Refactor/robustness (#446)

* Refactor BitChat for improved robustness and performance

Major refactoring to simplify architecture and fix critical issues:

Architecture Improvements:
- Replace complex BluetoothMeshService with simplified SimplifiedBluetoothService
- Consolidate message routing and peer management into unified services
- Remove redundant caching layers and optimize performance

Bug Fixes:
- Fix critical BLE peer mapping corruption in mesh networks
- Fix encrypted message routing failures in multi-peer scenarios
- Fix app freezes and Main Thread Checker warnings
- Fix BLE message delivery in dual-role connections
- Fix favorite toggle UI not updating instantly
- Fix Nostr offline messaging with 24-hour message filtering

Features:
- Add command processor for chat commands
- Add autocomplete service for mentions and commands
- Improve private chat management with dedicated service
- Add unified peer service for consistent state management

Performance:
- Optimize BLE reconnection speed
- Reduce excessive logging throughout codebase
- Improve message deduplication efficiency
- Optimize UI updates and state management

* Improvements refactor robust (#441)

* remove unused code

* remove more

* TLV for announcement

* restore

* restore

* restore?

* messages tlv too (#442)

* Fix Nostr notification and read receipt issues, add TLV encoding, cleanup unused code

## Notification & Read Receipt Fixes
- Fixed toolbar notification icon appearing incorrectly on app restart for already-read messages
- Fixed read receipts being incorrectly deleted on startup when privateChats was empty
- Fixed messages not being marked as read when opening chat for first time
- Fixed senderPeerID not being updated during message consolidation
- Added startup phase logic to block old messages (>30s) while allowing recent ones
- Fixed unread status checking across all storage locations (ephemeral, stable Noise keys, temporary Nostr IDs)

## TLV Encoding Implementation
- Implemented Type-Length-Value encoding for private message payloads
- Added PrivateMessagePacket struct with TLV encode/decode methods
- Enhanced message structure for better extensibility and robustness

## Code Cleanup
- Removed unused PeerStateManager class and related dependencies
- Removed dead protocol types (DeliveryAck, ProtocolAck/Nack, NoiseIdentityAnnouncement)
- Cleaned up BitchatDelegate by removing unused methods
- Removed excessive debug logging throughout ChatViewModel
- Added test-only ProtocolNack helper for integration tests

## Technical Details
- Messages stored under three ID types: ephemeral peer IDs, stable Noise key hexes, temporary Nostr IDs
- Fixed cleanupOldReadReceipts() to skip when privateChats is empty or during startup
- Updated message consolidation to properly update senderPeerID
- Restored NIP-17 timestamp randomization (±15 minutes) for privacy

---------

Co-authored-by: jack <jackjackbits@users.noreply.github.com>
Co-authored-by: callebtc <93376500+callebtc@users.noreply.github.com>

AI_CONTEXT.md

@@ -47,14 +47,14 @@ BitChat is a decentralized, peer-to-peer messaging application that works over B
                     │
 ┌─────────────────────────────────────────────────────────────────┐
 │                   Bluetooth Transport Layer                       │
-│                   (BluetoothMeshService)                          │
+│                  (SimplifiedBluetoothService)                     │
 └─────────────────────────────────────────────────────────────────┘
 ```
 
 ## Core Components
 
-### 1. BluetoothMeshService (Transport Layer)
-- **Location**: `bitchat/Services/BluetoothMeshService.swift`
+### 1. SimplifiedBluetoothService (Transport Layer)
+- **Location**: `bitchat/Services/SimplifiedBluetoothService.swift`
 - **Purpose**: Manages BLE connections and implements mesh networking
 - **Key Responsibilities**:
   - Peer discovery (scanning and advertising simultaneously)
@@ -159,7 +159,7 @@ BitChat is a decentralized, peer-to-peer messaging application that works over B
 
 ### Services (`/bitchat/Services/`)
 Application-level services that coordinate between layers:
-- `BluetoothMeshService`: Core networking
+- `SimplifiedBluetoothService`: Core networking
 - `NoiseEncryptionService`: Encryption coordination
 - `MessageRetryService`: Reliability layer
 - `DeliveryTracker`: Acknowledgment handling
@@ -368,7 +368,7 @@ Structured content for different message types:
 5. Update help text
 
 ### Debugging Bluetooth Issues
-1. Check `BluetoothMeshService` logs
+1. Check `SimplifiedBluetoothService` logs
 2. Verify peer states and connections
 3. Monitor characteristic updates
 4. Use Bluetooth debugging tools