feat: add compass button to reset map rotation to north

- Add new CompassMapPluginWidget for map north alignment control
- Position compass button at top-right of maps
- Reset rotation to 0° while maintaining center and zoom level
- Improve UX by allowing users to easily return to north orientation
- Integrate compass into both genericMap and monitoredAreas pages

lib/compassMapPlugin.dart

@@ -0,0 +1,41 @@
+import 'package:comunes_flutter/comunes_flutter.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_map/flutter_map.dart';
+
+/// Compass button widget for resetting map rotation to north
+class CompassMapPluginWidget extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return LayoutBuilder(
+        builder: (context, constraints) =>
+            Stack(fit: StackFit.expand, children: <Widget>[
+              Positioned(
+                top: 10.0,
+                right: 10.0,
+                child: new CenteredRow(
+                  children: <Widget>[
+                    new Column(
+                      children: <Widget>[
+                        _compassButton(context),
+                      ],
+                    )
+                  ],
+                ),
+              )
+            ]));
+  }
+
+  FloatingActionButton _compassButton(BuildContext context) {
+    return FloatingActionButton(
+      backgroundColor: Colors.black26,
+      mini: true,
+      heroTag: 'compass_button',
+      onPressed: () {
+        final controller = MapController.of(context);
+        // Reset rotation to 0 (north) while keeping center and zoom
+        controller.rotate(0);
+      },
+      child: Icon(Icons.explore),
+    );
+  }
+}