Debug button (#377)

* feat(debug): add DebugSettingsManager + DebugSettingsSheet scaffold and AboutSheet entry; groundwork for verbose logging, GATT controls, relay stats, device/scan views

* fix(debug): wire debug sheet launch via onShowDebug in AboutSheet from ChatScreen; add public start/stop server/client methods}

* fix(about): remove misplaced debug item block inside PoW section; keep debug launcher managed by ChatScreen only

* feat(debug): wire DebugSettingsSheet role switches to explicit startServer/stopServer and startClient/stopClient; expose role controls + disconnectAll on BluetoothConnectionManager; fix syntax error; build passes

* feat(debug): add connect/disconnect helpers; wire DebugSettingsSheet connect/disconnect actions to BluetoothConnectionManager

* feat(debug): add debug settings button at bottom of AboutSheet; wire onShowDebug callback to open DebugSettingsSheet from ChatScreen

* feat(debug): wire verbose logging into chat view via DebugSettingsManager; add rolling relay stats; push connected devices and scan results; ensure GATT role stop closes connections; log incoming packets and relay events; add UI polling for devices; build passes

* chore(debug-branch): remove unrelated files that were mistakenly added in first commit; keep only intended debug settings changes

* fix(chat): prevent mesh→geohash leak

Root cause:
- DebugSettingsManager→chat bridge appended system logs to the global timeline regardless of active channel
- MeshDelegateHandler added public mesh messages to UI unconditionally

Fixes:
- Only inject debug system messages when selected location channel is Mesh
- Only add public mesh messages to UI when Mesh is selected (still send notifications)

Build: ./gradlew assembleDebug
}

* fix(timeline): restore message persistence across channel switches

Root cause:
- NostrGeohashService.switchLocationChannel() called messageManager.clearMessages()
  which wiped ALL messages (mesh + debug + geohash) from main timeline
- Geohash events were adding to main timeline, causing cross-contamination

Fixes:
- Remove messageManager.clearMessages() from channel switching
- ChatScreen displayMessages now routes to separate storage:
  - Mesh: messages (main timeline, includes debug logs when Mesh selected)
  - Geohash: viewModel.getGeohashMessages(geohash) from separate history
  - Private: privateChats[peerID]
  - Channels: channelMessages[channel]
- Geohash events no longer add to main timeline, only to geohash history
- Mesh messages always stored to preserve history when switching away

Result: Each chat type has persistent separate storage, no message loss

* Debug/relay logs: use MessageType names; include device route in verbose packet logs.

* Verbose device-peer assignment and connection/disconnection logs with peerId, deviceId, nickname; packet relay log uses MessageType names.}

* Debug logs API: include nickname and deviceId for incoming/relay; update callers.}

* Fix compile: import MessageType; correct debug manager API usage and remove stray insertion; build.}

* Respect relay toggle; helper to log relay with deviceId.}

* PacketRelayManager: add relay toggle and unified logging helper; clean file header comments; build fixes.}

* changes

* Geohash local echo: do not add to mesh timeline; rely on geohash history and ChatScreen display for location channels.

* persisting

* persist debug settings

* gitignore

* gatt server / client controls

* debugger

* max connection settings and graph

* more graph

* better logging

* refactor logging

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

@@ -71,11 +71,23 @@ fun ChatScreen(viewModel: ChatViewModel) {
     val isConnected by viewModel.isConnected.observeAsState(false)
     val passwordPromptChannel by viewModel.passwordPromptChannel.observeAsState(null)
 
-    // Determine what messages to show
+    // Get location channel info for timeline switching
+    val selectedLocationChannel by viewModel.selectedLocationChannel.observeAsState()
+
+    // Determine what messages to show based on current context
     val displayMessages = when {
         selectedPrivatePeer != null -> privateChats[selectedPrivatePeer] ?: emptyList()
         currentChannel != null -> channelMessages[currentChannel] ?: emptyList()
-        else -> messages
+        else -> {
+            val locationChannel = selectedLocationChannel
+            if (locationChannel is com.bitchat.android.geohash.ChannelID.Location) {
+                // For geohash channels, get messages from geohash history
+                val geohash = locationChannel.channel.geohash
+                viewModel.getGeohashMessages(geohash)
+            } else {
+                messages // Mesh/public messages
+            }
+        }
     }
 
     // Use WindowInsets to handle keyboard properly
@@ -445,10 +457,19 @@ private fun ChatDialogs(
     )
 
     // About sheet
+    var showDebugSheet by remember { mutableStateOf(false) }
     AboutSheet(
         isPresented = showAppInfo,
-        onDismiss = onAppInfoDismiss
+        onDismiss = onAppInfoDismiss,
+        onShowDebug = { showDebugSheet = true }
     )
+    if (showDebugSheet) {
+        com.bitchat.android.ui.debug.DebugSettingsSheet(
+            isPresented = showDebugSheet,
+            onDismiss = { showDebugSheet = false },
+            meshService = viewModel.meshService
+        )
+    }
     
     // Location channels sheet
     if (showLocationChannelsSheet) {