feat: Add support for hash and private channels with corresponding UI updates

- Introduced new localization strings for channel types and their descriptions in Italian, German, Spanish, French, Croatian, Slovenian, and English.
- Updated the `AppProvider` to handle channel info reception, including deletion of channels and updating the UI accordingly.
- Enhanced `ChannelsProvider` to support channel removal and notify listeners.
- Modified `ConnectionProvider` to include methods for checking empty channel slots and deleting channels.
- Updated BLE service methods to handle channel deletion and verification.
- Improved the `AddChannelDialog` to differentiate between hash and private channels, including dynamic UI elements based on channel type.
- Added delete functionality for channels in the `ContactTile` widget with confirmation dialogs.
- Adjusted permission request dialog behavior to allow dismissing by tapping outside.

lib/l10n/app_localizations.dart

@@ -3723,6 +3723,18 @@ abstract class AppLocalizations {
   /// **'This secret must be shared with all team members who need access to this channel'**
   String get channelSecretHelp;
 
+  /// Information banner explaining hash and private channel types
+  ///
+  /// In en, this message translates to:
+  /// **'Hash channels (#team): Secret auto-generated from name. Same name = same channel across devices.\n\nPrivate channels: Use explicit secret. Only those with the secret can join.'**
+  String get channelTypesInfo;
+
+  /// Help text for hash channels (# prefix)
+  ///
+  /// In en, this message translates to:
+  /// **'Hash channel: Secret will be auto-generated from the channel name. Anyone using the same name will join the same channel.'**
+  String get hashChannelInfo;
+
   /// Validation error for empty channel name
   ///
   /// In en, this message translates to: