Implement favorites, notifications, and improve fragment handling

- Add favorites functionality for peers with persistent storage
  - Star icon to toggle favorites in sidebar
  - Favorites appear at top of peer list
  - Storage persists across app launches using peer ID

- Add local notifications for mentions and private messages
  - Notifications appear when app is in background
  - Separate notification types for mentions vs private messages
  - Request notification permissions on app launch

- Fix sidebar header alignment to match main toolbar (44pt)
  - Add background color to sidebar header for visual consistency

- Improve voice note fragment transmission
  - Send fragments in batches of 5 with delays to prevent congestion
  - Better logging to debug fragment transmission issues
  - Reduce delay between fragments from 50ms to batch-based timing

- Fix other UI issues
  - Ensure mic recording ripples originate from mic button
  - Update sidebar to swipe from right edge smoothly

project.yml

@@ -9,7 +9,7 @@ options:
 settings:
   MARKETING_VERSION: 1.0.0
   CURRENT_PROJECT_VERSION: 1
-  DEVELOPMENT_TEAM: ""
+  DEVELOPMENT_TEAM: "L3N5LHJD5Y"
   
 targets:
   bitchat:
@@ -46,5 +46,7 @@ targets:
       MACOSX_DEPLOYMENT_TARGET: 13.0
       SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD: YES
       CODE_SIGN_STYLE: Automatic
+      CODE_SIGNING_REQUIRED: YES
+      CODE_SIGNING_ALLOWED: YES
       ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
       ASSETCATALOG_COMPILER_INCLUDE_ALL_APPICON_ASSETS: YES