      */
@@ -610,7 +680,6 @@ class NostrGeohashService(
     private fun storeGeohashMessage(geohash: String, message: BitchatMessage) {
         val messages = geohashMessageHistory.getOrPut(geohash) { mutableListOf() }
         messages.add(message)
-        messages.sortBy { it.timestamp }
         
         // Limit message history to prevent memory issues
         if (messages.size > maxGeohashMessages) {
@@ -1160,11 +1229,12 @@ class NostrGeohashService(
                 return@launch
             }
             
-            val senderName = displayNameForNostrPubkey(event.pubkey)
+            val senderHandle = displayNameForNostrPubkey(event.pubkey)
+            val senderName = displayNameForNostrPubkeyUI(event.pubkey)
             val content = event.content
             
-            // Use local time instead of Nostr event time for consistent message ordering
+            // Preserve Nostr event time to avoid reordering
-            val messageTimestamp = Date()
+            val messageTimestamp = Date(event.createdAt.toLong() * 1000L)
             // Note: mentions parsing needs peer nicknames parameter
             // val mentions = messageManager.parseMentions(content, peerNicknames, nickname)
             
@@ -1174,6 +1244,7 @@ class NostrGeohashService(
                 content = content,
                 timestamp = messageTimestamp,
                 isRelay = false,
+                originalSender = senderHandle,
                 senderPeerID = "nostr:${event.pubkey.take(8)}",
                 mentions = null, // mentions need to be passed from outside
                 channel = "#$geohash"
@@ -1231,12 +1302,32 @@ class NostrGeohashService(
                 Log.d(TAG, "🔔 Triggering geohash notification - geohash: $geohash, mention: $isMention, first: $isFirstMessage")
                 
                 withContext(Dispatchers.Main) {
+                    // Sanitize mention for notifications: hide '#hash' from @username#hash if not needed
+                    val contentForNotification = if (isMention) {
+                        var sanitized = content
+                        try {
+                            val myGeoIdentity = NostrIdentityBridge.deriveIdentity(
+                                forGeohash = geohash,
+                                context = application
+                            )
+                            val myDisplay = displayNameForNostrPubkeyUI(myGeoIdentity.publicKeyHex)
+                            val needsDisambiguation = myDisplay.contains("#")
+                            if (!needsDisambiguation) {
+                                val pattern = ("@" + java.util.regex.Pattern.quote(currentNickname) + "#[a-fA-F0-9]{4}\\b").toRegex()
+                                sanitized = sanitized.replace(pattern, "@" + currentNickname)
+                            }
+                        } catch (_: Exception) { }
+                        sanitized
+                    } else content
+                    
+                    val locationName = getLocationNameForGeohash(geohash)
                     notificationManager.showGeohashNotification(
                         geohash = geohash,
                         senderNickname = senderName,
-                        messageContent = content,
+                        messageContent = contentForNotification,
                         isMention = isMention,
-                        isFirstMessage = isFirstMessage
+                        isFirstMessage = isFirstMessage,
+                        locationName = locationName
                     )
                 }
             }
@@ -1365,7 +1456,8 @@ class NostrGeohashService(
                     }
                     if (messageExists) return@launch
                     
-                    val senderName = displayNameForNostrPubkey(senderPubkey)
+                    val senderHandle = displayNameForNostrPubkey(senderPubkey)
+                    val senderName = displayNameForNostrPubkeyUI(senderPubkey)
                     val isViewingThisChat = state.getSelectedPrivateChatPeerValue() == convKey
                     
                     val message = BitchatMessage(
@@ -1377,6 +1469,7 @@ class NostrGeohashService(
                         isPrivate = true,
                         recipientNickname = state.getNicknameValue(),
                         senderPeerID = convKey,
+                        originalSender = senderHandle,
                         deliveryStatus = com.bitchat.android.model.DeliveryStatus.Delivered(
                             to = state.getNicknameValue() ?: "Unknown",
                             at = Date()
@@ -1454,6 +1547,71 @@ class NostrGeohashService(
         return "anon#$suffix"
     }
 
+    /**
+     * UI display name for Nostr pubkey (conditionally hides #hash when not needed)
+     * Used in chat window sender labels, geohash people list, and notifications.
+     */
+    fun displayNameForNostrPubkeyUI(pubkeyHex: String): String {
+        val pubkeyLower = pubkeyHex.lowercase()
+        val suffix = pubkeyHex.takeLast(4)
+        val currentGeohash = this.currentGeohash
+
+        // Determine base name (self nickname, cached nickname, or anon)
+        val baseName: String = try {
+            if (currentGeohash != null) {
+                val myGeoIdentity = NostrIdentityBridge.deriveIdentity(
+                    forGeohash = currentGeohash,
+                    context = application
+                )
+                if (myGeoIdentity.publicKeyHex.lowercase() == pubkeyLower) {
+                    state.getNicknameValue() ?: "anon"
+                } else {
+                    geoNicknames[pubkeyLower] ?: "anon"
+                }
+            } else {
+                geoNicknames[pubkeyLower] ?: "anon"
+            }
+        } catch (_: Exception) {
+            geoNicknames[pubkeyLower] ?: "anon"
+        }
+
+        // If not in a geohash context, no need for disambiguation
+        if (currentGeohash == null) return baseName
+
+        // Count active participants sharing the same base name within 5 minutes
+        return try {
+            val cutoff = Date(System.currentTimeMillis() - 5 * 60 * 1000)
+            val participants = geohashParticipants[currentGeohash] ?: emptyMap()
+
+            var count = 0
+            for ((participantKey, lastSeen) in participants) {
+                if (lastSeen.before(cutoff)) continue
+                val participantLower = participantKey.lowercase()
+                val name = if (participantLower == pubkeyLower) baseName else (geoNicknames[participantLower] ?: "anon")
+                if (name.equals(baseName, ignoreCase = true)) {
+                    count++
+                    if (count > 1) break
+                }
+            }
+
+            if (!participants.containsKey(pubkeyLower)) {
+                count += 1
+            }
+
+            if (count > 1) "$baseName#$suffix" else baseName
+        } catch (_: Exception) {
+            baseName
+        }
+    }
+
+    /**
+     * Mention handle for a Nostr pubkey (ALWAYS includes #hash)
+     * Use for mentions, hug/slap targets, and mention detection contexts.
+     */
+    fun mentionHandleForNostrPubkey(pubkeyHex: String): String {
+        return displayNameForNostrPubkey(pubkeyHex)
+    }
+    
     // MARK: - Color System
     
     /**
@@ -1606,4 +1764,36 @@ class NostrGeohashService(
         return dataManager.isGeohashUserBlocked(pubkeyHex)
     }
     
+    /**
+     * Get location name for a geohash if available
+     */
+    private fun getLocationNameForGeohash(geohash: String): String? {
+        return try {
+            val locationManager = com.bitchat.android.geohash.LocationChannelManager.getInstance(application)
+            val locationNames = locationManager.locationNames.value ?: return null
+            val available = locationManager.availableChannels.value ?: emptyList()
+            
+            // Determine the level from geohash length
+            val level = when (geohash.length) {
+                in 0..2 -> com.bitchat.android.geohash.GeohashChannelLevel.REGION
+                in 3..4 -> com.bitchat.android.geohash.GeohashChannelLevel.PROVINCE
+                5 -> com.bitchat.android.geohash.GeohashChannelLevel.CITY
+                6 -> com.bitchat.android.geohash.GeohashChannelLevel.NEIGHBORHOOD
+                7 -> com.bitchat.android.geohash.GeohashChannelLevel.BLOCK
+                else -> com.bitchat.android.geohash.GeohashChannelLevel.BLOCK
+            }
+
+            // Only show location name if the notification's geohash matches the device's current geohash at that level
+            val currentAtLevel = available.firstOrNull { it.level == level }?.geohash
+            if (currentAtLevel != null && currentAtLevel.equals(geohash, ignoreCase = true)) {
+                locationNames[level]
+            } else {
+                null
+            }
+        } catch (e: Exception) {
+            Log.w(TAG, "Failed to get location name for geohash $geohash: ${e.message}")
+            null
+        }
+    }
+
 }

app/src/main/java/com/bitchat/android/nostr/NostrRelayManager.kt

@@ -456,6 +456,31 @@ class NostrRelayManager private constructor() {
         }
     }
     
+    /**
+     * Clear all subscription tracking, message handlers, routing caches, and queued messages.
+     * Intended for panic/reset flows prior to reconnecting and re-subscribing from scratch.
+     */
+    fun clearAllSubscriptions() {
+        try {
+            // Clear persistent subscription tracking
+            activeSubscriptions.clear()
+            messageHandlers.clear()
+            subscriptions.clear()
+
+            // Clear routing caches (per-geohash relay selections)
+            geohashToRelays.clear()
+
+            // Clear any queued messages waiting to be sent
+            synchronized(messageQueueLock) {
+                messageQueue.clear()
+            }
+
+            Log.i(TAG, "🧹 Cleared all Nostr subscriptions and routing caches")
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to clear subscriptions: ${e.message}")
+        }
+    }
+    
     /**
      * Get detailed status for all relays
      */

app/src/main/java/com/bitchat/android/onboarding/LocationCheckScreen.kt

@@ -139,7 +139,7 @@ private fun LocationDisabledContent(
                 )
                 
                 Text(
-                    text = "• Bluetooth device scanning (Android requirement)\n" +
+                    text = "• Bluetooth device scanning\n" +
                             "• Discovering nearby users on mesh network\n" +
                             "• Geohash chat feature\n" +
                             "• No tracking or location collection",

app/src/main/java/com/bitchat/android/services/ConversationAliasResolver.kt

@@ -60,7 +60,7 @@ object ConversationAliasResolver {
             }
         }
         if (didMerge) {
-            targetList.sortBy { it.timestamp }
+            // Preserve arrival order; do not sort by timestamp
             currentChats[targetPeerID] = targetList
             state.setPrivateChats(currentChats)
 

app/src/main/java/com/bitchat/android/ui/ChatUIUtils.kt

@@ -5,6 +5,7 @@ import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.SpanStyle
 import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.TextDecoration
 import androidx.compose.ui.unit.sp
 import com.bitchat.android.model.BitchatMessage
 import com.bitchat.android.mesh.BluetoothMeshService
@@ -80,11 +81,11 @@ fun formatMessageAsAnnotatedString(
         builder.append(baseName)
         val nicknameEnd = builder.length
         
-        // Add click annotation for nickname (store full sender name with hash)
+        // Add click annotation for nickname (store canonical sender name with hash if available)
         if (!isSelf) {
             builder.addStringAnnotation(
                 tag = "nickname_click",
-                annotation = message.sender, // Store full sender name with hash
+                annotation = (message.originalSender ?: message.sender),
                 start = nicknameStart,
                 end = nicknameEnd
             )
@@ -258,6 +259,31 @@ private fun appendIOSFormattedContent(
         allMatches.add(match.range to "mention") 
     }
 
+    // Add standalone geohash matches (e.g., "#9q") that are not part of another word
+    // We use MessageSpecialParser to find exact ranges; then merge with existing ranges avoiding overlaps
+    val geoMatches = MessageSpecialParser.findStandaloneGeohashes(content)
+    for (gm in geoMatches) {
+        val range = gm.start until gm.endExclusive
+        if (!overlapsMention(range)) {
+            allMatches.add(range to "geohash")
+        }
+    }
+
+    // Remove generic hashtag matches that overlap with detected geohash ranges to avoid duplicate rendering
+    fun rangesOverlap(a: IntRange, b: IntRange): Boolean {
+        return a.first < b.last && a.last > b.first
+    }
+    val geoRanges = allMatches.filter { it.second == "geohash" }.map { it.first }
+    if (geoRanges.isNotEmpty()) {
+        val iterator = allMatches.listIterator()
+        while (iterator.hasNext()) {
+            val (range, type) = iterator.next()
+            if (type == "hashtag" && geoRanges.any { rangesOverlap(range, it) }) {
+                iterator.remove()
+            }
+        }
+    }
+    
     allMatches.sortBy { it.first.first }
     
     var lastEnd = 0
@@ -327,7 +353,7 @@ private fun appendIOSFormattedContent(
                 }
             }
             "hashtag" -> {
-                // iOS-style: render hashtags like normal content (no special styling)
+                // Render general hashtags like normal content
                 builder.pushStyle(SpanStyle(
                     color = baseColor,
                     fontSize = BASE_FONT_SIZE.sp,
@@ -342,6 +368,37 @@ private fun appendIOSFormattedContent(
                 }
                 builder.pop()
             }
+            else -> {
+                if (type == "geohash") {
+                    // Style geohash in blue, underlined, and add click annotation
+                    builder.pushStyle(SpanStyle(
+                        color = Color(0xFF007AFF),
+                        fontSize = BASE_FONT_SIZE.sp,
+                        fontWeight = if (isSelf) FontWeight.Bold else FontWeight.SemiBold,
+                        textDecoration = TextDecoration.Underline
+                    ))
+                    val start = builder.length
+                    builder.append(matchText)
+                    val end = builder.length
+                    val geohash = matchText.removePrefix("#").lowercase()
+                    builder.addStringAnnotation(
+                        tag = "geohash_click",
+                        annotation = geohash,
+                        start = start,
+                        end = end
+                    )
+                    builder.pop()
+                } else {
+                    // Fallback: treat as normal text
+                    builder.pushStyle(SpanStyle(
+                        color = baseColor,
+                        fontSize = BASE_FONT_SIZE.sp,
+                        fontWeight = if (isSelf) FontWeight.Bold else FontWeight.Normal
+                    ))
+                    builder.append(matchText)
+                    builder.pop()
+                }
+            }
         }
         
         lastEnd = range.last + 1

app/src/main/java/com/bitchat/android/ui/ChatViewModel.kt

@@ -556,8 +556,12 @@ class ChatViewModel(
         // Clear all notifications
         notificationManager.clearAllNotifications()
         
-        // Clear geohash message history
+        // Clear Nostr/geohash state, keys, connections, and reinitialize from scratch
-        nostrGeohashService.clearGeohashMessageHistory()
+        try {
+            nostrGeohashService.panicResetNostrAndGeohash()
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to reset Nostr/geohash: ${e.message}")
+        }
 
         // Reset nickname
         val newNickname = "anon${Random.nextInt(1000, 9999)}"

app/src/main/java/com/bitchat/android/ui/MessageComponents.kt

@@ -21,6 +21,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.hapticfeedback.HapticFeedbackType
 import androidx.compose.ui.platform.LocalHapticFeedback
 import com.bitchat.android.model.BitchatMessage
@@ -199,6 +200,7 @@ private fun MessageTextWithClickableNicknames(
     
     if (!isSelf && (onNicknameClick != null || onMessageLongPress != null)) {
         val haptic = LocalHapticFeedback.current
+        val context = LocalContext.current
         var textLayoutResult by remember { mutableStateOf<TextLayoutResult?>(null) }
         Text(
             text = annotatedText,
@@ -216,6 +218,33 @@ private fun MessageTextWithClickableNicknames(
                             val nickname = nicknameAnnotations.first().item
                             haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)
                             onNicknameClick?.invoke(nickname)
+                            return@detectTapGestures
+                        }
+                        // Handle geohash click to teleport
+                        val geohashAnnotations = annotatedText.getStringAnnotations(
+                            tag = "geohash_click",
+                            start = offset,
+                            end = offset
+                        )
+                        if (geohashAnnotations.isNotEmpty()) {
+                            val geohash = geohashAnnotations.first().item
+                            try {
+                                val locationManager = com.bitchat.android.geohash.LocationChannelManager.getInstance(
+                                    context
+                                )
+                                // Select appropriate precision based on length
+                                val level = when (geohash.length) {
+                                    in 0..2 -> com.bitchat.android.geohash.GeohashChannelLevel.REGION
+                                    in 3..4 -> com.bitchat.android.geohash.GeohashChannelLevel.PROVINCE
+                                    5 -> com.bitchat.android.geohash.GeohashChannelLevel.CITY
+                                    6 -> com.bitchat.android.geohash.GeohashChannelLevel.NEIGHBORHOOD
+                                    else -> com.bitchat.android.geohash.GeohashChannelLevel.BLOCK
+                                }
+                                val channel = com.bitchat.android.geohash.GeohashChannel(level, geohash.lowercase())
+                                locationManager.setTeleported(true)
+                                locationManager.select(com.bitchat.android.geohash.ChannelID.Location(channel))
+                            } catch (_: Exception) { }
+                            haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)
                         }
                     },
                     onLongPress = {

app/src/main/java/com/bitchat/android/ui/MessageManager.kt

@@ -21,7 +21,6 @@ class MessageManager(private val state: ChatState) {
     fun addMessage(message: BitchatMessage) {
         val currentMessages = state.getMessagesValue().toMutableList()
         currentMessages.add(message)
-        currentMessages.sortBy { it.timestamp }
         state.setMessages(currentMessages)
     }
     
@@ -39,7 +38,6 @@ class MessageManager(private val state: ChatState) {
         
         val channelMessageList = currentChannelMessages[channel]?.toMutableList() ?: mutableListOf()
         channelMessageList.add(message)
-        channelMessageList.sortBy { it.timestamp }
         currentChannelMessages[channel] = channelMessageList
         state.setChannelMessages(currentChannelMessages)
         
@@ -83,7 +81,6 @@ class MessageManager(private val state: ChatState) {
         
         val chatMessages = currentPrivateChats[peerID]?.toMutableList() ?: mutableListOf()
         chatMessages.add(message)
-        chatMessages.sortBy { it.timestamp }
         currentPrivateChats[peerID] = chatMessages
         state.setPrivateChats(currentPrivateChats)
         
@@ -103,7 +100,6 @@ class MessageManager(private val state: ChatState) {
         }
         val chatMessages = currentPrivateChats[peerID]?.toMutableList() ?: mutableListOf()
         chatMessages.add(message)
-        chatMessages.sortBy { it.timestamp }
         currentPrivateChats[peerID] = chatMessages
         state.setPrivateChats(currentPrivateChats)
     }

app/src/main/java/com/bitchat/android/ui/MessageSpecialParser.kt

@@ -0,0 +1,53 @@
+package com.bitchat.android.ui
+
+import androidx.compose.ui.text.AnnotatedString
+
+/**
+ * Utilities for parsing special tokens in chat messages (geohashes, etc.).
+ */
+object MessageSpecialParser {
+    // Standalone geohash pattern like "#9q" or longer. Word boundaries enforced.
+    // Geohash alphabet is base32: 0123456789bcdefghjkmnpqrstuvwxyz
+    private val standaloneGeohashRegex = Regex("(^|[^A-Za-z0-9_#])#([0-9bcdefghjkmnpqrstuvwxyz]{2,})($|[^A-Za-z0-9_])", RegexOption.IGNORE_CASE)
+
+    data class GeohashMatch(val start: Int, val endExclusive: Int, val geohash: String)
+
+    /**
+     * Finds standalone geohashes within [text]. A match is returned only when
+     * the '#' token is not part of another word (e.g., not in '@anon#9qk2').
+     */
+    fun findStandaloneGeohashes(text: String): List<GeohashMatch> {
+        if (text.isEmpty()) return emptyList()
+        val matches = mutableListOf<GeohashMatch>()
+        var index = 0
+        while (index < text.length) {
+            val m = standaloneGeohashRegex.find(text, index) ?: break
+            // Adjust to only cover the geohash token starting at '#'
+            val fullRange = m.range
+            // Find the '#' within this match substring
+            val sub = text.substring(fullRange)
+            val hashPos = sub.indexOf('#')
+            if (hashPos >= 0) {
+                val tokenStart = fullRange.first + hashPos
+                // Consume '#' + geohash letters
+                var cursor = tokenStart + 1
+                while (cursor < text.length) {
+                    val ch = text[cursor].lowercaseChar()
+                    val isGeoChar = (ch in '0'..'9') || (ch in "bcdefghjkmnpqrstuvwxyz")
+                    if (!isGeoChar) break
+                    cursor++
+                }
+                val token = text.substring(tokenStart + 1, cursor)
+                if (token.length >= 2) {
+                    matches.add(GeohashMatch(tokenStart, cursor, token.lowercase()))
+                }
+                index = cursor
+            } else {
+                index = fullRange.last + 1
+            }
+        }
+        return matches
+    }
+}
+
+

app/src/main/java/com/bitchat/android/ui/NotificationManager.kt

@@ -82,7 +82,8 @@ class NotificationManager(
         val messageContent: String,
         val timestamp: Long,
         val isMention: Boolean,
-        val isFirstMessage: Boolean
+        val isFirstMessage: Boolean,
+        val locationName: String? = null
     )
 
     init {
@@ -397,7 +398,8 @@ class NotificationManager(
         senderNickname: String,
         messageContent: String,
         isMention: Boolean = false,
-        isFirstMessage: Boolean = false
+        isFirstMessage: Boolean = false,
+        locationName: String? = null
     ) {
         // Only show notifications if app is in background OR user is not viewing this specific geohash
         val shouldNotify = isAppInBackground || (!isAppInBackground && currentGeohash != geohash)
@@ -415,7 +417,8 @@ class NotificationManager(
             messageContent = messageContent,
             timestamp = System.currentTimeMillis(),
             isMention = isMention,
-            isFirstMessage = isFirstMessage
+            isFirstMessage = isFirstMessage,
+            locationName = locationName
         )
 
         // Add to pending notifications for this geohash
@@ -453,12 +456,13 @@ class NotificationManager(
             PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT
         )
 
-        // Build notification content
+        // Build notification content with location name if available
+        val geohashDisplay = latestNotification.locationName?.let { "$it (#$geohash)" } ?: "#$geohash"
         val contentTitle = when {
-            mentionCount > 0 && firstMessageCount > 0 -> "Mentioned in #$geohash (+${messageCount - 1} more)"
+            mentionCount > 0 && firstMessageCount > 0 && messageCount > 1 -> "Mentioned in $geohashDisplay (+${messageCount - 1} more)"
-            mentionCount > 0 -> if (mentionCount == 1) "Mentioned in #$geohash" else "$mentionCount mentions in #$geohash"
+            mentionCount > 0 -> if (mentionCount == 1) "Mentioned in $geohashDisplay" else "$mentionCount mentions in $geohashDisplay"
-            firstMessageCount > 0 -> "New activity in #$geohash"
+            firstMessageCount > 0 -> "New activity in $geohashDisplay"
-            else -> "Messages in #$geohash"
+            else -> "Messages in $geohashDisplay"
         }
 
         val contentText = when {
@@ -564,10 +568,12 @@ class NotificationManager(
         pendingGeohashNotifications.entries.take(5).forEach { (geohash, notifications) ->
             val mentionCount = notifications.count { it.isMention }
             val messageCount = notifications.size
+            val latestNotification = notifications.last()
+            val geohashDisplay = latestNotification.locationName?.let { "$it (#$geohash)" } ?: "#$geohash"
             val line = when {
-                mentionCount > 0 -> "#$geohash: $mentionCount mentions (+${messageCount - mentionCount} more)"
+                mentionCount > 0 -> "$geohashDisplay: $mentionCount mentions (+${messageCount - mentionCount} more)"
-                messageCount == 1 -> "#$geohash: 1 message"
+                messageCount == 1 -> "$geohashDisplay: 1 message"
-                else -> "#$geohash: $messageCount messages"
+                else -> "$geohashDisplay: $messageCount messages"
             }
             style.addLine(line)
         }

app/src/main/java/com/bitchat/android/ui/PrivateChatManager.kt

@@ -501,7 +501,6 @@ class PrivateChatManager(
         }
 
         if (didMerge) {
-            targetList.sortBy { it.timestamp }
             currentChats[targetPeerID] = targetList
             state.setPrivateChats(currentChats)