Add advanced path management, debug logging, and fix channel sync

New features:
- In-app debug log viewer with copy/clear functionality
- Advanced path management UI with history and custom path builder
- Battery indicator widget with voltage/percentage toggle
- Contact/channel filtering and sorting improvements
- Repeater command ACK tracking with path history integration

Fixes:
- Switch channel sync from parallel to sequential to prevent timeouts
- Preserve path overrides when contacts refresh from device
- Fix ACK hash computation for SMAZ-encoded messages
- Proper cleanup of pending operations on disconnect

lib/screens/repeater_hub_screen.dart

@@ -33,11 +33,9 @@ class RepeaterHubScreen extends StatelessWidget {
       ),
       body: SafeArea(
         top: false,
-        child: Padding(
+        child: ListView(
           padding: const EdgeInsets.all(16),
-          child: Column(
-            crossAxisAlignment: CrossAxisAlignment.stretch,
-            children: [
+          children: [
               // Repeater info card
               Card(
                 child: Padding(
@@ -142,8 +140,7 @@ class RepeaterHubScreen extends StatelessWidget {
                   );
                 },
               ),
-            ],
-          ),
+          ],
         ),
       ),
     );