Mesh robustness optimizations (#463)

* Mesh robustness: link-aware fragmentation, relay jitter, connection budget, adaptive scanning; fix BLE queue deadlock

- Link-aware fragmentation using per-link write/notify limits
- Directed fragments for one-to-one; exclude from relays
- Add relay jitter with cancel-on-duplicate to reduce floods
- Cap central links and rate-limit connect attempts with queue
- Foreground duty-cycled scanning when connected; continuous when isolated
- Fix deadlock by avoiding sync on BLE queue when already on it
- Silence Keychain var->let warnings

* Mesh: add relay jitter; dynamic RSSI threshold; candidate scoring/backoff; fix misplaced lines in BLEService extension

* macOS UI: restore mesh peer list when geohash feature is iOS-only by moving mesh list outside iOS switch (ContentView)

* ContentView: add macOS mesh peer list under #else to fix missing People section on macOS

* Refactor People section: extract MeshPeerList and GeohashPeopleList into separate views to reduce SwiftUI type-checking complexity; integrate in ContentView

* BLE: prevent re-fragmentation loops; UI: darker mesh blue + first-row spacing in peer list

* Mesh flood/battery: probabilistic relays, adaptive TTL caps, fragment pacing + scan pause, assembly cap; enable relayed DMs with direct-first then flood fallback.

* Refactor BLEService broadcast: split pad policy, encrypted/direct-first handler, and link-aware sender; simplify broadcastPacket to delegate by type.

* Extract relay decision into RelayController with RelayDecision; simplify handleReceivedPacket to use it.

* Move RelayController and RelayDecision into their own file under Services; keep BLEService leaner.

* UI: adjust mesh blue to a darker, less purple tone; apply consistently for count and #mesh badge.

* Project: include RelayController.swift in target and sync project file changes.

---------

Co-authored-by: jack <[email protected]>

Author: jackjackbits

bitchat.xcodeproj/project.pbxproj

@@ -23,6 +23,12 @@
 		047502AD2E55E8360083520F /* BinaryProtocolPaddingTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502AB2E55E8360083520F /* BinaryProtocolPaddingTests.swift */; };
 		047502B02E55E8450083520F /* InputValidatorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502AE2E55E8450083520F /* InputValidatorTests.swift */; };
 		047502B12E55E8450083520F /* InputValidatorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502AE2E55E8450083520F /* InputValidatorTests.swift */; };
+		047502B42E55FED60083520F /* MeshPeerList.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502B32E55FED60083520F /* MeshPeerList.swift */; };
+		047502B52E55FED60083520F /* GeohashPeopleList.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502B22E55FED60083520F /* GeohashPeopleList.swift */; };
+		047502B62E55FED60083520F /* MeshPeerList.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502B32E55FED60083520F /* MeshPeerList.swift */; };
+		047502B72E55FED60083520F /* GeohashPeopleList.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502B22E55FED60083520F /* GeohashPeopleList.swift */; };
+		047502B92E560F690083520F /* RelayController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502B82E560F690083520F /* RelayController.swift */; };
+		047502BA2E560F690083520F /* RelayController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 047502B82E560F690083520F /* RelayController.swift */; };
 		049BD3902E4EC4F0001A566B /* PrivateChatManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD38F2E4EC4F0001A566B /* PrivateChatManager.swift */; };
 		049BD3912E4EC4F0001A566B /* AutocompleteService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD38C2E4EC4F0001A566B /* AutocompleteService.swift */; };
 		049BD3922E4EC4F0001A566B /* CommandProcessor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 049BD38D2E4EC4F0001A566B /* CommandProcessor.swift */; };
@@ -180,6 +186,9 @@
 		047502912E547ACC0083520F /* LocationChannelsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LocationChannelsTests.swift; sourceTree = "<group>"; };
 		047502AB2E55E8360083520F /* BinaryProtocolPaddingTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BinaryProtocolPaddingTests.swift; sourceTree = "<group>"; };
 		047502AE2E55E8450083520F /* InputValidatorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = InputValidatorTests.swift; sourceTree = "<group>"; };
+		047502B22E55FED60083520F /* GeohashPeopleList.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GeohashPeopleList.swift; sourceTree = "<group>"; };
+		047502B32E55FED60083520F /* MeshPeerList.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MeshPeerList.swift; sourceTree = "<group>"; };
+		047502B82E560F690083520F /* RelayController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RelayController.swift; sourceTree = "<group>"; };
 		049BD38C2E4EC4F0001A566B /* AutocompleteService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AutocompleteService.swift; sourceTree = "<group>"; };
 		049BD38D2E4EC4F0001A566B /* CommandProcessor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CommandProcessor.swift; sourceTree = "<group>"; };
 		049BD38F2E4EC4F0001A566B /* PrivateChatManager.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PrivateChatManager.swift; sourceTree = "<group>"; };
@@ -412,6 +421,8 @@
 		A55126E93155456CAA8D6656 /* Views */ = {
 			isa = PBXGroup;
 			children = (
+				047502B22E55FED60083520F /* GeohashPeopleList.swift */,
+				047502B32E55FED60083520F /* MeshPeerList.swift */,
 				0475028E2E5417660083520F /* LocationChannelsSheet.swift */,
 				763E0DBA9492A654FC0CDCB9 /* AppInfoView.swift */,
 				A08E03AA0C63E97C91749AEC /* ContentView.swift */,
@@ -483,6 +494,7 @@
 		D98A3186D7E4C72E35BDF7FE /* Services */ = {
 			isa = PBXGroup;
 			children = (
+				047502B82E560F690083520F /* RelayController.swift */,
 				0475028B2E54171C0083520F /* LocationChannelManager.swift */,
 				049BD3B02E51F319001A566B /* MessageRouter.swift */,
 				049BD3B12E51F319001A566B /* NostrTransport.swift */,
@@ -703,13 +715,16 @@
 				049BD3B42E51F319001A566B /* NostrTransport.swift in Sources */,
 				049BD3B52E51F319001A566B /* MessageRouter.swift in Sources */,
 				4B747085D07A1BCE0F5BA612 /* BinaryProtocol.swift in Sources */,
+				047502B92E560F690083520F /* RelayController.swift in Sources */,
 				6E7761E21C99F28AE2F9BE5F /* BitchatApp.swift in Sources */,
 				84E3F9B64FB7FB4A140BD0A8 /* BitchatPeer.swift in Sources */,
 				923027D6F2F417AFA2488127 /* BitchatProtocol.swift in Sources */,
 				D450CF41F207BDE1A1AAA56E /* ChatViewModel.swift in Sources */,
 				B0CA7796B2B2AC2B33F84548 /* CompressionUtil.swift in Sources */,
 				92D34E7A07C990C8A815B0CE /* ContentView.swift in Sources */,
 				5C93B4FDD0C448C3EDDBF8AE /* FavoritesPersistenceService.swift in Sources */,
+				047502B42E55FED60083520F /* MeshPeerList.swift in Sources */,
+				047502B52E55FED60083520F /* GeohashPeopleList.swift in Sources */,
 				6C63FA98D59854C15C57B3D6 /* FingerprintView.swift in Sources */,
 				38EDDC049FD56B1BB1F14C91 /* IdentityModels.swift in Sources */,
 				7241FFD6CFFB875B864FA223 /* InputValidator.swift in Sources */,
@@ -753,13 +768,16 @@
 				049BD3B22E51F319001A566B /* NostrTransport.swift in Sources */,
 				049BD3B32E51F319001A566B /* MessageRouter.swift in Sources */,
 				F455F011B3B648ADA233F998 /* BinaryProtocol.swift in Sources */,
+				047502BA2E560F690083520F /* RelayController.swift in Sources */,
 				10E68BB889356219189E38EC /* BitchatApp.swift in Sources */,
 				84D13329AB7EE1D65A37438A /* BitchatPeer.swift in Sources */,
 				6DE056E1EE9850E9FBF50157 /* BitchatProtocol.swift in Sources */,
 				7576A357B278E5733E9D9F33 /* ChatViewModel.swift in Sources */,
 				7DCA0DBCB8884E3B31C7BCE3 /* CompressionUtil.swift in Sources */,
 				1D9674FA5F998503831DC281 /* ContentView.swift in Sources */,
 				ACE2ED172C37F01561E50B71 /* FavoritesPersistenceService.swift in Sources */,
+				047502B62E55FED60083520F /* MeshPeerList.swift in Sources */,
+				047502B72E55FED60083520F /* GeohashPeopleList.swift in Sources */,
 				132DF1E24B4E9C7DCDAD4376 /* FingerprintView.swift in Sources */,
 				B909706CD38FC56C0C8EB7BF /* IdentityModels.swift in Sources */,
 				EF49C600C1E464710DD6CA29 /* InputValidator.swift in Sources */,

bitchat/Protocols/LocationChannel.swift

@@ -25,7 +25,7 @@ enum GeohashChannelLevel: CaseIterable, Codable, Equatable {
         switch self {
         case .street: return "Street"
         case .block: return "Block"
-        case .neighborhood: return "'hood"
+        case .neighborhood: return "Neighborhood"
         case .city: return "City"
         case .region: return "Region"
         case .country: return "Country"