feat: add set-as-my-location from map long-press, connector and UI improvements

Add "Set as my location" option to the map long-press bottom sheet,
allowing users to set their device position directly from the map.
Includes connector, chat, contacts, and message retry service improvements.

lib/screens/map_screen.dart

@@ -1509,6 +1509,22 @@ class _MapScreenState extends State<MapScreen> {
                 );
               },
             ),
+            ListTile(
+              leading: const Icon(Icons.my_location),
+              title: Text(context.l10n.map_setAsMyLocation),
+              onTap: () async {
+                final messenger = ScaffoldMessenger.of(context);
+                final message = context.l10n.settings_locationUpdated;
+                Navigator.pop(sheetContext);
+                await connector.setNodeLocation(
+                  lat: position.latitude,
+                  lon: position.longitude,
+                );
+                await connector.refreshDeviceInfo();
+                if (!mounted) return;
+                messenger.showSnackBar(SnackBar(content: Text(message)));
+              },
+            ),
             ListTile(
               leading: const Icon(Icons.close),
               title: Text(context.l10n.common_cancel),