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/lib/src/feature/practice/model/practice.dart

@@ -142,3 +142,14 @@ const _unaccented = {
   'ý': 'y', 'ÿ': 'y', 'ß': 'ss', 'š': 's', 'ś': 's', 'ž': 'z', 'ź': 'z', //
   'ż': 'z', 'ř': 'r', 'ł': 'l', 'đ': 'd', 'ď': 'd', 'ť': 't', //
 };
+
+/// The practices for [goal] (null: every one), those made for it above those
+/// serving several: with those on top the same for every goal, a goal chosen
+/// seemed to change nothing (the developer's review, 5 Nov 2026).
+List<Practice> practicesFor(Goal? goal) {
+  if (goal == null) {
+    return practices;
+  }
+  return [...practices.where((practice) => practice.goals.contains(goal))]
+    ..sort((a, b) => a.goals.length.compareTo(b.goals.length));
+}

apps/meditate/halkyon_meditate_flutter/lib/src/tabs/explore_tab.dart

@@ -34,9 +34,8 @@ class _ExploreTabState() extends State<ExploreTab> {
     final l10n = AppLocalizations.of(context);
     final theme = Theme.of(context);
     final found = [
-      for (final practice in practices)
-        if ((_goal == null || practice.goals.contains(_goal)) &&
-            (_kind == null || practice.kind == _kind) &&
+      for (final practice in practicesFor(_goal))
+        if ((_kind == null || practice.kind == _kind) &&
             _matches(l10n, practice))
           practice,
     ];

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);
+  });
+}