🔄 Changes

Core Features
Unread Message Tracking: Added persistent unread counts for contacts and channels with visual badges
Message Deletion: Users can now long-press to delete individual messages in chats and channels
SMAZ Compression: Added per-contact compression settings (previously only channels)
UTF-8 Length Limiting: Text inputs now enforce protocol byte limits correctly
Channel Message Paths: New screen to visualize packet routing through repeater network with map view
Protocol Updates
Added maxContactMessageBytes() and maxChannelMessageBytes() helpers for message length validation
Changed channel PSK format from Base64 to Hexadecimal (breaking change)
Added app version field to connection handshake frame
UI Improvements
Unread badges on all contact and channel list items
Enhanced message bubbles with path visualization for channel messages
Character count displays in message input fields
Improved repeater CLI screen functionality
New Files
lib/storage/unread_store.dart - Unread tracking persistence
lib/storage/contact_settings_store.dart - Per-contact SMAZ settings
lib/widgets/unread_badge.dart - Unread count indicator
lib/helpers/utf8_length_limiter.dart - Byte-aware text input formatter
lib/screens/channel_message_path_screen.dart - Packet path visualization

lib/screens/repeater_settings_screen.dart

@@ -445,10 +445,10 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
       commands.add('set privacy ${_privacyMode ? "on" : "off"}');
 
       // Advertisement intervals
-      commands.add('set advert.interval ${_advertInterval}');
-      commands.add('set flood.advert.interval ${_floodAdvertInterval}');
+      commands.add('set advert.interval $_advertInterval');
+      commands.add('set flood.advert.interval $_floodAdvertInterval');
       if (_privacyMode) {
-        commands.add('set priv.advert.interval ${_privAdvertInterval}');
+        commands.add('set priv.advert.interval $_privAdvertInterval');
       }
 
       // Send all commands
@@ -661,7 +661,7 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
             ),
             const SizedBox(height: 16),
             DropdownButtonFormField<int>(
-              value: _bandwidth,
+              initialValue: _bandwidth,
               decoration: const InputDecoration(
                 labelText: 'Bandwidth',
                 border: OutlineInputBorder(),
@@ -683,7 +683,7 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
             ),
             const SizedBox(height: 16),
             DropdownButtonFormField<int>(
-              value: _spreadingFactor,
+              initialValue: _spreadingFactor,
               decoration: const InputDecoration(
                 labelText: 'Spreading Factor',
                 border: OutlineInputBorder(),
@@ -705,7 +705,7 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
             ),
             const SizedBox(height: 16),
             DropdownButtonFormField<int>(
-              value: _codingRate,
+              initialValue: _codingRate,
               decoration: const InputDecoration(
                 labelText: 'Coding Rate',
                 border: OutlineInputBorder(),
@@ -841,7 +841,7 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
             const Divider(),
             ListTile(
               title: const Text('Local Advertisement Interval'),
-              subtitle: Text('${_advertInterval} minutes'),
+              subtitle: Text('$_advertInterval minutes'),
               trailing: Text('${_advertInterval}m'),
             ),
             Slider(
@@ -860,7 +860,7 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
             const SizedBox(height: 16),
             ListTile(
               title: const Text('Flood Advertisement Interval'),
-              subtitle: Text('${_floodAdvertInterval} hours'),
+              subtitle: Text('$_floodAdvertInterval hours'),
               trailing: Text('${_floodAdvertInterval}h'),
             ),
             Slider(
@@ -880,7 +880,7 @@ class _RepeaterSettingsScreenState extends State<RepeaterSettingsScreen> {
               const SizedBox(height: 16),
               ListTile(
                 title: const Text('Encrypted Advertisement Interval'),
-                subtitle: Text('${_privAdvertInterval} minutes'),
+                subtitle: Text('$_privAdvertInterval minutes'),
                 trailing: Text('${_privAdvertInterval}m'),
               ),
               Slider(