Initial commit: CookIT recipe collection and week planner

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/support/test_database.dart

@@ -0,0 +1,23 @@
+import 'dart:ffi';
+import 'dart:io';
+
+import 'package:cookit/src/database/database.dart';
+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+import 'package:sqlite3/open.dart';
+
+/// An in-memory database for tests, or one in [file] to test migrations. On
+/// Windows hosts the sqlite3 library comes from COOKIT_SQLITE_DLL if set,
+/// otherwise from the system's winsqlite3.dll.
+AppDatabase testDatabase({File? file}) {
+  if (Platform.isWindows) {
+    open.overrideFor(OperatingSystem.windows, () {
+      final custom = Platform.environment['COOKIT_SQLITE_DLL'];
+      return DynamicLibrary.open(custom ?? 'winsqlite3.dll');
+    });
+  }
+  driftRuntimeOptions.dontWarnAboutMultipleDatabases = true;
+  final executor = file == null ? NativeDatabase.memory() : NativeDatabase(file);
+  // Synchronous stream teardown keeps widget tests from hanging on pending timers.
+  return AppDatabase(DatabaseConnection(executor, closeStreamsSynchronously: true));
+}