Workforce rotation settings and location permission handling

lib/providers/rotation_config_provider.dart

@@ -0,0 +1,51 @@
+import 'dart:convert';
+
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../models/rotation_config.dart';
+import 'supabase_provider.dart';
+
+/// Key used to store the rotation configuration in `app_settings`.
+const _settingsKey = 'rotation_config';
+
+/// Provides the current [RotationConfig] from `app_settings`.
+final rotationConfigProvider = FutureProvider<RotationConfig>((ref) async {
+  final client = ref.watch(supabaseClientProvider);
+  final row = await client
+      .from('app_settings')
+      .select()
+      .eq('key', _settingsKey)
+      .maybeSingle();
+  if (row == null) return RotationConfig();
+  final value = row['value'];
+  if (value is Map<String, dynamic>) {
+    return RotationConfig.fromJson(value);
+  }
+  if (value is String) {
+    return RotationConfig.fromJson(jsonDecode(value) as Map<String, dynamic>);
+  }
+  return RotationConfig();
+});
+
+/// Controller for persisting [RotationConfig] changes.
+final rotationConfigControllerProvider = Provider<RotationConfigController>((
+  ref,
+) {
+  final client = ref.watch(supabaseClientProvider);
+  return RotationConfigController(client, ref);
+});
+
+class RotationConfigController {
+  RotationConfigController(this._client, this._ref);
+
+  final dynamic _client;
+  final Ref _ref;
+
+  Future<void> save(RotationConfig config) async {
+    await _client.from('app_settings').upsert({
+      'key': _settingsKey,
+      'value': config.toJson(),
+    });
+    _ref.invalidate(rotationConfigProvider);
+  }
+}