Add app source and tests

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

bricks/mvvc_template/__brick__/lib/{{project}}/see/{{screen.lowerCase()}}/Connect{{screen}}.dart

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+/// The callbacks [View{{screen}}] uses to hand results back to the screen, so
+/// the ViewModel never touches widgets.
+abstract class Connect{{screen}} {
+  // void onSomethingLoaded(SomeModel data);
+}

bricks/mvvc_template/__brick__/lib/{{project}}/see/{{screen.lowerCase()}}/View{{screen}}.dart

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+import '../parent/ParentViewModel.dart';
+import 'Connect{{screen}}.dart';
+
+class View{{screen}} extends ParentViewModel {
+  Connect{{screen}} connection;
+
+  View{{screen}}(super.context, this.connection);
+
+  // Every server-bound call follows this shape: guard with canReach, show the
+  // loading overlay, hand the result back through `connection`, and route any
+  // failure to handleError.
+  //
+  // void loadSomething(ServerProfile server) async {
+  //   if (!await canReach(server, () => loadSomething(server))) return;
+  //   showLoading('Loading…');
+  //   try {
+  //     final result = await getDataManager().someCall(server);
+  //     closeLoading();
+  //     connection.onSomethingLoaded(result);
+  //   } catch (error) {
+  //     handleError(error, () => loadSomething(server), () {}, 'Retry');
+  //   }
+  // }
+}

bricks/mvvc_template/__brick__/lib/{{project}}/see/{{screen.lowerCase()}}/{{screen}}.dart

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+import 'package:flutter/cupertino.dart';
+
+import '{{screen}}State.dart';
+
+class {{screen}} extends StatefulWidget {
+  const {{screen}}({super.key});
+
+  @override
+  State<{{screen}}> createState() => {{screen}}State();
+}

bricks/mvvc_template/__brick__/lib/{{project}}/see/{{screen.lowerCase()}}/{{screen}}State.dart

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+import 'package:flutter/material.dart';
+import 'package:stacked/stacked.dart';
+
+import '../../designs/Responsive.dart';
+import 'Connect{{screen}}.dart';
+import 'View{{screen}}.dart';
+import '{{screen}}.dart';
+
+class {{screen}}State extends State<{{screen}}> implements Connect{{screen}} {
+  View{{screen}}? _model;
+
+  @override
+  Widget build(BuildContext context) {
+    return ViewModelBuilder<View{{screen}}>.reactive(
+      viewModelBuilder: () => View{{screen}}(context, this),
+      onViewModelReady: _onReady,
+      builder: (context, viewModel, child) => Scaffold(
+        body: LayoutBuilder(
+          builder: (context, constraints) => Responsive(
+            mobile: _mobileView(constraints),
+            tablet: _tabletView(constraints),
+            desktop: _desktopView(constraints),
+          ),
+        ),
+      ),
+    );
+  }
+
+  void _onReady(View{{screen}} model) {
+    _model = model;
+    // onViewModelReady fires mid-build; a synchronous setState from the
+    // first load would dirty this State while it is still being built.
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (mounted) _initiate();
+    });
+  }
+
+  /// The single entry point for whatever this screen loads on open. Kick off
+  /// every initial load from here — never inline in `onViewModelReady`.
+  Future<void> _initiate() async {
+    assert(_model != null, 'View{{screen}} should be ready before _initiate');
+    // _model?.loadSomething();
+  }
+
+  // ── named handlers ─────────────────────────────────────────────────────────
+
+  // ── Connect{{screen}} ──────────────────────────────────────────────────────
+
+  // ── layouts ────────────────────────────────────────────────────────────────
+
+  Widget _mobileView(BoxConstraints constraints) {
+    return const SizedBox();
+  }
+
+  Widget _tabletView(BoxConstraints constraints) {
+    return const SizedBox();
+  }
+
+  Widget _desktopView(BoxConstraints constraints) {
+    return const SizedBox();
+  }
+}

bricks/mvvc_template/brick.yaml

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+name: mvvc_template
+description: Generates a Peach screen as the mandatory four files — the
+  StatefulWidget shell, its State (UI + Connect implementation), the ViewModel
+  (logic, talks to the DataManager) and the Connect interface between them.
+
+version: 0.1.0+1
+
+environment:
+  mason: ^0.1.1
+
+vars:
+  project:
+    type: string
+    description: The top-level folder under lib/ (also the package name)
+    default: Peach
+    prompt: What is your project name?
+  screen:
+    type: string
+    description: The screen name in PascalCase, e.g. ServerDetail
+    default: NewScreen
+    prompt: What is your screen name?