Feature/nostr embedded bitchat (#448)

* UI: prefer mesh radio icon when connected; map short peer ID to full Noise key; rename ephemeral mapping to shortIDToNoiseKey; ensure header flips to purple globe on disconnect and keeps name.

* chore: stop tracking build artifacts; ignore .DerivedData and .Result*

* logging: add global threshold via BITCHAT_LOG_LEVEL and demote chatty logs to debug; keep critical errors/warnings and key state transitions

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

bitchat/Models/BitchatPeer.swift

@@ -282,16 +282,13 @@ class PeerManager: ObservableObject {
         self.favorites = favorites
         self.mutualFavorites = mutualFavorites
         
-        // Always log favorites debug info when there are favorites
+        // Log peer list summary sparingly at debug level
         if favoritesService.favorites.count > 0 {
             SecureLogger.log("📊 Peer list update: \(allPeers.count) total (\(connectedCount) connected, \(offlineCount) offline), \(favorites.count) favorites, \(mutualFavorites.count) mutual", 
-                            category: SecureLogger.session, level: .info)
-            
-            // Detailed peer status logging removed for brevity
+                            category: SecureLogger.session, level: .debug)
         } else if previousCount != allPeers.count {
-            // Only log non-favorite updates if count changed
             SecureLogger.log("✅ Updated peer list: \(allPeers.count) total peers", 
-                            category: SecureLogger.session, level: .info)
+                            category: SecureLogger.session, level: .debug)
         }
     }
     
@@ -307,4 +304,4 @@ class PeerManager: ObservableObject {
         }
         updatePeers()
     }
-}
+}