fix(meditate): Explore puts what is made for a goal first

Calm down and Focus share their first two practices, so choosing between
them seemed to change nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/meditate/halkyon_meditate_flutter/test/feature/practice/practices_for_test.dart

@@ -0,0 +1,26 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_meditate_flutter/src/feature/practice/model/practice.dart';
+
+void main() {
+  test('every goal starts with what is made for it, so that choosing one '
+      "shows (the developer's review, 5 Nov 2026)", () {
+    final firsts = [for (final goal in Goal.values) practicesFor(goal).first];
+    expect(firsts.toSet().length, greaterThan(1));
+    expect(
+      practicesFor(Goal.calm).first,
+      isNot(practicesFor(Goal.focus).first),
+    );
+    expect(practicesFor(Goal.focus).first.goals, {Goal.focus});
+  });
+
+  test('a goal keeps every practice serving it; none chosen, all as they '
+      'are', () {
+    for (final goal in Goal.values) {
+      expect(
+        practicesFor(goal).toSet(),
+        practices.where((practice) => practice.goals.contains(goal)).toSet(),
+      );
+    }
+    expect(practicesFor(null), practices);
+  });
+}