init: rough companion app stub

lib/features/onboarding/steps/step_admin_user.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../data/sources/localiser/realtime_data_client.dart';
+import '../../../providers.dart';
+
+class StepAdminUser extends ConsumerStatefulWidget {
+  const StepAdminUser({super.key, required this.onComplete});
+
+  final VoidCallback onComplete;
+
+  @override
+  ConsumerState<StepAdminUser> createState() => _StepAdminUserState();
+}
+
+class _StepAdminUserState extends ConsumerState<StepAdminUser> {
+  final _usernameController = TextEditingController();
+  final _passwordController = TextEditingController();
+  bool _loading = false;
+  String? _error;
+
+  @override
+  void dispose() {
+    _usernameController.dispose();
+    _passwordController.dispose();
+    super.dispose();
+  }
+
+  Future<void> _submit() async {
+    setState(() {
+      _loading = true;
+      _error = null;
+    });
+    try {
+      final username = _usernameController.text.trim();
+      final password = _passwordController.text;
+
+      final token = await ref.read(onboardingRepositoryProvider).createAdminUser(
+            username: username,
+            password: password,
+          );
+
+      ref.read(authTokenProvider.notifier).state = token;
+
+      final config = ref.read(serverConfigProvider)!;
+      final realtime = RealtimeDataClient(config: config, token: token);
+      await realtime.connect();
+      ref.read(realtimeDataClientProvider.notifier).state = realtime;
+
+      await ref
+          .read(credentialStoreProvider)
+          .save((username: username, password: password));
+
+      widget.onComplete();
+    } catch (e) {
+      setState(() => _error = e.toString());
+    } finally {
+      if (mounted) setState(() => _loading = false);
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(24),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text('Create admin account',
+              style: Theme.of(context).textTheme.titleLarge),
+          const SizedBox(height: 24),
+          TextField(
+            controller: _usernameController,
+            decoration: const InputDecoration(
+              labelText: 'Username',
+              border: OutlineInputBorder(),
+            ),
+          ),
+          const SizedBox(height: 12),
+          TextField(
+            controller: _passwordController,
+            decoration: const InputDecoration(
+              labelText: 'Password',
+              border: OutlineInputBorder(),
+            ),
+            obscureText: true,
+          ),
+          const SizedBox(height: 16),
+          if (_error != null)
+            Padding(
+              padding: const EdgeInsets.only(bottom: 12),
+              child: Text(_error!,
+                  style:
+                      TextStyle(color: Theme.of(context).colorScheme.error)),
+            ),
+          FilledButton(
+            onPressed: _loading ? null : _submit,
+            child: _loading
+                ? const SizedBox.square(
+                    dimension: 20,
+                    child: CircularProgressIndicator(strokeWidth: 2))
+                : const Text('Create account'),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/features/onboarding/steps/step_done.dart

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+import 'package:flutter/material.dart';
+
+class StepDone extends StatelessWidget {
+  const StepDone({super.key, required this.onComplete});
+
+  final VoidCallback onComplete;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(24),
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          const Icon(Icons.check_circle_outline, size: 72),
+          const SizedBox(height: 24),
+          Text(
+            'Setup complete',
+            style: Theme.of(context).textTheme.headlineSmall,
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 12),
+          const Text(
+            'Your floor plan and sensors are configured. You can add more sensors and tags at any time from the main screen.',
+            textAlign: TextAlign.center,
+          ),
+          const SizedBox(height: 32),
+          FilledButton(
+            onPressed: onComplete,
+            child: const Text('Go to floor plan'),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/features/onboarding/steps/step_floor_plan.dart

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+import 'package:flutter/material.dart';
+
+class StepFloorPlan extends StatelessWidget {
+  const StepFloorPlan({super.key, required this.onComplete});
+
+  final VoidCallback onComplete;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(24),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text('Draw floor plan',
+              style: Theme.of(context).textTheme.titleLarge),
+          const SizedBox(height: 16),
+          // TODO: embed KonvaWebView in editor mode (no live overlays).
+          //       User draws rooms, sets scale, then taps Continue.
+          const Expanded(child: Placeholder()),
+          const SizedBox(height: 16),
+          FilledButton(
+            onPressed: onComplete,
+            child: const Text('Continue'),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/features/onboarding/steps/step_sensors.dart

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+import 'package:flutter/material.dart';
+
+import '../../ble_provision/ble_provision_sheet.dart';
+
+class StepSensors extends StatelessWidget {
+  const StepSensors({super.key, required this.onComplete});
+
+  final VoidCallback onComplete;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(24),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text('Enroll sensors', style: Theme.of(context).textTheme.titleLarge),
+          const SizedBox(height: 8),
+          const Text('Add at least one sensor to continue.'),
+          const SizedBox(height: 16),
+          // TODO: list of already-enrolled sensors with placement status.
+          const Expanded(child: Placeholder()),
+          const SizedBox(height: 16),
+          OutlinedButton.icon(
+            icon: const Icon(Icons.bluetooth),
+            label: const Text('Add sensor'),
+            onPressed: () => showModalBottomSheet<void>(
+              context: context,
+              isScrollControlled: true,
+              builder: (_) => const BleProvisionSheet(),
+            ),
+          ),
+          const SizedBox(height: 12),
+          FilledButton(
+            onPressed: onComplete,
+            child: const Text('Continue'),
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/features/onboarding/steps/step_tags.dart

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+import 'package:flutter/material.dart';
+
+class StepTags extends StatelessWidget {
+  const StepTags({super.key, required this.onComplete});
+
+  final VoidCallback onComplete;
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.all(24),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          Text('Enroll tags', style: Theme.of(context).textTheme.titleLarge),
+          const SizedBox(height: 8),
+          const Text('Tags are optional here — you can enroll them later.'),
+          const SizedBox(height: 16),
+          // TODO: BLE scan list + enrolled tag list, similar to StepSensors.
+          const Expanded(child: Placeholder()),
+          const SizedBox(height: 16),
+          FilledButton(
+            onPressed: onComplete,
+            child: const Text('Continue'),
+          ),
+        ],
+      ),
+    );
+  }
+}